reroofing analysis of k-12 building · 2017-10-11 · concept design phase - modified bitumen on...

REROOFING ANALYSISOF K-12 BUILDINGUnified School District 306Gypsum, Kansas

Reroofing Analysis of K-12 BuildingUnified School District 306Gypsum, Kansas

September 12, 2017P1711

IntroductionThis project involved exploring reasonable reroofing options for the K-12 building which includes addressing the followingissues:

x Membrane types suitable for the schoolx Adding slope to the roof to promote drainage toward the roof drainsx Addressing overflow issues to prevent ponding and structural overloadx Addressing phasing opportunities for reroofing

Existing Roof Conditions

Original Building

The roof on the original building is a two-ply modified bitumen membrane system. Very simply, modified bitumen roofmembranes are reasonably flexible and can withstand typical Kansas rooftop thermal fluctuations (exceeding 180 degrees) muchbetter than older style built-up asphalt membrane roofs.

The original building roof is in the last 15% of its 20-year expected life. However, it is not unusual that roofs in Kansas whichhave had preventive maintenance and/or unusually good weather conditions can last 5 to 15 years longer than their warranted life.This allows flexibility in reroof phasing.

The original building modified bitumen roof has some instances of granule loss and scrim exposure. However, it is substantiallybetter than many non-leaking modified bitumen roofs we have reviewed in recent years. The perimeters and penetrations areshowing evidence of normal wear and should have preventive maintenance attention to maintain moisture protection. Some fieldareas also require attention.

There are many non-standard roofing penetrations such as the anchors for railings around skylights. These non-standardpenetrations create opportunities for leaks. The previously repaired areas near roof drains are ponding water and will needinspections to remove debris blocking water flow to the drains in order to minimize ponding. Standing water is highlydetrimental to bitumen roof membranes.

Elementary Addition

The roof on the elementary addition is a four-ply built-up asphalt bitumen membrane. This is an "older" style membrane whichbecomes brittle as it ages when the asphalt polymers evaporate and harden. Additionally, this roof has a gravel surface.Although the gravel surface does protect the roof from deteriorating ultraviolet solar radiation, it creates significant difficulty inlocating roof leaks.

The elementary addition roof is one year beyond its original 20-year expected life. There have been recent leaks which wererepaired. However, due to its age and membrane type it is expected that additional leaks are likely to occur at an increasing rate.

Evaluation of Modified Bitumen and TPO Roofing Membranes

Modified Bitumen Membranes

The first of two recommended membrane systems for your roof is modified bitumen (currently on your original K-12 building).These types of membranes are an evolution of asphalt roofing. They are made from asphalt and a variety of rubber "modifiers

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and solvents." The modifiers allow the membrane to maintain greater flexibility over its life and significantly reduce thefrequency of cracks and tears which commonly occur in asphalt membrane roofs.

There are several ways of connecting pieces of this roofing material for a continuous membrane. In a heat application process thebottom side of the membrane and seams are heated with a torch to melt the modified bitumen together and create a seal. There isalso a hot-mopped application, similar to the way conventional built-up asphalt roofs are installed. Cold-applied adhesives andself-adhesive membranes are two of the more recent available options.

We typically avoid the hot-mopped applications due to the odors from asphalt kettles, the tendency to drip asphalt on the roof andwall surfaces, and the excess asphalt which flows from seams. The other options typically result in a higher quality roof and canbe installed when school is in session with minimal odors.

Thermoplastic Polyolefin (TPO) Membrane

The second recommended type of roofing membrane system is TPO. This is similar to synthetic rubber, but the seams areheat-fused (welded) with an electric hot air welder. When welded, the fused 'lap' seams create a continuous molecular bondbetween the lapped sheets and can be as strong as the rest of the membrane. TPO membranes include a mesh reinforcement layerthat provides more strength and stability.

Unlike modified bitumen membranes, a puncture or tear in the membrane can be readily located and then temporarily sealed withduct tape while waiting for a roofer to arrive and weld a permanent patch over the hole.

TPO membranes are typically available in white, beige, gray and black. White is typically used on roofs not subject to viewsbecause it is best for enhancing solar reflectivity and improve energy efficiency.

Evaluation of Overflow Drainage

Original Building Existing Overflow Drainage

The typical roof slope of the original building is 1/8" per foot (the code requirement at the time of design). Additionally, thereare no overflow drains on the original building roof. Once water ponds approximately three inches deep at a clogged roof drainwater will begin to flow to adjacent roof sections. When the water level ponds approximately six inches deep it will flow overthe edge of the building.

The typical 48-foot by 48-foot roof area served by a single roof drain could pond as much as 217 cubic feet of water (or 13,540pounds) depending on the extent of adjacent clogged drains. However, roof deflection under the water weight would likely resultin added water volume.

The kitchen area roof has a significantly higher roof edge parapet and would likely result in structural failure if all three roofdrains were simultaneously clogged during a rain event with 12 or more inches of precipitation.

Elementary Addition Existing Overflow Drainage

The typical roof slope of the elementary school addition is 1/4" per foot (complying with current building codes). Additionally,each section of roof area is served by an overflow drain. No additional overflow drains are necessary.

New Overflow Drainage

One option for improving the overflow drainage of the original building is to install new overflow drains adjacent each roofdrain. However, this is a very expensive option given the spaghetti of ductwork, electrical conduit, plumbing lines, and structurewithin the building and the need to get interior overflow drain lines to exterior walls.

Another option is to install through-wall scuppers at the building perimeter to allow ponding water to flow over the roof edgebefore it reaches an excessive depth. However, these scuppers create complicated roofing installation details and history showsthey are frequent causes of leaks.

The recommended option for your original building roof is to provide additional tapered insulation that reduces the quantity ofponded water on the roof, and directs overflow drainage to perimeter roof areas. Overflow drains would be added to theseperimeter areas. Internal piping above the ceilings would then travel the short distance to and through an exterior wall, withdownspout nozzles high on the exterior walls. Roofing membrane installation around typical roof drains is relatively simple andhas a low rate of failure.

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See the Proposed Roof Drainage diagram on the next page. The light blue zones are connected roof drainage areas. Dark bluelines are valleys between roof areas. Red dashed lines are new overflow drains extending to exterior walls.

Evaluation of Insulation Options

Tapered Insulation

When tapered insulation boards with a slope of 1/8" per foot are applied over a roof deck with an existing 1/8" per foot slope, theresult is a new roof slope of 1/4" per foot. This new slope meets current building code requirements and minimizes theopportunity of water to pond on a roof. Additionally, if a roof drain were to become clogged the increased slope results in lessaccumulated water in a roof area prior to overflow into adjacent roof areas.

A 1/8" per foot tapered insulation system will add an approximate average of 1-1/2" of insulation to the majority of the originalbuilding roof system.

Tapered insulation boards with a slope of 1/4" per foot applied over the same 1/8" per foot roof deck would achieve a basic slopeof 3/8" per foot. Besides a greater decrease in the amount of water that could pond in a roof area, the additional thicknessprovides more insulating value to the roof system, thereby increasing energy efficiency of the building.

A 1/4" per foot tapered insulation system will add an approximate average of 3" of insulation to the majority of the originalbuilding roof system.

Flat Insulation

The roofs over the elementary addition and the original building auditorium are already at 1/4" per foot. Additional taperedinsulation is not required (although it could be used). However, applying flat insulation boards to the existing sloping roof willincrease energy conservation. The efficiency increase is dependent upon the thickness of the insulation added, but with anincremental decrease in efficiency for each inch added.

Recommended Additional Insulation Thickness

The existing average insulating value of both the original and addition roof decks is R-10. The EPA recommends a value of R-38for homes in Saline County. However, there is no EPA recommendation for commercial structures. We typically recommendR-25 minimum. To achieve this will require an average additional insulation thickness of approximately three inches on theroofs.

