charlie a. dooley county executive rebecca howe director of

Pamela J. Reitz, CPFO Director of Administration

Rebecca Howe Director of Procurement &

Administrative Services

Charlie A. Dooley County Executive

August 24, 2012

TO: All Potential Bidders

FROM: Toreen Parker, Procurement Contract Administrator Division of Procurement

SUBJECT: Addendum #3

St. Louis County Invitation for Bid #2012-08-2402-TP Roof Replacement at Multiple Locations St. Louis County Public Works and Parks and Recreation

Included with this addendum are responses to questions asked by bidders at the pre-bid meeting, questions submitted by bidders as of 3:00 p.m. August 24, Section 077200- Roof Accessories; Section 076100- Sheet Metal Roofing and Replacement Specification for Section 07620- Sheet Metal Fabrications.

Bidders Questions and Comments are due by 5:00 p.m. today, August 24, 2012.

Bidders are advised that, for the EPDM roofs, they can use the solvent-based cement, so the requirements are to keep the cement between 60 and 80 degrees until ready for use, and the roof deck temperature must be above 35 degrees.

The Bid Opening date and time remains as Thursday, August 30, 2012 at 2:00 p.m. prevailing Central Time.

Please acknowledge receipt of this Addendum in the space provided below and submit with your bid. Failure to acknowledge this Addendum may render your bid as non-responsive.

ACKNOWLEDGED AND ACCEPTED

_________________________________

COMPANY

_________________________________

NAME

_________________________________

DATE

41 South Central Avenue • Saint Louis, MO 63105 • PH 314/615-7067 AX 314/615-0197 • TTY 314/615-7898 • Fweb http://www.stlouisco.com

INVITATION FOR BID #2012-08-2402-TP ROOF REPLACEMENT AT MULTIPLE LOCATIONS DEPARTMENTS OF PARKS AND RECREATION AND PUBLIC WORKS

Page 1 of 2

QUESTION: Has a core sample been taken of the EPDM roofs and, if so, what are the results?

ANSWER: A core sample has been taken by the County. Existing insulation is 2” thick.Contractor shall provide the same thickness of insulation.

QUESTION: What is the R value for the EPDM roofs?

ANSWER: The R value =12.1. Contractor shall provide the same R value.

QUESTION: Are the EPDM roofs leaking? If not, would the County allow additional time for work to be competed?

The EPDM roofs are not leaking.

Bidders must agree to commence work within seven (7) days from the project start date specified in the “Notice to Proceed” from the Owner. The entire work on the EDPM roofs shall be completed within sixty (60) consecutive calendar days, Sundays and County holidays excluded, from this project start date.

QUESTION: Regarding the roofs at Lakeside; does the County want ridge or gravity vents? No vents were specified.

ANSWER: Cottages A and B require gravity vents. Reference new Section 077200, Roof Accessories, which is accompanies this addendum. A revised drawing is also available from County Blue.

The existing vent types for all other buildings remain the same as the current vents.

QUESTION: Regarding Weinman Center- Is the copper canopy to be replaced?

ANSWER: Reference new Section 076100, Sheet Metal Roofing, which accompanies this addendum. A revised drawing is also available from County Blue.

QUESTION: Please advise where we can find the P.O. Preference Form.

ANSWER: The form is attached to the bid in Mercury Commerce.

QUESTION: In drawing A-3-RE17 is this a roof flanged gutter? If so, you do not bar into gutter.

ANSWER: Yes this is a roof flanged gutter and a termination bar is not required.


Page 2 of 2

QUESTION: How much is the permit for Cottages A and B? What are the sealed drawings?

ANSWER: The cost depends on the construction cost, for example at $100,000.00 construction cost a permit costs $746.00.

QUESTION: What are sealed shop drawings?

ANSWER: Sealed shop drawings are signed off on by a licensed professional AIA architect or PE engineer.

QUESTION: States insulation under SES. Yes or No? If so, you cannot torch to polysio roof insulation.

ANSWER: Yes, there is insulation. Put ½” dens deck on top and torch to that.

QUESTION: What type of gutters on shingle roofs? “k” style, seamless or what?

ANSWER: For the buildings at Lakeside Center, District 2 Salt Dome and Weinman Center, match the existing gutters. For the Parks buildings at Creve Coeur Park and McDonnell Park, see the Replacement Specification, Sheet Metal Fabrications, which accompanies this addendum.

QUESTION: Regarding Cottage G, drawing A-5: Shows ridge vent but not now. Has pan vents existing. Does it get both?

