[Greenbuilding] ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Re: Remodeling concerns

[Peter/Pam Martin]

Hi Beatrice,

/On 2/20/24 11:18 a.m., Beatrice Dohrn via Greenbuilding wrote:

/
/Sorry, I guess I was unclear.  I am talking about an outdoor deck.  So 
from inside up presently:
/
/Sheetrock, rafters, plywood, 7" polyiso, plywood, epdm, sleepers, 
decking.  I am looking to replace the insulation portion.  Perhaps board 
rockwool? It's a faswall house, fyi. /

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

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