Estimated Construction Budgets

Summary of Estimates of Probable Construction Costs

The following table outlines information found in the more detailed construction cost estimates at the end of this report.

$1,950,000$2,050,000Total

$310,000$310,0003" Average Insulation

$1,640,000$1,740,000Subtotal

$1,450,000$1,540,000Original Building$190,000$200,000Elementary Addition

TPOModified Bitumen Membrane System

Estimated Cost Summary

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1" = 50'

Roof Drainage Zone

Overflow Valley Line

New Overflow Drain

Proposed Roof Drainage

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The Ebert Mayo Design Group - Architects & Planning Consultants - Manhattan, Kansas

Estimate of Probable Construction CostConcept Design Phase - Modified Bitumen on Elementary Addition

Reroofing of Southeast of Saline K-12 BuildingGypsum, Kansas

September 12, 2017

P1711

Roof Area/Component Unit Quantity Unit Cost Extension Rnd Sub Rnd Total

Addition Reroofing

Area J Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Remove Limestone Coping Caulk LF 200 $2.00 $400 Remove Thru-Wall Flashing LF 3 $50.00 $150 Remove Wall/Parapet Flashing LF 200 $1.50 $300 Remove Downspouts LF 60 $3.50 $210 Sweep/Remove Gravel SF 2,257 $0.20 $451 Gravel Disposal SF 2,257 $0.10 $226 Roof Membrane Removal/Disposal SF 2,257 $0.95 $2,144 Roof Deck Repair SF 2,257 $0.10 $226 2-Ply Modified Bitumen Membrane SF 2,257 $2.55 $5,755 Cant Strip LF 200 $1.05 $210 Mod Bit Wall Flashing SF 380 $3.05 $1,159 Wall Anchor Bars LF 200 $1.25 $250 New Wall Counterflashing LF 200 $3.35 $670 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Install Limestone Coping Sealant LF 200 $5.00 $1,000 New Thru-Wall Flashing LF 3 $275.00 $825 New Downspouts LF 60 $7.45 $447 Miscellaneous Sealants SFR 2,257 $0.10 $226

Subtotal $10,000

Area K Protect Roof Drains EA 10 $5.00 $50 Expansion Joint Removal/Disposal LF 135 $1.00 $135 Skylight Guard Removal/Disposal EA 1 $20.00 $20 Rooftop Exhaust Fan Removal/Storage EA 1 $50.00 $50 Remove Plumbing Vent Flashing EA 1 $2.50 $3 Rooftop Exhaust Vent Removal/Storage EA 2 $25.00 $50 Remove Wall Flashing/Disposal LF 220 $1.75 $385 Remove Wall Counterflashing/Disposal LF 220 $1.00 $220 Remove Area Divider LF 35 $1.00 $35 Remove Roof Edge Flashing LF 75 $1.50 $113 Remove Large Skylight Flashing LF 40 $10.00 $400 Raise Rooftop Exhaust Fan Curb EA 1 $50.00 $50 Extend Plumbing Vent EA 3 $100.00 $300 Raise Roof Edge Flashing Curb LF 75 $10.00 $750 Raise Area Divider Curb LF 35 $10.00 $350 Sweep/Remove Gravel SF 3,000 $0.20 $600 Gravel Disposal SF 3,000 $0.10 $300 Roof Membrane Removal/Disposal SF 3,000 $0.95 $2,850

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Roof Deck Repair SF 3,000 $0.10 $300 2-Ply Modified Bitumen Membrane SF 3,000 $2.55 $7,650 Cant Strip LF 430 $1.05 $452 Mod Bit Base Flashing LF 210 $1.50 $315 Mod Bit Wall Flashing SF 220 $3.05 $671 Wall Anchor Bars LF 220 $1.25 $275 New Expansion Joint LF 135 $2.45 $331 New Wall Flashing LF 220 $3.25 $715 New Wall Counterflashing LF 220 $3.35 $737 New Plumbing Vent Flashing EA 1 $50.00 $50 New Area Divider Flashing LF 35 $2.45 $86 Rooftop Exhaust Fan Reinstallation EA 1 $600.00 $600 Rooftop Exhaust Vent Reinstallation EA 3 $50.00 $150 Install Large Skylight Flashing LF 40 $10.00 $400 Install Large Skylight Guard Rails LF 40 $150.00 $6,000 New Roof Edge Flashing LF 75 $22.00 $1,650 New Counterflashing LF 430 $3.35 $1,441 Miscellaneous Sealants SFR 3,000 $0.10 $300

Subtotal $30,000

Area L Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Remove Roof Ladder EA 1 $150.00 $150 Disconnect/Lift RTU EA 2 $7,000.00 $14,000 Remove Roof Edge Flashing LF 315 $1.50 $473 Remove Gutter LF 100 $2.50 $250 Remove Downspouts LF 80 $3.50 $280 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Raise RTU Curb EA 1 $800.00 $800 Sweep/Remove Gravel SF 10,471 $0.20 $2,094 Gravel Disposal SF 10,471 $0.10 $1,047 Roof Membrane Removal/Disposal SF 10,471 $0.95 $9,947 Roof Deck Repair SF 10,471 $0.10 $1,047 2-Ply Modified Bitumen Membrane SF 10,471 $2.55 $26,701 Cant Strip LF 300 $1.05 $315 Mod Bit Base Flashing LF 100 $1.50 $150 Mod Bit Wall Flashing SF 400 $3.05 $1,220 Reinstall RTU (Including Condensate Drain) EA 1 $1,050.00 $1,050 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 New Roof Ladder - 20' EA 1 $4,000.00 $4,000 New Roof Edge Flashing LF 315 $22.00 $6,930 New Gutter Edge Flashing LF 100 $2.00 $200 New Gutter LF 100 $18.25 $1,825 New Downspouts LF 80 $7.45 $596 Walkway Pads LF 200 $7.50 $1,500 Miscellaneous Sealants SFR 10,471 $0.10 $1,047

Subtotal $80,000

Area M Protect Roof Drains EA 12 $5.00 $60 Expansion Joint Removal/Disposal LF 165 $1.00 $165 Remove Plumbing Vent Flashing EA 1 $2.50 $3 Rooftop Exhaust Vent Removal/Storage EA 5 $25.00 $125 Remove Area Divider LF 35 $1.00 $35 Remove Roof Edge Flashing LF 70 $1.50 $105 Remove Wall/Parapet Flashing LF 60 $1.50 $90 Raise Rooftop Exhaust Vent Curb EA 5 $50.00 $250 Extend Plumbing Vent EA 1 $100.00 $100 Raise Roof Edge Flashing Curb LF 70 $10.00 $700 Raise Area Divider Curb LF 35 $10.00 $350 Sweep/Remove Gravel SF 6,625 $0.20 $1,325 Gravel Disposal SF 6,625 $0.10 $663 Roof Membrane Removal/Disposal SF 6,625 $0.95 $6,294

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Roof Deck Repair SF 6,625 $0.10 $663 2-Ply Modified Bitumen Membrane SF 6,625 $2.55 $16,894 Cant Strip LF 330 $1.05 $347 Mod Bit Base Flashing LF 270 $1.50 $405 Mod Bit Wall Flashing SF 60 $3.05 $183 Wall Anchor Bars LF 60 $1.25 $75 New Expansion Joint LF 165 $2.45 $404 New Wall Flashing LF 60 $3.25 $195 New Wall Counterflashing LF 60 $3.35 $201 New Plumbing Vent Flashing EA 1 $50.00 $50 New Area Divider Flashing LF 35 $2.45 $86 Rooftop Exhaust Vent Reinstallation EA 5 $50.00 $250 New Roof Edge Flashing LF 70 $22.00 $1,540 Walkway Pads LF 110 $7.50 $825 Miscellaneous Sealants SFR 6,625 $0.10 $663

