Seed Home 2 Roof

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Notes

• EPDM can be installed directly over EPS. [1]

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Parameters for assessing cost and practicality:

1. Materials: EPDM, TPO or PVC
2. Installation method: fully adhered, mechanically fasteners + heat welded (seams only) or mechanically fastened + glued (seams only)
3. Form factor: all of these materials come in a variety of sizes - but none is a perfect fit for our roof size - so we need to pick the one that leads to the least waste (cut ends)

Suppliers that sell directly to the public.

Roofkit (EPDM only, I think):

• Product line at menards: 45 mil EPDM, latex adhesive, primer, seam tape. This comes out to around $1.15/sq ft - but that doesn't include the cost of seams (which use primer and seam tape) nor waste due to form factor.
• Installation manual
• Website - with installation videos and FAQ

WeatherBond (EPDM, TPO and PVC)

• Comes in a variety of sizes (for example). Can also be acquired by the foot.
• Fastener plates
• Installation videos
• Loads of technical and how-to details (if you can make sense of them):

1. [2]
2. [3]
3. [4]
4. [5]
5. [6]
6. [https://www.weatherbondroofing.com/wp-content/uploads/603160-4044-WB-TPO-Rooftop-Detail-Installation-Guide_04-19-18.pdf
7. [7]

Installing mechanically fastened TPO seems relatively straightforward up to a point (you unroll the membrane, fasten the edges to the deck with screws and plates, overlap the next sheet and heat-weld the seam). But on the written instructions they keep talking about "perimeter sheets" - but I can't find out what perimeter sheets are, how many we need, how much they cost nor how to install them (are they glued?). It's like a ghost material :)

They also make a weld-free TPO, but I can't find it for sale online (we may need to contact the manufacturer). Weld-free means Seam Tape.

1. https://www.weatherbondroofing.com/wp-content/uploads/604551-WB-1035-Weld-Free-TPO-Trifold-Brochure_03-22-18.pdf
2. https://www.weatherbondroofing.com/wp-content/uploads/WB-1042-Weld-Free-TPO-Installation-Guide_02-01-18.pdf

One more thing: Elijah says he doesn't know whether TPO can still be heat-welded after prolonged exposure to UV. So this is a question for the manufacturer - as it would affect if and how we could reuse the membrane.

Mechanically fastened roofing membranes:

1. https://youtu.be/tHkaXuxgqjo?t=28
2. https://youtu.be/zX8T7h-UDg8?t=92
3. https://www.youtube.com/watch?v=Bk03UlnvdOs
4. https://www.youtube.com/watch?v=q3IWuCndhh0

See also Roofing Membranes