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[Beatrice Dohrn]

THanks Peter
I don’t know what’s going on under there…. Will see in the summer, but the epdm developed some pinholes causing tiny leaks. So I don’t think it’s enough to address from inside…. 

To be clear, this is a structural issue, not a thermal issue; ie. the 
polysio has degraded to the extent that it no longer supports the deck. 
If so, you could use any number of structural boards like the one 
Norbert suggested or perhaps this Rockwool product 
(https://www.rockwool.com/north-america/products-and-applications/products/comfortboard-110/#Specifications&Sizes 
).

If the polyiso is structurally sound and will likely remain so, can you 
remove the drywall and insulate from below, using a closed cell spray 
polyurethane foam? I think the closed cell foam is about R6/inch and 
should meet the thermal, air and vapour code requirements of your area. 
It may be cheaper than removing the polyiso, plywood, epdm, sleepers and 
decking.

All the best,
Peter
Sent from my iPad
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