Subtotal $30,000 $150,000

Cost to Prime Contractor Total $150,000

Prime Contractor General ConditionsSite/Project General Conditions 4.0% $6,000Overhead 4.70% $7,050Profit 4.65% $6,975Construction Inflation 2.0% $3,000Concept Design Contingency 20.0% $30,000

Subtotal 13.4% $50,000

Estimate of Probable Construction Cost $200,000

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Estimate of Probable Construction CostConcept Design Phase - Modified Bitumen on Original Building


September 12, 2017

P1711


Original Building Reroofing

Area A Protect Roof Drains EA 14 $5.00 $70 Expansion Joint Removal/Disposal LF 360 $1.00 $360 Skylight Guard Removal/Disposal EA 3 $20.00 $60 Skylight Removal/Storage EA 3 $40.00 $120 Rooftop Exhaust Fan Removal/Storage EA 7 $50.00 $350 Remove Plumbing Vent Flashing EA 5 $2.50 $13 Rooftop Exhaust Vent Removal/Storage EA 5 $25.00 $125 Remove Wall Siding/Storage LF 290 $15.00 $4,350 Remove Wall Flashing/Disposal LF 290 $1.75 $508 Remove Wall Counterflashing/Disposal LF 290 $1.00 $290 Remove Roof Edge Flashing LF 360 $1.50 $540 Remove Antenna Tower Pitch Pocket EA 1 $300.00 $300 Remove Antenna Guy Anchors EA 6 $50.00 $300 Raise Skylight Curb EA 3 $400.00 $1,200 Raise Rooftop Exhaust Fan Curb EA 7 $50.00 $350 Raise Rooftop Exhaust Vent Curb EA 5 $50.00 $250 Extend Plumbing Vent EA 5 $100.00 $500 Raise Roof Edge Flashing Curb LF 290 $10.00 $2,900 Roof Membrane Removal/Disposal SF 27,468 $0.95 $26,095 New Overflow Drain/Downspout Nozzle EA 3 $2,600.00 $7,800 Roof Deck Repair SF 27,468 $0.10 $2,747 Tapered Insulation (1/8"/ft) SF 27,468 $1.35 $37,082 Coverboard SF 27,468 $1.95 $53,563 2-Ply Modified Bitumen Membrane SF 27,468 $2.55 $70,043 Cant Strip LF 1,010 $1.05 $1,061 Mod Bit Base Flashing LF 720 $1.50 $1,080 Mod Bit Wall Flashing SF 290 $3.05 $885 Wall Anchor Bars LF 290 $1.25 $363 New Expansion Joint LF 360 $2.45 $882 New Wall Flashing LF 290 $3.25 $943 New Wall Counterflashing LF 290 $3.35 $972 Reinstall Wall Siding LF 290 $8.00 $2,320 New Plumbing Vent Flashing EA 5 $50.00 $250 Rooftop Exhaust Fan Reinstallation EA 7 $600.00 $4,200 Rooftop Exhaust Vent Reinstallation EA 5 $50.00 $250 Skylight Reinstallation EA 3 $75.00 $225 Install Antenna Guy Anchors EA 6 $100.00 $600 Install Antenna Tower Pitch Pocket EA 1 $500.00 $500 New Skylight Protection Screens EA 3 $350.00 $1,050 New Roof Edge Flashing LF 360 $22.00 $7,920 Miscellaneous Sealants SFR 27,468 $0.10 $2,747

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Subtotal $240,000

Area B Protect Roof Drains EA 12 $5.00 $60 Expansion Joint Removal/Disposal LF 320 $1.00 $320 Remove Plumbing Vent Flashing EA 12 $2.50 $30 Rooftop Exhaust Fan Removal/Storage EA 6 $50.00 $300 Rooftop Exhaust Vent Removal/Storage EA 11 $25.00 $275 Disconnect/Lift RTU EA 1 $7,000.00 $7,000 Disconnect DX Units/Storage EA 1 $1,400.00 $1,400 Remove Roof Edge Flashing LF 315 $1.50 $473 Remove Antenna Tower Pitch Pocket EA 1 $300.00 $300 Remove Antenna Guy Anchors EA 3 $50.00 $150 Raise Rooftop Exhaust Fan Curb EA 6 $50.00 $300 Raise Rooftop Exhaust Vent Curb EA 11 $50.00 $550 Extend Plumbing Vent EA 12 $100.00 $1,200 Raise RTU Curb EA 1 $800.00 $800 Raise Roof Edge Flashing Curb LF 315 $10.00 $3,150 Roof Membrane Removal/Disposal SF 23,772 $0.95 $22,583 New Overflow Drain/Downspout Nozzle EA 1 $2,600.00 $2,600 Roof Deck Repair SF 23,772 $0.10 $2,377 Tapered Insulation (1/8"/ft) SF 23,772 $1.35 $32,092 Coverboard SF 23,772 $1.95 $46,355 2-Ply Modified Bitumen Membrane SF 23,772 $2.55 $60,619 Cant Strip LF 635 $1.05 $667 Mod Bit Base Flashing LF 315 $1.50 $473 New Expansion Joint LF 320 $2.45 $784 New Plumbing Vent Flashing EA 6 $50.00 $300 Reinstall RTU (Including Condensate Drain) EA 1 $1,050.00 $1,050 Rooftop Exhaust Fan Reinstallation EA 6 $600.00 $3,600 Rooftop Exhaust Vent Reinstallation EA 11 $50.00 $550 Reconnect DX Units EA 1 $650.00 $650 Install Antenna Guy Anchors EA 3 $100.00 $300 Install Antenna Tower Pitch Pocket EA 1 $500.00 $500 New Roof Edge Flashing LF 315 $22.00 $6,930 Walkway Pads LF 70 $7.50 $525 Miscellaneous Sealants SFR 23,772 $0.10 $2,377

Subtotal $200,000

Area C Protect Roof Drains EA 6 $5.00 $30 Expansion Joint Removal/Disposal LF 410 $1.00 $410 Rooftop Exhaust Fan Removal/Storage EA 5 $50.00 $250 Remove Plumbing Vent Flashing EA 3 $2.50 $8 Rooftop Exhaust Vent Removal/Storage EA 3 $25.00 $75 Remove Roof Edge Flashing LF 125 $1.50 $188 Raise Rooftop Exhaust Fan Curb EA 5 $50.00 $250 Raise Rooftop Exhaust Vent Curb EA 3 $50.00 $150 Extend Plumbing Vent EA 3 $100.00 $300 Raise Roof Edge Flashing Curb LF 125 $10.00 $1,250 Roof Membrane Removal/Disposal SF 15,244 $0.95 $14,482 New Overflow Drain/Downspout Nozzle EA 1 $2,600.00 $2,600 Roof Deck Repair SF 15,244 $0.10 $1,524 Tapered Insulation (1/8"/ft) SF 15,244 $1.35 $20,579 Coverboard SF 15,244 $1.95 $29,726 2-Ply Modified Bitumen Membrane SF 15,244 $2.55 $38,872 Cant Strip LF 535 $1.05 $562 Mod Bit Base Flashing LF 535 $1.50 $803 New Expansion Joint LF 410 $2.45 $1,005 New Plumbing Vent Flashing EA 3 $50.00 $150 Rooftop Exhaust Fan Reinstallation EA 5 $600.00 $3,000 Rooftop Exhaust Vent Reinstallation EA 3 $50.00 $150 New Roof Edge Flashing LF 125 $22.00 $2,750

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Miscellaneous Sealants SFR 15,244 $0.10 $1,524

