The Basics about Rooftops and Solar Arrays

July 08, 2012

Roofing Types & Comparison• Membrane

Common in commercial re-roofing projects, particularly for low slope roofs (<3 in 12 pitch) Easy installation & low cost with 15 year warranty typical / low weight ratio (psf) Welded seam and fully adhered applications / low maintenance White membrane has a high solar reflectance and very energy efficient

• Built-Up Common practice for decades due to availability of materials Messy to install, reasonable cost with various types of applications (hot mopping) Basic concept is to use an asphalt or tar base with an outer coating, such as fiberglass

composite shingle or gravel / higher weight ratio

• Metal Typically used for aesthetic purposes during new construction applications Skilled workers needed to install / mechanically attached to the structure Higher cost with long life expectancy / low maintenance /pre-fab panels with various colors

• Spray Foam Commonly used over existing Built-Up roofs with extensive leaks / not a solo application Cheap and fast method to re-roof / can be highly reflective and very energy efficient Higher maintenance activity required / lower life expectancy

EPDMEthylene propylene diene monomer

TPOThermoplastic Polyolefin

PVC

Polyvinyl Chloride

6

Asphalt Impregnated Fiberglass(Rolled Composite)

7

Composite Shingle

Tar & Gravel

Modified Bitumen (ModBit)

10

Composite Shingle

11

Standing Seam Metal Roofing

Corrugated Metal

13

SPF – Sprayed polyurethane foam

14

Walkway Protection TPO and EPDM Roofs

15

Lead Roof Jacks

• Lead roof jacks are malleable

• Lead roof jacks are used on • Built up roofs• Composite shingle roofs• Tile roofs

16

Sheet Metal Roof Jacks

• With and without rubber boot

• Used on asphalt and composite shingle roofs

• Long life expectancy due to galvanized coating

• Highly resistant materials and construction

Metal Roof Jack with Composite Shingle Roof

18

Anchoring PV SystemsRooftop Applications

• Mechanically Fastened• Use fasteners to attach standoffs to structural members• Requires cutting of new or existing roofing system• Capable of withstanding high wind loads (130+ mph)• Higher potential for leaks due to high number of penetrations

• Ballasted• Use dead weight (bricks) to hold system in place• Zero penetrations / limited seismic & wind loading compliance• Need strong structure to support high psf of system• Can be hard to obtain a building permit / IBC compliance

• Hybrid• Uses both mechanical fastened and ballasted components• Benefits from both types of applications for seismic and wind

compliance• Can be labor intensive or not as cost effective

Mechanically FastenedSunlink

20

Mechanically FastenedUnirac U-LA

Standoff in Built-up Roof

21

Ballasted

22

Slip Sheets

23

• Tilt brackets may puncture roofing materials if slip pads are not installed• Slip pads under tilt brackets help prevent roofing materials from buckling

24

Conduit Supports• Cooper B-Line Dura-Bloks ® and Caddy®

Pyramids make excellent conduit supports, no slip pads are required

• For single small-conduit runs Trex ® decking lumber can be used for long-lasting conduit support

• Wood, even treated wood, is not a long lasting conduit support

25

Prefabricated TPO Membrane Roof Jack

• Manufactured TPO roof jacks come in several different styles

• Less expensive on labor versus custom roof flashing

Pre-manufactured roof jacks make installation fast , clean and durable

26

Custom Flashings

• Typically more expensive than pre-manufactured products

• Always available for installation if roofing membrane is on site

• Best application for unique or short standoffs

Sequence of Eventson a typical

Rooftop Solar Array

28

Skylight Fall Protection

29

Position the Substructure

30

Installing the Modules

31

Mark and Cut

32

Remove Insulation

33

Attach Mounting Block

34

Roofing

35

Sealed Penetration

36

Completed System!

37

About Blue Oak Energy

Projects in operation:

350 MW Work in progress:

200+ MW PV Systems Designed:

453

Closely held entrepreneurial companywith a solid and passionate management team since 2003

Relationship orientedwe deliver for our customers and grow from repeat business

Downstream focuseddesigning and building PV systems

Scale drivencommercial & utility segments fuel our growth

Ideally located60% of the US solar market is located in California but we work nationwide

39

Mission

Vision

Values

We will design, build and maintain solar energy to last a lifetime.

We expect solar energy will be cost competitive with brown power by 2015 in 75% of the US.

Culture. Teamwork. Perspective.

Distributed Wal-Mart Sites – 6MW totalBOE performed the engineering and construction management for (12) 500kW arrays in California.Wal-Mart has solar arrays installed on nearly 100 of their stores as of 2012.

www.blueoakenergy.com