[Greenbuilding] Polyiso strength on roof

Ron Cascio roncascio at verizon.net
Sun Dec 7 11:44:51 CST 2014


Sounds good to me.

 

Ron

 

From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Bill Allen
Sent: Sunday, December 07, 2014 10:52 AM
To: Green Building
Subject: [Greenbuilding] Polyiso strength on roof

 

Hi all

I am about to reroof my 1926 colonial and am looking to also insulate per
the BSC "deep energy retrofit" plans consisting of plywood sheathing, 2
layers of 2" polyiso, another layer of plywood, then roofing (in my case,
standing seam metal roofing).

The original roof was wooden shingles that are still in place with 2 layers
of asphalt on top. Also still in place are the nailers for the wood
shingles...roughly 1x2s, 5.5" on center across the rafters.

 

My question is: if I leave the 1x2 nailers in place during the demo can i
exclude the first layer of plywood and install the polyiso directly on the
nailers? It would then have plywood on top, secured with long screws into
the rafters. Less material and less cost.

 

Thanks for any thoughts/comments.

 

 

Sent from my cell phone

< dy>

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