Subtotal $120,000

Area D Protect Roof Drains EA 10 $5.00 $50 Expansion Joint Removal/Disposal LF 585 $1.00 $585 Skylight Guard Removal/Disposal EA 4 $20.00 $80 Skylight Removal/Storage EA 4 $40.00 $160 Rooftop Exhaust Fan Removal/Storage EA 2 $50.00 $100 Remove Plumbing Vent Flashing EA 5 $2.50 $13 Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Remove Roof Edge Flashing LF 30 $1.50 $45 Remove Wall Siding/Storage LF 450 $15.00 $6,750 Remove Wall Flashing/Disposal LF 450 $1.75 $788 Remove Wall Counterflashing/Disposal LF 450 $1.00 $450 Raise Skylight Curb EA 4 $400.00 $1,600 Raise Rooftop Exhaust Fan Curb EA 2 $50.00 $100 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Raise Roof Edge Flashing Curb LF 30 $10.00 $300 Extend Plumbing Vent EA 5 $100.00 $500 Roof Membrane Removal/Disposal SF 11,761 $0.95 $11,173 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 11,761 $0.10 $1,176 Tapered Insulation (1/8"/ft) SF 11,761 $1.35 $15,877 Coverboard SF 11,761 $1.95 $22,934 2-Ply Modified Bitumen Membrane SF 11,761 $2.55 $29,991 Cant Strip LF 1,065 $1.05 $1,118 Mod Bit Base Flashing LF 615 $1.50 $923 Mod Bit Wall Flashing SF 450 $3.05 $1,373 Wall Anchor Bars LF 450 $1.25 $563 New Expansion Joint LF 585 $2.45 $1,433 New Wall Flashing LF 450 $3.25 $1,463 New Wall Counterflashing LF 450 $3.35 $1,508 Reinstall Wall Siding LF 450 $8.00 $3,600 New Plumbing Vent Flashing EA 5 $50.00 $250 Rooftop Exhaust Fan Reinstallation EA 2 $600.00 $1,200 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Skylight Reinstallation EA 4 $75.00 $300 New Skylight Protection Screens EA 4 $350.00 $1,400 Reinstall Wall Siding LF 450 $8.00 $3,600 New Counterflashing LF 450 $3.35 $1,508 New Roof Edge Flashing LF 30 $22.00 $660 Walkway Pads LF 30 $7.50 $225 Miscellaneous Sealants SFR 11,761 $0.10 $1,176

Subtotal $120,000

Area E Protect Roof Drains EA 5 $5.00 $25 Expansion Joint Removal/Disposal LF 250 $1.00 $250 Rooftop Exhaust Fan Removal/Storage EA 4 $50.00 $200 Remove Plumbing Vent Flashing EA 7 $2.50 $18 Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Ductwork Removal/Storage EA 2 $50.00 $100 Disconnect DX Units/Storage EA 2 $1,400.00 $2,800 Remove Roof Edge Flashing LF 335 $1.50 $503 Raise Rooftop Exhaust Fan Curb EA 4 $50.00 $200 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Extend Plumbing Vent EA 7 $100.00 $700 Raise Roof Edge Flashing Curb LF 335 $10.00 $3,350 Roof Membrane Removal/Disposal SF 8,710 $0.95 $8,275 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 8,710 $0.10 $871 Tapered Insulation (1/8"/ft) SF 8,710 $1.35 $11,759

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Coverboard SF 8,710 $1.95 $16,985 2-Ply Modified Bitumen Membrane SF 8,710 $2.55 $22,211 Cant Strip LF 585 $1.05 $614 Mod Bit Base Flashing LF 585 $1.50 $878 New Expansion Joint LF 250 $2.45 $613 New Plumbing Vent Flashing EA 7 $50.00 $350 Rooftop Exhaust Fan Reinstallation EA 4 $600.00 $2,400 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Ductwork Reinstallation EA 2 $100.00 $200 Ductwork Supports EA 2 $50.00 $100 Reconnect DX Units EA 2 $650.00 $1,300 New Roof Ladder - 6' EA 1 $900.00 $900 New Roof Edge Flashing LF 335 $22.00 $7,370 Walkway Pads LF 70 $7.50 $525 Miscellaneous Sealants SFR 8,710 $0.10 $871

Subtotal $90,000

Area F Protect Roof Drains EA 3 $5.00 $15 Skylight Guard Removal/Disposal EA 9 $20.00 $180 Skylight Removal/Storage EA 9 $40.00 $360 Rooftop Exhaust Fan Removal/Storage EA 7 $50.00 $350 Rooftop Kitchen Exhaust Fan Removal/Storage EA 4 $1,500.00 $6,000 Remove Plumbing Vent Flashing EA 3 $2.50 $8 Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Ductwork Removal/Storage EA 2 $50.00 $100 Remove Wall Siding/Storage LF 195 $15.00 $2,925 Remove Wall Coping/Disposal LF 195 $2.50 $488 Remove Wall Flashing/Disposal LF 195 $1.75 $341 Remove Wall Counterflashing/Disposal LF 195 $1.00 $195 Remove Coping Flashing LF 195 $2.50 $488 Remove Coping Counterflashing/Disposal LF 195 $1.00 $195 Raise Skylight Curb EA 9 $400.00 $3,600 Raise Rooftop Exhaust Fan Curb EA 7 $50.00 $350 Raise Rooftop Kitchen Exhaust Fan Curb EA 4 $100.00 $400 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Extend Plumbing Vent EA 3 $100.00 $300 Roof Membrane Removal/Disposal SF 6,785 $0.95 $6,446 New Overflow Drain/Downspout Nozzle EA 1 $2,600.00 $2,600 Roof Deck Repair SF 6,785 $0.10 $679 Tapered Insulation (1/8"/ft) SF 6,785 $1.35 $9,160 Coverboard SF 6,785 $1.95 $13,231 2-Ply Modified Bitumen Membrane SF 6,785 $2.55 $17,302 Cant Strip LF 390 $1.05 $410 Mod Bit Wall Flashing SF 585 $3.05 $1,784 Wall Anchor Bars LF 390 $1.25 $488 New Wall Flashing LF 195 $3.25 $634 New Wall Counterflashing LF 195 $3.35 $653 Reinstall Wall Siding LF 195 $8.00 $1,560 New Plumbing Vent Flashing EA 3 $50.00 $150 Rooftop Exhaust Fan Reinstallation EA 7 $600.00 $4,200 Rooftop Kitchen Exhaust Fan Reinstallation EA 4 $2,500.00 $10,000 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Skylight Reinstallation EA 9 $75.00 $675 Ductwork Reinstallation EA 2 $100.00 $200 Ductwork Supports EA 2 $50.00 $100 New Skylight Protection Screens EA 9 $350.00 $3,150 New Wall Coping LF 195 $32.00 $6,240 New Wall Coping Flashing LF 195 $3.00 $585 Walkway Pads LF 140 $7.50 $1,050 Miscellaneous Sealants SFR 6,785 $0.10 $679

Subtotal $100,000

- 11 -


Area G Protect Roof Drains EA 4 $5.00 $20 Remove Roof Ladder EA 1 $150.00 $150 Disconnect/Lift RTU EA 2 $7,000.00 $14,000 Remove Wall Siding/Storage LF 110 $15.00 $1,650 Remove Wall Flashing/Disposal LF 110 $1.75 $193 Remove Wall Counterflashing/Disposal LF 110 $1.00 $110 Remove Roof Edge Flashing LF 300 $1.50 $450 Raise RTU Curb EA 2 $800.00 $1,600 Raise Roof Edge Flashing Curb LF 300 $10.00 $3,000 Roof Membrane Removal/Disposal SF 10,525 $0.95 $9,999 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 10,525 $0.10 $1,053 Tapered Insulation (1/8"/ft) SF 10,525 $1.35 $14,209 Coverboard SF 10,525 $1.95 $20,524 2-Ply Modified Bitumen Membrane SF 10,525 $2.55 $26,839 Cant Strip LF 410 $1.05 $431 Mod Bit Base Flashing LF 300 $1.50 $450 Mod Bit Wall Flashing SF 110 $3.05 $336 Wall Anchor Bars LF 110 $1.25 $138 New Wall Flashing LF 110 $3.25 $358 New Wall Counterflashing LF 110 $3.35 $369 Reinstall Wall Siding LF 110 $8.00 $880 Reinstall RTU (Including Condensate Drain) EA 2 $1,050.00 $2,100 New Roof Ladder - 9' EA 1 $1,350.00 $1,350 New Roof Edge Flashing LF 300 $22.00 $6,600 Walkway Pads LF 140 $7.50 $1,050 Miscellaneous Sealants SFR 10,525 $0.10 $1,053

