I want to remember this video by Matt Risinger: Deck Over A Flat Roof (4/13/2018)
The roof is a "bathtub" with drains and scuppers. "We've got some sloping on this deck." (Details would be nice.) Plastic standoffs from Bison hold up a wood deck--they are not physically connected to the deck--no penetrations. The wood deck is 2' x 4' panels.
TPO - Thermoplastic polyolefin. White, reflective, single-ply roofing membrane. Roofonline.com says "PVC roofing is better. TPO is usually somewhat cheaper." 45-mil TPO. Puncture resistance: TPO is tougher than EPDM, but not as tough as PVC.
Ascent Roofing - Single Ply TPO Roof Installation Process Explained (7/15/2022). 1/4" or thicker underlayment in 4x8 sheets. TPO seems like linoleum.
Older: Top 3 Flat Roof Materials Explained - Torch Down, EPDM, TPO - Which is the best? (4/8/2016)
EPDM: .045", .060", .090" - Most use .060" (about as thick as a quarter). It's the cheapest. You need walk mats, because EPDM is so puncture-prone.
TPO: .045" and .060". Seams are heat-welded, not glued. Only been in use since about 2000. Only 15-20 year warranties.
Torch-down is 5 layers, more puncture-resistant. 3/8" thick. Modified bitumen. Over fiberglass liner.
Roofonline.com says single-ply membranes say minimum roof pitch is 1/4" per foot. So, for a 20' wide roof, we need 2.5" on either side of a ridge or valley, or 5" from one side to the other.
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