ANSWER: No, contractor shall match existing only. Ridge vents were shown in error.

QUESTION: Does copper roof go?

ANSWER: Yes, the copper roof is to be replaced. Reference new Section 076100, Sheet Metal Roofing, which accompanies this addendum. A revised drawing is also available from County Blue.

QUESTION: Is ice and water shield needed on rake edges or just eaves and valleys?

ANSWER: Not needed on rake edges.

Copyright 2010 AIA MasterSpec Full Length 11/10

SECTION 076100 - SHEET METAL ROOFING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes custom-fabricated, flat-seam sheet metal roofing.

B. Related Requirements:

1. Section 076200 "Sheet Metal Flashing and Trim" for flashings that are not part of sheet metal roofing.

2. Section 079200 "Joint Sealants" for field-applied sealants adjoining sheet metal roofing.

1.3 COORDINATION

A. Coordinate sheet metal roofing installation with rain drainage work, flashing, trim, and construction of roofing substrate, parapets, walls, and other adjoining work to provide leakproof, secure, and noncorrosive installation.

1.4 SUBMITTALS

A. Product Data: For each type of product.

1. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes for each manufactured product and accessory.

1.5 QUALITY ASSURANCE

A. Sheet Metal Roofing Fabricator Qualifications: Employs skilled workers who custom fabricate sheet metal roofing similar to that required for this Project and whose products have a record of successful in-service performance.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Do not store sheet metal roofing materials in contact with other materials that might cause staining, denting, or other surface damage. Store sheet metal roofing materials away from uncured concrete and masonry.

1.7 WARRANTY

SHEET METAL ROOFING 076100 - 1


A. Special Warranty: Warranty in which Installer agrees to repair or replace components of sheet metal roofing that fail in materials or workmanship within specified warranty period.

1. Failures include, but are not limited to, the following:

a. Structural failures including, but not limited to, rupturing, cracking, or puncturing. b. Wrinkling or buckling. c. Loose parts. d. Failure to remain weathertight, including uncontrolled water leakage. e. Deterioration of metals, metal finishes, and other materials beyond normal weathering. f. Galvanic action between sheet metal roofing and dissimilar materials.

2. Warranty Period: Two years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Sheet metal roofing system including, but not limited to, metal roof panels, cleats, anchors and fasteners, sheet metal flashing integral with sheet metal roofing, fascia panels, trim, underlayment, and accessories, shall comply with requirements without failure due to defective manufacture, fabrication, or installation, or due to other defects in construction. Sheet metal roofing shall remain watertight.

B. Sheet Metal Roofing Standard: Comply with SMACNA's "Architectural Sheet Metal Manual" unless more stringent requirements are specified or indicated on Drawings.

2.2 ROOFING SHEET METALS

A. General: Protect mechanical and other finishes on exposed surfaces from damage by applying strippable, temporary protective film before shipping.

B. Copper Sheet: ASTM B 370, cold-rolled copper sheet, H00 temper.

1. Weight (Thickness): 20 oz./sq. ft. (0.70 mm thick) unless otherwise indicated. 2. Nonpatinated Exposed Finish: Mill.

2.3 UNDERLAYMENT MATERIALS

A. Self-Adhering, High-Temperature Sheet: Minimum 30 mils (0.76 mm) thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl- or SBS-modified asphalt adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer.

1. Thermal Stability: ASTM D 1970; stable after testing at 240 deg F (116 deg C) or higher. 2. Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus 20 deg F (29 deg C) or

lower.

2.4 MISCELLANEOUS MATERIALS



A. General: Provide materials and types of fasteners, solder, protective coatings, sealants, and other miscellaneous items as required for complete roofing system and as recommended by primary sheet metal manufacturer unless otherwise indicated.

B. Fasteners: Wood screws, annular-threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed to withstand design loads.

1. General:

a. Exposed Fasteners: Heads matching color of sheet metal roofing using plastic caps or factory-applied coating. Provide metal-backed EPDM or PVC sealing washers under heads of exposed fasteners bearing on weather side of roofing.

b. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws, gasketed; with hex-washer head.

c. Blind Fasteners: High-strength aluminum or stainless-steel rivets suitable for metal being fastened.

2. Fasteners for Copper Sheet: Copper, hardware bronze, or passivated Series 300 stainless steel.

C. Solder:

1. For Copper: ASTM B 32, Grade Sn50, 50 percent tin and 50 percent lead.

2.5 ACCESSORIES

A. Sheet Metal Accessories: Provide components required for complete sheet metal roofing assembly including trim, copings, fasciae, corner units, clips, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items. Match material and finish of sheet metal roofing unless otherwise indicated.