Subtotal $110,000

Area H Protect Roof Drains EA 4 $5.00 $20 Skylight Guard Removal/Disposal EA 8 $20.00 $160 Skylight Removal/Storage EA 8 $40.00 $320 Rooftop Exhaust Fan Removal/Storage EA 1 $50.00 $50 Remove Roof Ladder EA 1 $150.00 $150 Remove Roof Edge Flashing LF 360 $1.50 $540 Raise Skylight Curb EA 8 $400.00 $3,200 Raise Rooftop Exhaust Fan Curb EA 1 $50.00 $50 Raise Roof Edge Flashing Curb LF 360 $10.00 $3,600 Roof Membrane Removal/Disposal SF 10,525 $0.95 $9,999 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 10,525 $0.10 $1,053 Tapered Insulation (1/8"/ft) SF 10,525 $1.35 $14,209 Coverboard SF 10,525 $1.95 $20,524 2-Ply Modified Bitumen Membrane SF 10,525 $2.55 $26,839 Cant Strip LF 360 $1.05 $378 Mod Bit Base Flashing LF 360 $1.50 $540 Rooftop Exhaust Fan Reinstallation EA 1 $600.00 $600 Skylight Reinstallation EA 8 $75.00 $600 New Skylight Protection Screens EA 8 $350.00 $2,800 New Roof Ladder - 16' EA 1 $3,200.00 $3,200 New Roof Edge Flashing LF 360 $22.00 $7,920 Miscellaneous Sealants SFR 10,525 $0.10 $1,053

Subtotal $100,000

Area I Protect Roof Drains EA 2 $5.00 $10 Disconnect/Lift RTU EA 1 $7,000.00 $7,000 Remove Roof Edge Flashing LF 350 $1.50 $525 Rooftop Exhaust Vent Removal/Storage EA 2 $25.00 $50 Raise Rooftop Exhaust Vent Curb EA 2 $50.00 $100 Raise RTU Curb EA 1 $800.00 $800

- 12 -


Raise Roof Edge Flashing Curb LF 350 $10.00 $3,500 Roof Membrane Removal/Disposal SF 6,175 $0.95 $5,866 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 6,175 $0.10 $618 2-Ply Modified Bitumen Membrane SF 6,175 $2.55 $15,746 Cant Strip LF 350 $1.05 $368 Mod Bit Base Flashing LF 350 $1.50 $525 Reinstall RTU (Including Condensate Drain) EA 1 $1,050.00 $1,050 Rooftop Exhaust Vent Reinstallation EA 2 $50.00 $100 New Roof Edge Flashing LF 350 $22.00 $7,700 New Roof Ladder - 20' EA 1 $4,000.00 $4,000 Walkway Pads LF 100 $7.50 $750 Miscellaneous Sealants SFR 6,175 $0.10 $618

Subtotal $50,000 $1,140,000

Cost to Prime Contractor Total $1,140,000


Subtotal 13.4% $400,000

Estimate of Probable Construction Cost $1,540,000

- 13 -


Estimate of Probable Construction CostConcept Design Phase - TPO on Elementary Addition


September 12, 2017

P1711


Addition Reroofing

Area J Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Remove Limestone Coping Caulk LF 200 $2.00 $400 Remove Thru-Wall Flashing LF 3 $50.00 $150 Remove Wall/Parapet Flashing LF 200 $1.50 $300 Remove Downspouts LF 60 $3.50 $210 Sweep/Remove Gravel SF 2,257 $0.20 $451 Gravel Disposal SF 2,257 $0.10 $226 Roof Membrane Removal/Disposal SF 2,257 $0.95 $2,144 Roof Deck Repair SF 2,257 $0.10 $226 60 Mil Fleece-Back TPO Membrane SF 2,257 $2.05 $4,627 TPO Wall Flashing SF 380 $2.80 $1,064 Wall Anchor Bars LF 200 $1.25 $250 New Wall Counterflashing LF 200 $3.35 $670 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Install Limestone Coping Sealant LF 200 $5.00 $1,000 New Thru-Wall Flashing LF 3 $275.00 $825 New Downspouts LF 60 $7.45 $447 Miscellaneous Sealants SFR 2,257 $0.10 $226

Subtotal $10,000

Area K Protect Roof Drains EA 10 $5.00 $50 Expansion Joint Removal/Disposal LF 135 $1.00 $135 Skylight Guard Removal/Disposal EA 1 $20.00 $20 Rooftop Exhaust Fan Removal/Storage EA 1 $50.00 $50 Remove Plumbing Vent Flashing EA 1 $2.50 $3 Rooftop Exhaust Vent Removal/Storage EA 2 $25.00 $50 Remove Wall Flashing/Disposal LF 220 $1.75 $385 Remove Wall Counterflashing/Disposal LF 220 $1.00 $220 Remove Area Divider LF 35 $1.00 $35 Remove Roof Edge Flashing LF 75 $1.50 $113 Remove Large Skylight Flashing LF 40 $10.00 $400 Raise Rooftop Exhaust Fan Curb EA 1 $50.00 $50 Extend Plumbing Vent EA 3 $100.00 $300 Raise Roof Edge Flashing Curb LF 75 $10.00 $750 Raise Area Divider Curb LF 35 $10.00 $350 Sweep/Remove Gravel SF 3,000 $0.20 $600 Gravel Disposal SF 3,000 $0.10 $300 Roof Membrane Removal/Disposal SF 3,000 $0.95 $2,850 Roof Deck Repair SF 3,000 $0.10 $300

- 14 -


60 Mil Fleece-Back TPO Membrane SF 3,000 $2.05 $6,150 TPO Base Flashing LF 210 $1.50 $315 TPO Wall Flashing SF 220 $2.80 $616 Wall Anchor Bars LF 220 $1.25 $275 New Expansion Joint LF 135 $2.45 $331 New Wall Flashing LF 220 $3.25 $715 New Wall Counterflashing LF 220 $3.35 $737 New Plumbing Vent Flashing EA 1 $50.00 $50 New Area Divider Flashing LF 35 $2.45 $86 Rooftop Exhaust Fan Reinstallation EA 1 $600.00 $600 Rooftop Exhaust Vent Reinstallation EA 3 $50.00 $150 Install Large Skylight Flashing LF 40 $10.00 $400 Install Large Skylight Guard Rails LF 40 $150.00 $6,000 New Roof Edge Flashing LF 75 $22.00 $1,650 New Counterflashing LF 430 $3.35 $1,441 Miscellaneous Sealants SFR 3,000 $0.10 $300

Subtotal $30,000

Area L Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Remove Roof Ladder EA 1 $150.00 $150 Disconnect/Lift RTU EA 2 $7,000.00 $14,000 Remove Roof Edge Flashing LF 315 $1.50 $473 Remove Gutter LF 100 $2.50 $250 Remove Downspouts LF 80 $3.50 $280 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Raise RTU Curb EA 1 $800.00 $800 Sweep/Remove Gravel SF 10,471 $0.20 $2,094 Gravel Disposal SF 10,471 $0.10 $1,047 Roof Membrane Removal/Disposal SF 10,471 $0.95 $9,947 Roof Deck Repair SF 10,471 $0.10 $1,047 60 Mil Fleece-Back TPO Membrane SF 10,471 $2.05 $21,466 TPO Base Flashing LF 100 $1.50 $150 TPO Wall Flashing SF 400 $2.80 $1,120 Reinstall RTU (Including Condensate Drain) EA 1 $1,050.00 $1,050 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 New Roof Ladder - 20' EA 1 $4,000.00 $4,000 New Roof Edge Flashing LF 315 $22.00 $6,930 New Gutter Edge Flashing LF 100 $2.00 $200 New Gutter LF 100 $18.25 $1,825 New Downspouts LF 80 $7.45 $596 Walkway Pads LF 200 $7.50 $1,500 Miscellaneous Sealants SFR 10,471 $0.10 $1,047

