Hi Mark,

Having learned of Eternabond on this list, we've since used the doublestick 
version on two, raised rib type metal roofs. Of course, it's way too early to 
tell how it will perform over time, but we were quite impressed during
installation.  
It's ferociously sticky. You'll want to place your L-feet very carefully.

We went with the dollop of silicone (Lexel) followup, though Eternabond does 
make a single stick product that might be appropriate to place over top of 
the lags. The stuff does squeeze out well while tightening the lags. My sense
was the teeth on the L-feet bottoms were very close to, if not touching the 
metal roofing surface, meaning no more compression over time.

I like it better than the traditional use of schmutz alone. Twenty screws
around an Oatey flashing seems nuts unless you have an irregular surface
to conform to, or for your conduit roof penetration.

Need a new metal roof? Go with true standing seam pans and use Unisolar PVL
modules.

Dick Ratico
Solarwind Electric

--- You wrote:
Wrenches,

It has been a while since I have seen this subject and I was wondering if
there has been more experience in the field with using either EPDM or
products such as http://www.eternabond.com/DoubleStick-p/cr-ds.htm for
sealing L-feet or stand-offs directly to metal roofing. . .

Seems to make sense to directly seal off the one or two holes for that lags
rather than placing a boot over it and drilling 20 screws around the Otey.
The only weakness I could see would be the seal directly over the lags, but
I think this could be cured with a dollop of silicone or other EPDM safe
caulk in and on top of the hole.

My main worry is the compression of the material over time, which may
compromise the bond/seal.

 

Has anyone successfully used the Eternabond-looks like it could be a good
solution.

 

 

Best regards,

 

Mark Dickson,

NABCEP Certified Solar PV Installer T

Oasis Montana Inc.
--- end of quote ---

