[RE-wrenches] EPDM Roof Attachment/Flashing

wirewiz at gmail.com wirewiz at gmail.com
Mon Dec 31 06:17:26 PST 2012


Hello Wrenches,

Installing rail mounted PV array on a 2 1/2 / 12 pitch EPDM residential
roof. It's a flat section of roof in the middle of the house. Need to keep
it low so would like to use 3" or 4" Unirac standoffs. The standard 1-6"
peel and stick witches hat is fine for a 7" standoff but too tall for the
3-4" standoff. Unirac and Oatey have advised against using the
Oatey aluminum flashing although the roofer who did the roof said it would
be OK using seam tape between the Oatey and the EPDM. Another roofer I know
has said absolutely not.

I did find a rubber Masterflash (6" x 6" base) that's a good fit but all
their images show it used on metal roofs only and it's not a peel and
stick. Can I use it with seam tape and/or caulking.

Do I just need to go with the 7" standoff and the standard peel and
stick witches hat and forget the low profile?

Or is their some other system out there (roof attachment/flashing) that
would keep it low. The ridge height is already at the 35 ft limit and the
upper row of mod's would go above the ridge with the 7" standoff.

I will work with a roofer but would like to figure this out before just
turning it over to the roofer

Very much appreciate any thoughts.

Thank you and Happy New Year to you all.

Larry Liesner
Design and Installations
Elektron Solar, LLC
49 Richmondville Ave Suite 107
Westport, CT 06880
203-557-3127 (office)
203-644-2404 (cell)
203-549-0977 (fax)
wirewiz at gmail.com
NABCEP Certified PV Installer (# 032611-184)
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