Roof With Rigid-Foam Insulation need attachments

[ccudal]

Does anyone have experience installing PV on roof with insulation? what attachments did you use? thank you


insulation.jpg

[solarix]

Are there not "sleepers" - 2x framing between the two layers of sheathing? You need to find them and attach there...

[ccudal]

I don't think so. it is plywood - 8" insulation - plywood - rafter. it is much the same as the image. my colleague suggest Unirac Flashloc RM or OMG Powergrip but i'm not sure if it is compatible with shingle roofing.

[PVAndy]

I don't think so. it is plywood - 8" insulation - plywood - rafter. it is much the same as the image. my colleague suggest Unirac Flashloc RM or OMG Powergrip but i'm not sure if it is compatible with shingle roofing.

You can use RT-Mini's and attach to the plywood if it's 7/16" or greater

https://roof-tech.us/pages/rt-mini

Andy

[solarix]

Almost all building departments require fastening into the roof structure. Surface mounts may work if you can get a manufacturer to provide a engineered document supporting this method.

[ccudal]

You can use RT-Mini's and attach to the plywood if it's 7/16" or greater

https://roof-tech.us/pages/rt-mini

Andy

thank you. I was thinking of this (RT mini) but i'm concern with the rigid foam to be compress. OMG powergrip is design the go thru insulation but it is only for flat roof

[PVAndy]

Almost all building departments require fastening into the roof structure. Surface mounts may work if you can get a manufacturer to provide a engineered document supporting this method.

We've not had any problems getting them permitted with a structural letter from a PE. Also RT-Mini installation instructions show both lag into rafter and 4 bolt substrate mount.

Any