Seed Home 2 Roof

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


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. [
  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.


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:


See also Roofing Membranes