SIPs [RE-wrenches]

William Miller wrmiller at charter.net
Thu Aug 17 21:19:32 PDT 2006


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Daryl:

We installed on a flat roof that was composed thusly (described from top down):

Gravel
Mop
Felt
Rigid insulation
Sheeting
Rafters

We obviously could not lag through the rigid foam as it would compress, 
loosening lags, causing leaks and generally de-stabilizing the arrays.  Our 
solution was to saw out insulation down to the sheeting and place 4x8 
blocks sideways across two rafters on a standard spacing.

A roofing contractor injected foam around the blocks.  Then they cut 45 
degree "cant" strips in some kind of material to place around the 
blocks.  They then cut a roll or membrane roofing to fit around the blocks 
and mopped and graveled around the whole thing.  We then had solid wood to 
lag into.  Looked and worked great.  I think this applies to your 
situation.  I can post photos to our web site upon request.

William Miller


At 01:16 PM 8/17/2006, you wrote:


>Hi all,
>    I am working on an estimate to install a +/- 4 kw array on a stress
>skin type panel roof. It is composed of 1/2" Avantek sandwiching 9" of
>foam insulation. It is already roofed.
>    My thought was to manufacture some 4" wide steel stock for both the top
>and underside of the roof. I would use use stainless steel or
>galvanized threaded rod to penetrate the standoffs/feet, top steel
>plate, through the Avantek and foam through to the other side,
>penetrating the Avantek and steel plate on the inside (storage space
>above the garage). I would use 1/2 threaded rod.
>    Does anyone have experience with this? Should I walk away from the job
>for liability reasons?
>Thanks for any comments,
>Daryl
>Penobscot Solar Design
>NABCEP Certified installer


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