1. Cleats: Intermittent and continuous attachment devices for mechanically seaming into joints and formed from the following materials and thicknesses unless otherwise indicated:

a. Copper Roofing: 16-oz./sq. ft. (0.55-mm copper sheet.

2. Expansion-Type Cleats: Cleats of a design that allows longitudinal movement of roof panels without stressing panel seams; of same material as other cleats.

3. Flashing and Trim: Formed from same material and with same finish as sheet metal roofing, minimum 0.018 inch (0.46 mm) thick.

2.6 FABRICATION

A. General: Custom fabricate sheet metal roofing to comply with details shown and recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions (panel width and seam height), geometry, metal thickness, and other characteristics of installation. Fabricate sheet metal roofing and accessories in shop to greatest extent possible.

1. Flat-Seam Roofing: Form flat-seam panels from metal sheets to match existing panel widths with 1/2-inch (13-mm) notched and folded edges.

B. Fabrication Tolerances: Fabricate sheet metal roofing that is capable of installation to tolerances specified in MCA's "Guide Specification for Residential Metal Roofing."



C. Form exposed sheet metal work to fit substrates with little oil canning; free of buckling and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

1. Lay out sheet metal roofing so transverse seams, if required, are made in direction of flow with higher panels overlapping lower panels.

2. Offset transverse seams from each other 12 inches (300 mm) minimum. 3. Form and fabricate sheets, seams, strips, cleats, valleys, ridges, edge treatments, integral flashings,

and other components of metal roofing to profiles, patterns, and drainage arrangements to match existing and as required for leakproof construction.

D. Expansion Provisions: Fabricate sheet metal roofing to allow for expansion in running work sufficient to prevent leakage, damage, and deterioration of the Work.

E. Sheet Metal Accessories: Custom fabricate flashings and trim to comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions, metal, and other characteristics of item required. Obtain field measurements for accurate fit before shop fabrication.

1. Form exposed sheet metal accessories without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

2. Seams: Fabricate nonmoving seams with flat-lock seams. Tin edges to be seamed, form seams, and solder.

3. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces of accessories exposed to view.

4. Fabricate cleats and attachment devices of sizes recommended by SMACNA's "Architectural Sheet Metal Manual" for application, but not less than thickness of metal being secured.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances, substrate, and other conditions affecting performance of the Work.

1. Examine solid roof sheathing to verify that sheathing joints are supported by framing or blocking, that tops of fasteners are flush with surface, and that installation is within flatness tolerances required for finished roofing installation.

2. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and completely anchored, and that provision has been made for drainage, flashings, and penetrations through sheet metal roofing.

3. Verify that air- or water-resistant barriers have been installed over sheathing or backing substrate to prevent air infiltration or water penetration.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 UNDERLAYMENT INSTALLATION

A. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free. Prime substrate if recommended by underlayment manufacturer. Comply with temperature restrictions of underlayment manufacturer for installation; use primer for installing underlayment at low temperatures. Apply in shingle fashion to shed water, with end laps of not less than 6 inches (150 mm) staggered 24inches (600 mm) between courses. Overlap side edges not less than 3-1/2 inches (90 mm). Roll laps and edges with roller. Cover underlayment within 14 days.



1. Apply self-adhering sheet underlayment over entire roof.

B. Install flashings to cover underlayment according to requirements in Section 076200 "Sheet Metal Flashing and Trim."

3.3 INSTALLATION, GENERAL

A. General: Install sheet metal roofing to comply with details shown and recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to installation characteristics required unless otherwise indicated on Drawings. Install fasteners, solder, protective coatings, separators, sealants, and other miscellaneous items as required for complete roofing system and as recommended by fabricator for sheet metal roofing.

1. Install sheet metal roofing true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

2. Anchor sheet metal roofing and other components of the Work securely in place, with provisions for thermal and structural movement.

3. Field cutting of sheet metal roofing by torch is not permitted. 4. Locate and space fastenings in uniform vertical and horizontal alignment. Predrill panels for

fasteners. 5. Lap metal flashing over sheet metal roofing to direct moisture to run over and off roofing.

B. Fasteners: Use fastener sizes that penetrate substrate not less than recommended by fastener manufacturer to achieve maximum pull-out resistance.

C. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each contact surface, or by other permanent separation as recommended by sheet metal manufacturer or SMACNA.

D. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.

3.4 CUSTOM-FABRICATED SHEET METAL ROOFING INSTALLATION

A. Fabricate and install work with lines and corners of exposed units true and accurate. Form exposed faces flat and free of buckles, excessive waves, and avoidable tool marks, considering metal temper and reflectivity. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant. Fold back sheet metal to form hem on concealed side of exposed edges unless otherwise indicated.

1. Install cleats to hold sheet metal panels in position. Attach each cleat with at least two fasteners to prevent rotation.

2. Space cleats not more than 12 inches (300 mm) o.c. Bend tabs over fastener head.

B. Soldered Joints: Clean surfaces to be soldered, removing oils and foreign matter. Pre-tin edges of sheets with solder to a width of 1-1/2 inches (38 mm); however, reduce pre-tinning where pre-tinned surface would show in completed Work.

1. Do not use torches for soldering. 2. Heat surfaces to receive solder, and flow solder into joint. Fill joint completely. Completely

remove flux and spatter from exposed surfaces. 3. Copper Soldering: Tin edges of uncoated sheets, using solder for copper.




3.5 ACCESSORY INSTALLATION

A. General: Install accessories with positive anchorage to building and weathertight mounting, and provide for thermal expansion. Coordinate installation with flashings and other components.

1. Install components required for complete sheet metal roofing assembly including trim, copings, seam covers, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items.

2. Install accessories integral to sheet metal roofing that are specified in Section 076200 "Sheet Metal Flashing and Trim" to comply with that Section's requirements.

B. Flashing and Trim: Comply with performance requirements, manufacturer's written installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Provide concealed fasteners where possible, and install units true to line, levels, and slopes. Install work with laps, joints, and seams that are permanently watertight and weather resistant.

1. Install flashing and trim as required to seal against weather and to provide finished appearance. Locations include, but are not limited to, eaves, rakes, corners, bases, framed openings, ridges, fasciae, and fillers.

2. Install continuous strip of self-adhering underlayment at edge of continuous flashing overlapping self-adhering underlayment, where "continuous seal strip" is indicated in SMACNA's "Architectural Sheet Metal Manual" and on Drawings.

3. Install exposed flashing and trim without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems. Install sheet metal flashing and trim to fit substrates, and to result in waterproof and weather-resistant performance.

3.6 CLEANING AND PROTECTION

A. Clean exposed metal surfaces of substances that interfere with uniform oxidation and weathering.

B. Clean and neutralize flux materials. Clean off excess solder.

C. Clean off excess sealants.

D. Remove temporary protective coverings and strippable films as sheet metal roofing is installed unless otherwise indicated in manufacturer's written installation instructions. On completion of sheet metal roofing installation, clean finished surfaces as recommended by sheet metal roofing manufacturer. Maintain sheet metal roofing in clean condition during construction.

E. Replace sheet metal roofing components that have been damaged or have deteriorated beyond successful repair by finish touchup or similar minor repair procedures.

END OF SECTION 076100

Copyright 2010 AIA MASTERSPEC Full Length 11/10

SECTION 077200 - ROOF ACCESSORIES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Gravity ventilators.

1.3 PERFORMANCE REQUIREMENTS

A. General Performance: Roof accessories shall withstand exposure to weather and resist thermally induced movement without failure, rattling, leaking, or fastener disengagement due to defective manufacture, fabrication, installation, or other defects in construction.

1.4 SUBMITTALS

A. Product Data: For each type of roof accessory indicated. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes.

1.5 COORDINATION

A. Coordinate layout and installation of roof accessories with roofing membrane and base flashing and interfacing and adjoining construction to provide a leakproof, weathertight, secure, and noncorrosive installation.

PART 2 - PRODUCTS

2.1 METAL MATERIALS

A. Aluminum Sheet: ASTM B 209 (ASTM B 209M), manufacturer's standard alloy for finish required, with temper to suit forming operations and performance required.

1. Mill Finish: As manufactured.

B. Aluminum Extrusions and Tubes: ASTM B 221 (ASTM B 221M), manufacturer's standard alloy and temper for type of use, finished to match assembly where used, otherwise mill finished.

2.2 MISCELLANEOUS MATERIALS

ROOF ACCESSORIES 077200 - 1


A. General: Provide materials and types of fasteners, protective coatings, sealants, and other miscellaneous items required by manufacturer for a complete installation.