Subtotal $70,000

Area M Protect Roof Drains EA 12 $5.00 $60 Expansion Joint Removal/Disposal LF 165 $1.00 $165 Remove Plumbing Vent Flashing EA 1 $2.50 $3 Rooftop Exhaust Vent Removal/Storage EA 5 $25.00 $125 Remove Area Divider LF 35 $1.00 $35 Remove Roof Edge Flashing LF 70 $1.50 $105 Remove Wall/Parapet Flashing LF 60 $1.50 $90 Raise Rooftop Exhaust Vent Curb EA 5 $50.00 $250 Extend Plumbing Vent EA 1 $100.00 $100 Raise Roof Edge Flashing Curb LF 70 $10.00 $700 Raise Area Divider Curb LF 35 $10.00 $350 Sweep/Remove Gravel SF 6,625 $0.20 $1,325 Gravel Disposal SF 6,625 $0.10 $663 Roof Membrane Removal/Disposal SF 6,625 $0.95 $6,294 Roof Deck Repair SF 6,625 $0.10 $663 60 Mil Fleece-Back TPO Membrane SF 6,625 $2.05 $13,581 TPO Base Flashing LF 270 $1.50 $405

- 15 -


TPO Wall Flashing SF 60 $2.80 $168 Wall Anchor Bars LF 60 $1.25 $75 New Expansion Joint LF 165 $2.45 $404 New Wall Flashing LF 60 $3.25 $195 New Wall Counterflashing LF 60 $3.35 $201 New Plumbing Vent Flashing EA 1 $50.00 $50 New Area Divider Flashing LF 35 $2.45 $86 Rooftop Exhaust Vent Reinstallation EA 5 $50.00 $250 New Roof Edge Flashing LF 70 $22.00 $1,540 Walkway Pads LF 110 $7.50 $825 Miscellaneous Sealants SFR 6,625 $0.10 $663

Subtotal $30,000 $140,000



Subtotal 13.4% $50,000


- 16 -


Estimate of Probable Construction CostConcept Design Phase - TPO on Original Building


September 12, 2017

P1711



Area A Protect Roof Drains EA 14 $5.00 $70 Expansion Joint Removal/Disposal LF 360 $1.00 $360 Skylight Guard Removal/Disposal EA 3 $20.00 $60 Skylight Removal/Storage EA 3 $40.00 $120 Rooftop Exhaust Fan Removal/Storage EA 7 $50.00 $350 Remove Plumbing Vent Flashing EA 5 $2.50 $13 Rooftop Exhaust Vent Removal/Storage EA 5 $25.00 $125 Remove Wall Siding/Storage LF 290 $15.00 $4,350 Remove Wall Flashing/Disposal LF 290 $1.75 $508 Remove Wall Counterflashing/Disposal LF 290 $1.00 $290 Remove Roof Edge Flashing LF 360 $1.50 $540 Remove Antenna Tower Pitch Pocket EA 1 $300.00 $300 Remove Antenna Guy Anchors EA 6 $50.00 $300 Raise Skylight Curb EA 3 $400.00 $1,200 Raise Rooftop Exhaust Fan Curb EA 7 $50.00 $350 Raise Rooftop Exhaust Vent Curb EA 5 $50.00 $250 Extend Plumbing Vent EA 5 $100.00 $500 Raise Roof Edge Flashing Curb LF 290 $10.00 $2,900 Roof Membrane Removal/Disposal SF 27,468 $0.95 $26,095 New Overflow Drain/Downspout Nozzle EA 3 $2,600.00 $7,800 Roof Deck Repair SF 27,468 $0.10 $2,747 Tapered Insulation (1/8"/ft) SF 27,468 $1.35 $37,082 Coverboard SF 27,468 $1.95 $53,563 60 Mil Fleece-Back TPO Membrane SF 27,468 $2.05 $56,309 TPO Base Flashing LF 720 $1.50 $1,080 TPO Wall Flashing SF 290 $2.80 $812 Wall Anchor Bars LF 290 $1.25 $363 New Expansion Joint LF 360 $2.45 $882 New Wall Flashing LF 290 $3.25 $943 New Wall Counterflashing LF 290 $3.35 $972 Reinstall Wall Siding LF 290 $8.00 $2,320 New Plumbing Vent Flashing EA 5 $50.00 $250 Rooftop Exhaust Fan Reinstallation EA 7 $600.00 $4,200 Rooftop Exhaust Vent Reinstallation EA 5 $50.00 $250 Skylight Reinstallation EA 3 $75.00 $225 Install Antenna Guy Anchors EA 6 $100.00 $600 Install Antenna Tower Pitch Pocket EA 1 $500.00 $500 New Skylight Protection Screens EA 3 $350.00 $1,050 New Roof Edge Flashing LF 360 $22.00 $7,920 Miscellaneous Sealants SFR 27,468 $0.10 $2,747

- 17 -


Subtotal $220,000

Area B Protect Roof Drains EA 12 $5.00 $60 Expansion Joint Removal/Disposal LF 320 $1.00 $320 Remove Plumbing Vent Flashing EA 12 $2.50 $30 Rooftop Exhaust Fan Removal/Storage EA 6 $50.00 $300 Rooftop Exhaust Vent Removal/Storage EA 11 $25.00 $275 Disconnect/Lift RTU EA 1 $7,000.00 $7,000 Disconnect DX Units/Storage EA 1 $1,400.00 $1,400 Remove Roof Edge Flashing LF 315 $1.50 $473 Remove Antenna Tower Pitch Pocket EA 1 $300.00 $300 Remove Antenna Guy Anchors EA 3 $50.00 $150 Raise Rooftop Exhaust Fan Curb EA 6 $50.00 $300 Raise Rooftop Exhaust Vent Curb EA 11 $50.00 $550 Extend Plumbing Vent EA 12 $100.00 $1,200 Raise RTU Curb EA 1 $800.00 $800 Raise Roof Edge Flashing Curb LF 315 $10.00 $3,150 Roof Membrane Removal/Disposal SF 23,772 $0.95 $22,583 New Overflow Drain/Downspout Nozzle EA 1 $2,600.00 $2,600 Roof Deck Repair SF 23,772 $0.10 $2,377 Tapered Insulation (1/8"/ft) SF 23,772 $1.35 $32,092 Coverboard SF 23,772 $1.95 $46,355 60 Mil Fleece-Back TPO Membrane SF 23,772 $2.05 $48,733 TPO Base Flashing LF 635 $1.50 $953 New Expansion Joint LF 320 $2.45 $784 New Plumbing Vent Flashing EA 6 $50.00 $300 Reinstall RTU (Including Condensate Drain) EA 1 $1,050.00 $1,050 Rooftop Exhaust Fan Reinstallation EA 6 $600.00 $3,600 Rooftop Exhaust Vent Reinstallation EA 11 $50.00 $550 Reconnect DX Units EA 1 $650.00 $650 Install Antenna Guy Anchors EA 3 $100.00 $300 Install Antenna Tower Pitch Pocket EA 1 $500.00 $500 New Roof Edge Flashing LF 315 $22.00 $6,930 Walkway Pads LF 70 $7.50 $525 Miscellaneous Sealants SFR 23,772 $0.10 $2,377

