[RE-wrenches] SIPS panel roofs

Daniel Young dyoung at dovetailsolar.com
Thu Dec 17 07:29:37 PST 2015


You could look at the S-5 Versa Bracket. http://www.s-5.com/clamps/index_71.cfm 

 

They have 2 types, with the ability of having 3 fasteners each, with a pre-applied butyl strip. These are basically a smaller version of the DPW easyfoot. They have load test data for ½” OSB (since you have 5/8” OSB you should get better pullouts, though you likely can’t assume that for permits).

 

We have not used this on SIPS (no SIPs jobs so far for us, at least not post construction with a vaulted ceiling). But it might be worth looking into.

 

The 9/12 slope does help reduce risks with leaks as well, the steeper the roof, the easier it generally is to keep leak free. Hopefully they used a good underlayment between the metal and the SIPs, if it was a fully adheared, self-healing membrane like Grace Ice/water shield, that’s just one more layer of insurance.

 

You should also ask the client what they did with the SIP install to eliminate air leaks through the seams between SIPs, they’re notorious for being less than air tight at the seams, and the warm-moist inside air leaking through leads to condensation and then to rot, especially along the ridge, following the seams between panels. http://buildingscience.com/documents/insights/bsi-036-complex-three-dimensional-air-flow-networks . (You don’t want calls later in life about roof rot, and have the finger pointed a you because you were the one drilling into the roof.)

 

With Regards,

 

Daniel Young, 

NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90

 

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Will White
Sent: Thursday, December 17, 2015 9:01 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] SIPS panel roofs

 

We’ve also used the ECO-65 which works great but the problem with your roof will be flashing.  The roofs we installed on were asphalt so we could use the flashing.  It’s going to be hard to seal a ECO-65 plate on a metal roof.

 

 


Will White
Director of Construction – East Coast 

RGS Energy

	

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From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Luke Christy
Sent: Wednesday, December 16, 2015 9:45 PM
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] SIPS panel roofs

 

Hi Dana,

We had to do this very thing for a project some years ago. I searched extensively for a product that could allow us to attach directly to the top skin of a SIP panel without having to use blocking or through fasteners. We ended up using an attachment made by EcoFasten Solar. It uses a steel plate with a number of screws (8, I think) that collectively  create the required pullout resistance. They had engineering to support using the product on SIPs, which was awesome. 

 

A quick look at their website shows that they still make a SIP-specific attachment. Their flashing isn't ideal for Pro-panel, but I would think that you could make it work.

 

-Luke

 

 

On Dec 16, 2015, at 16:45, Dana <dana at solarwork.com> wrote:

SIP ROOF INSTALLATION

 

I was asked to install on a SIP panel roof today. 5/8” OSB over 6” of foam on a 9:12 roof pitch at 9800’ elevation with a Pro panel metal roof skin.  There is a finished ceiling underneath the lower side of the SIP roof panel. 

I explained that it was not ideal due to the lack of good attachment etc. They were not concerned and said “you’ll make it work!”

 

I have done SIP panels in new construction and we could install backing from underneath and refoam.

My first thought was to do 2-2.5 times the normal L feet.

One thought was to use expanding moly-bolts.

 

Has anyone have experience attaching to SIP roof that was not prepared for an array? 

 

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