B. Bituminous Coating: Cold-applied asphalt emulsion complying with ASTM D 1187.

C. Underlayment:

1. Felt: ASTM D 226, Type II (No. 30), asphalt-saturated organic felt, nonperforated. 2. Polyethylene Sheet: 6-mil- (0.15-mm-) thick polyethylene sheet complying with ASTM D 4397. 3. Slip Sheet: Building paper, 3-lb/100 sq. ft. (0.16-kg/sq. m) minimum, rosin sized.

D. Fasteners: Roof accessory manufacturer's recommended fasteners suitable for application and metals being fastened. Match finish of exposed fasteners with finish of material being fastened. Provide nonremovable fastener heads to exterior exposed fasteners. Furnish the following unless otherwise indicated:

1. Fasteners for Aluminum Sheet: Aluminum or Series 300 stainless steel.

E. Asphalt Roofing Cement: ASTM D 4586, asbestos free, of consistency required for application.

2.3 GRAVITY VENTILATORS

A. Low-Profile, Cylindrical-Style Gravity Ventilators: Manufacturer's standard, fabricated as indicated, with manufacturer's standard welded or sealed mechanical joints.

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

a. Active Ventilation Products, Inc. (Basis-Of-Design PV-12) b. Greenheck Fan Corporation. c. Loren Cook Company.

2. Construction: Integral base flange, vent cylinder, cylinder bird screen, and rain cap, hood. 3. Dimensions: As indicated on attached Drawings. 4. Configuration: As indicated on attached Drawing. 5. Vent Cylinder, Base Flange, and Rain-Cap, Hood Material: Aluminum sheet, of manufacturer's

standard thickness. 6. Finish: Mill

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, to verify actual locations, dimensions, and other conditions affecting performance of the Work.

B. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and securely anchored.

C. Verify dimensions of roof openings for roof accessories.

D. Proceed with installation only after unsatisfactory conditions have been corrected.




3.2 INSTALLATION

A. General: Install roof accessories according to manufacturer's written instructions.

1. Install roof accessories level, plumb, true to line and elevation, and without warping, jogs in alignment, excessive oil canning, buckling, or tool marks.

2. Anchor roof accessories securely in place so they are capable of resisting indicated loads. 3. Use fasteners, separators, sealants, and other miscellaneous items as required to complete

installation of roof accessories and fit them to substrates. 4. Install roof accessories to resist exposure to weather without failing, rattling, leaking, or loosening

of fasteners and seals.

B. Installation: Install 14 ventilator’s on the West side of the roof, 2’-0” below ridge, equally spaced along the length of roof between the existing roof joists. Cut and remove the existing roof sheathing for the ventilator exhaust. Typical for Lakeside Cottages A & B.

C. Metal Protection: Protect metals against galvanic action by separating dissimilar metals from contact with each other or with corrosive substrates by painting contact surfaces with bituminous coating or by other permanent separation as recommended by manufacturer.

1. Coat concealed side of uncoated aluminum roof accessories with bituminous coating where in contact with wood, ferrous metal, or cementitious construction.

2. Underlayment: Where installing roof accessories directly on cementitious or wood substrates, install a course of felt underlayment and cover with a slip sheet, or install a course of polyethylene sheet.

3. Bed flanges in thick coat of asphalt roofing cement where required by manufacturers of roof accessories for waterproof performance.

D. Gravity Ventilator Installation: Verify that gravity ventilators have unrestricted airflow.

3.3 REPAIR AND CLEANING

A. Clean exposed surfaces according to manufacturer's written instructions.

B. Clean off excess sealants.

C. Replace roof accessories that have been damaged or that cannot be successfully repaired by finish touchup or similar minor repair procedures.

END OF SECTION 077200


REPLACEMENT SPECIFICATION CREVE COUER AND MCDONNELL PARKS

TECHNICAL SPECIFICATION SECTION 07620 – SHEET METAL FABRICATIONS(PAGE 14) is hereby Replaced as below:

SHEET METAL FABRICATIONS

General: Fabricate sheet metal items in thickness or weight needed to comply with performance requirements but not less than that listed below for each application and metal.

Gutters – 6 inches: Fabricate from the following material (Style to Match Existing):

Aluminum: 0.0320 inch thick.

Aluminum guttering to be replaced shall be seamless, with the same attachment hardware as existing (which is to be replaced).

Downspouts – 3 inch by 4 inch: Fabricate from the following material:

Aluminum: 0.024 inch thick

charlie a. dooley county executive rebecca howe director of

Documents