Subtotal $190,000

Area C Protect Roof Drains EA 6 $5.00 $30 Expansion Joint Removal/Disposal LF 410 $1.00 $410 Rooftop Exhaust Fan Removal/Storage EA 5 $50.00 $250 Remove Plumbing Vent Flashing EA 3 $2.50 $8 Rooftop Exhaust Vent Removal/Storage EA 3 $25.00 $75 Remove Roof Edge Flashing LF 125 $1.50 $188 Raise Rooftop Exhaust Fan Curb EA 5 $50.00 $250 Raise Rooftop Exhaust Vent Curb EA 3 $50.00 $150 Extend Plumbing Vent EA 3 $100.00 $300 Raise Roof Edge Flashing Curb LF 125 $10.00 $1,250 Roof Membrane Removal/Disposal SF 15,244 $0.95 $14,482 New Overflow Drain/Downspout Nozzle EA 1 $2,600.00 $2,600 Roof Deck Repair SF 15,244 $0.10 $1,524 Tapered Insulation (1/8"/ft) SF 15,244 $1.35 $20,579 Coverboard SF 15,244 $1.95 $29,726 60 Mil Fleece-Back TPO Membrane SF 15,244 $2.05 $31,250 TPO Base Flashing LF 535 $1.50 $803 New Expansion Joint LF 410 $2.45 $1,005 New Plumbing Vent Flashing EA 3 $50.00 $150 Rooftop Exhaust Fan Reinstallation EA 5 $600.00 $3,000 Rooftop Exhaust Vent Reinstallation EA 3 $50.00 $150 New Roof Edge Flashing LF 125 $22.00 $2,750 Miscellaneous Sealants SFR 15,244 $0.10 $1,524

Subtotal $110,000

- 18 -


Area D Protect Roof Drains EA 10 $5.00 $50 Expansion Joint Removal/Disposal LF 585 $1.00 $585 Skylight Guard Removal/Disposal EA 4 $20.00 $80 Skylight Removal/Storage EA 4 $40.00 $160 Rooftop Exhaust Fan Removal/Storage EA 2 $50.00 $100 Remove Plumbing Vent Flashing EA 5 $2.50 $13 Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Remove Roof Edge Flashing LF 30 $1.50 $45 Remove Wall Siding/Storage LF 450 $15.00 $6,750 Remove Wall Flashing/Disposal LF 450 $1.75 $788 Remove Wall Counterflashing/Disposal LF 450 $1.00 $450 Raise Skylight Curb EA 4 $400.00 $1,600 Raise Rooftop Exhaust Fan Curb EA 2 $50.00 $100 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Raise Roof Edge Flashing Curb LF 30 $10.00 $300 Extend Plumbing Vent EA 5 $100.00 $500 Roof Membrane Removal/Disposal SF 11,761 $0.95 $11,173 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 11,761 $0.10 $1,176 Tapered Insulation (1/8"/ft) SF 11,761 $1.35 $15,877 Coverboard SF 11,761 $1.95 $22,934 60 Mil Fleece-Back TPO Membrane SF 11,761 $2.05 $24,110 TPO Base Flashing LF 615 $1.50 $923 TPO Wall Flashing SF 450 $2.80 $1,260 Wall Anchor Bars LF 450 $1.25 $563 New Expansion Joint LF 585 $2.45 $1,433 New Wall Flashing LF 450 $3.25 $1,463 New Wall Counterflashing LF 450 $3.35 $1,508 Reinstall Wall Siding LF 450 $8.00 $3,600 New Plumbing Vent Flashing EA 5 $50.00 $250 Rooftop Exhaust Fan Reinstallation EA 2 $600.00 $1,200 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Skylight Reinstallation EA 4 $75.00 $300 New Skylight Protection Screens EA 4 $350.00 $1,400 Reinstall Wall Siding LF 450 $8.00 $3,600 New Counterflashing LF 450 $3.35 $1,508 New Roof Edge Flashing LF 30 $22.00 $660 Walkway Pads LF 30 $7.50 $225 Miscellaneous Sealants SFR 11,761 $0.10 $1,176

Subtotal $110,000

Area E Protect Roof Drains EA 5 $5.00 $25 Expansion Joint Removal/Disposal LF 250 $1.00 $250 Rooftop Exhaust Fan Removal/Storage EA 4 $50.00 $200 Remove Plumbing Vent Flashing EA 7 $2.50 $18 Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Ductwork Removal/Storage EA 2 $50.00 $100 Disconnect DX Units/Storage EA 2 $1,400.00 $2,800 Remove Roof Edge Flashing LF 335 $1.50 $503 Raise Rooftop Exhaust Fan Curb EA 4 $50.00 $200 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Extend Plumbing Vent EA 7 $100.00 $700 Raise Roof Edge Flashing Curb LF 335 $10.00 $3,350 Roof Membrane Removal/Disposal SF 8,710 $0.95 $8,275 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 8,710 $0.10 $871 Tapered Insulation (1/8"/ft) SF 8,710 $1.35 $11,759 Coverboard SF 8,710 $1.95 $16,985 60 Mil Fleece-Back TPO Membrane SF 8,710 $2.05 $17,856 TPO Base Flashing LF 585 $1.50 $878

- 19 -


New Expansion Joint LF 250 $2.45 $613 New Plumbing Vent Flashing EA 7 $50.00 $350 Rooftop Exhaust Fan Reinstallation EA 4 $600.00 $2,400 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Ductwork Reinstallation EA 2 $100.00 $200 Ductwork Supports EA 2 $50.00 $100 Reconnect DX Units EA 2 $650.00 $1,300 New Roof Ladder - 6' EA 1 $900.00 $900 New Roof Edge Flashing LF 335 $22.00 $7,370 Walkway Pads LF 70 $7.50 $525 Miscellaneous Sealants SFR 8,710 $0.10 $871

Subtotal $80,000

Area F Protect Roof Drains EA 3 $5.00 $15 Skylight Guard Removal/Disposal EA 9 $20.00 $180 Skylight Removal/Storage EA 9 $40.00 $360 Rooftop Exhaust Fan Removal/Storage EA 7 $50.00 $350 Rooftop Kitchen Exhaust Fan Removal/Storage EA 4 $1,500.00 $6,000 Remove Plumbing Vent Flashing EA 3 $2.50 $8 Rooftop Exhaust Vent Removal/Storage EA 1 $25.00 $25 Ductwork Removal/Storage EA 2 $50.00 $100 Remove Wall Siding/Storage LF 195 $15.00 $2,925 Remove Wall Coping/Disposal LF 195 $2.50 $488 Remove Wall Flashing/Disposal LF 195 $1.75 $341 Remove Wall Counterflashing/Disposal LF 195 $1.00 $195 Remove Coping Flashing LF 195 $2.50 $488 Remove Coping Counterflashing/Disposal LF 195 $1.00 $195 Raise Skylight Curb EA 9 $400.00 $3,600 Raise Rooftop Exhaust Fan Curb EA 7 $50.00 $350 Raise Rooftop Kitchen Exhaust Fan Curb EA 4 $100.00 $400 Raise Rooftop Exhaust Vent Curb EA 1 $50.00 $50 Extend Plumbing Vent EA 3 $100.00 $300 Roof Membrane Removal/Disposal SF 6,785 $0.95 $6,446 New Overflow Drain/Downspout Nozzle EA 1 $2,600.00 $2,600 Roof Deck Repair SF 6,785 $0.10 $679 Tapered Insulation (1/8"/ft) SF 6,785 $1.35 $9,160 Coverboard SF 6,785 $1.95 $13,231 60 Mil Fleece-Back TPO Membrane SF 6,785 $2.05 $13,909 TPO Wall Flashing SF 585 $2.80 $1,638 Wall Anchor Bars LF 390 $1.25 $488 New Wall Flashing LF 195 $3.25 $634 New Wall Counterflashing LF 195 $3.35 $653 Reinstall Wall Siding LF 195 $8.00 $1,560 New Plumbing Vent Flashing EA 3 $50.00 $150 Rooftop Exhaust Fan Reinstallation EA 7 $600.00 $4,200 Rooftop Kitchen Exhaust Fan Reinstallation EA 4 $2,500.00 $10,000 Rooftop Exhaust Vent Reinstallation EA 1 $50.00 $50 Skylight Reinstallation EA 9 $75.00 $675 Ductwork Reinstallation EA 2 $100.00 $200 Ductwork Supports EA 2 $50.00 $100 New Skylight Protection Screens EA 9 $350.00 $3,150 New Wall Coping LF 195 $32.00 $6,240 New Wall Coping Flashing LF 195 $3.00 $585 Walkway Pads LF 140 $7.50 $1,050 Miscellaneous Sealants SFR 6,785 $0.10 $679

