[RE-wrenches] to flash or not to flash

[David Brearley]

It may be helpful to distinguish between exposed-fastener metal roofs and other roofing systems. 

If you’re working on a metal roof that is attached with exposed fasteners, I don’t know of any practical solution for retrofitting PV without adding more exposed fasteners. And, yes, the mastic under the L-foot will likely outlast the waterproofing around the roof attachments.

However, according to conversations I’ve had with James Kirby, exposed fastener metal roofs are not an NRCA-approved/recognized roofing system. The waterproofing methods on exposed-fastener metal roofs are inherently inconsistent with NRCA standards. 

Other roofing systems are consistent with NRCA standards. If you don’t use flashing with these NRCA-approved roofing systems, your PV attachment method is going to compromise the waterproofing for the roof system. 

You can’t really argue that point, because there are established standards that apply to flashing and waterproofing according to roof type.

David Brearley
Senior Technical Editor, SolarPro 
NABCEP Certified PV Installation Professional
david.brearley at solarprofessional.com
Direct: 541.261.6545
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