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

[Lynelle Hamilton]

Beatrice, I think this is the post to which you were referring?

On 2024-02-20 9:49 p.m., Peter/Pam Martin wrote:
> 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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