Subtotal $90,000

Area G Protect Roof Drains EA 4 $5.00 $20 Remove Roof Ladder EA 1 $150.00 $150 Disconnect/Lift RTU EA 2 $7,000.00 $14,000 Remove Wall Siding/Storage LF 110 $15.00 $1,650

- 20 -


Remove Wall Flashing/Disposal LF 110 $1.75 $193 Remove Wall Counterflashing/Disposal LF 110 $1.00 $110 Remove Roof Edge Flashing LF 300 $1.50 $450 Raise RTU Curb EA 2 $800.00 $1,600 Raise Roof Edge Flashing Curb LF 300 $10.00 $3,000 Roof Membrane Removal/Disposal SF 10,525 $0.95 $9,999 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 10,525 $0.10 $1,053 Tapered Insulation (1/8"/ft) SF 10,525 $1.35 $14,209 Coverboard SF 10,525 $1.95 $20,524 60 Mil Fleece-Back TPO Membrane SF 10,525 $2.05 $21,576 TPO Base Flashing LF 300 $1.50 $450 TPO Wall Flashing SF 110 $2.80 $308 Wall Anchor Bars LF 110 $1.25 $138 New Wall Flashing LF 110 $3.25 $358 New Wall Counterflashing LF 110 $3.35 $369 Reinstall Wall Siding LF 110 $8.00 $880 Reinstall RTU (Including Condensate Drain) EA 2 $1,050.00 $2,100 New Roof Ladder - 9' EA 1 $1,350.00 $1,350 New Roof Edge Flashing LF 300 $22.00 $6,600 Walkway Pads LF 140 $7.50 $1,050 Miscellaneous Sealants SFR 10,525 $0.10 $1,053

Subtotal $110,000

Area H Protect Roof Drains EA 4 $5.00 $20 Skylight Guard Removal/Disposal EA 8 $20.00 $160 Skylight Removal/Storage EA 8 $40.00 $320 Rooftop Exhaust Fan Removal/Storage EA 1 $50.00 $50 Remove Roof Ladder EA 1 $150.00 $150 Remove Roof Edge Flashing LF 360 $1.50 $540 Raise Skylight Curb EA 8 $400.00 $3,200 Raise Rooftop Exhaust Fan Curb EA 1 $50.00 $50 Raise Roof Edge Flashing Curb LF 360 $10.00 $3,600 Roof Membrane Removal/Disposal SF 10,525 $0.95 $9,999 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 10,525 $0.10 $1,053 Tapered Insulation (1/8"/ft) SF 10,525 $1.35 $14,209 Coverboard SF 10,525 $1.95 $20,524 60 Mil Fleece-Back TPO Membrane SF 10,525 $2.05 $21,576 TPO Base Flashing LF 360 $1.50 $540 Rooftop Exhaust Fan Reinstallation EA 1 $600.00 $600 Skylight Reinstallation EA 8 $75.00 $600 New Skylight Protection Screens EA 8 $350.00 $2,800 New Roof Ladder - 16' EA 1 $3,200.00 $3,200 New Roof Edge Flashing LF 360 $22.00 $7,920 Miscellaneous Sealants SFR 10,525 $0.10 $1,053

Subtotal $100,000

Area I Protect Roof Drains EA 2 $5.00 $10 Disconnect/Lift RTU EA 1 $7,000.00 $7,000 Remove Roof Edge Flashing LF 350 $1.50 $525 Rooftop Exhaust Vent Removal/Storage EA 2 $25.00 $50 Raise Rooftop Exhaust Vent Curb EA 2 $50.00 $100 Raise RTU Curb EA 1 $800.00 $800 Raise Roof Edge Flashing Curb LF 350 $10.00 $3,500 Roof Membrane Removal/Disposal SF 6,175 $0.95 $5,866 New Overflow Drain/Downspout Nozzle EA 2 $2,600.00 $5,200 Roof Deck Repair SF 6,175 $0.10 $618 60 Mil Fleece-Back TPO Membrane SF 6,175 $2.05 $12,659 TPO Base Flashing LF 350 $1.50 $525 Reinstall RTU (Including Condensate Drain) EA 1 $1,050.00 $1,050

- 21 -


Rooftop Exhaust Vent Reinstallation EA 2 $50.00 $100 New Roof Edge Flashing LF 350 $22.00 $7,700 New Roof Ladder - 20' EA 1 $4,000.00 $4,000 Walkway Pads LF 100 $7.50 $750 Miscellaneous Sealants SFR 6,175 $0.10 $618

Subtotal $50,000 $1,070,000

Cost to Prime Contractor Total $1,070,000


Subtotal 13.4% $380,000

Estimate of Probable Construction Cost $1,450,000

- 22 -


Estimate of Probable Construction CostConcept Design Phase - Incremental for 3" Average Insulation


September 12, 2017

P1711


Addition Reroofing

Area J Flat Insulation (3") SF 2,257 $1.60 $3,611 Coverboard SF 2,257 $1.95 $4,401

Subtotal $10,000

Area K Flat Insulation (3") SF 3,000 $1.60 $4,800 Coverboard SF 3,000 $1.95 $5,850

Subtotal $10,000

Area L Flat Insulation (3") SF 10,471 $1.60 $16,754 Coverboard SF 10,471 $1.95 $20,418

Subtotal $40,000

Area M Flat Insulation (3") SF 6,625 $1.60 $10,600 Coverboard SF 6,625 $1.95 $12,919

Subtotal $20,000 $80,000


Area A Tapered Insulation (1/8"/ft) SF 27,468 ($1.35) ($37,082) Tapered Insulation (1/4"/ft) SF 27,468 $2.50 $68,670

Subtotal $30,000

Area B Tapered Insulation (1/8"/ft) SF 23,772 ($1.35) ($32,092) Tapered Insulation (1/4"/ft) SF 23,772 $2.50 $59,430

Subtotal $30,000

Area C Tapered Insulation (1/8"/ft) SF 15,244 ($1.35) ($20,579) Tapered Insulation (1/4"/ft) SF 15,244 $2.50 $38,110

Subtotal $20,000

Area D Tapered Insulation (1/8"/ft) SF 11,761 ($1.35) ($15,877)

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Tapered Insulation (1/4"/ft) SF 11,761 $2.50 $29,403

Subtotal $10,000

Area E Tapered Insulation (1/8"/ft) SF 8,710 ($1.35) ($11,759) Tapered Insulation (1/4"/ft) SF 8,710 $2.50 $21,775

Subtotal $10,000

Area F Tapered Insulation (1/8"/ft) SF 6,785 ($1.35) ($9,160) Tapered Insulation (1/4"/ft) SF 6,785 $2.50 $16,963

Subtotal $10,000

Area G Tapered Insulation (1/8"/ft) SF 10,525 ($1.35) ($14,209) Tapered Insulation (1/4"/ft) SF 10,525 $2.50 $26,313

Subtotal $10,000

Area H Tapered Insulation (1/8"/ft) SF 10,525 ($1.35) ($14,209) Tapered Insulation (1/4"/ft) SF 10,525 $2.50 $26,313

Subtotal $10,000

Area I Flat Insulation (3") SF 6,175 $1.60 $9,880 Coverboard SF 6,175 $1.95 $12,041

Subtotal $20,000 $150,000



Subtotal 13.4% $80,000


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reroofing analysis of k-12 building · 2017-10-11 · concept design phase - modified bitumen on...

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