[RE-wrenches] Metal roof support flashing

[Kelly Keilwitz, Whidbey Sun & Wind]

Laura,
I attended that seminar, too....the statistics on the overwhelming high
percentage of liability cases being due to water incursion into the building
made me sit up and pay attention.

Do you know if the ³EternaBond² sealant is compatible with polyurethane
sealant? I would prefer to fill our pre-drilled holes with sealant before
applying the lag bolt. Does enough of the tape/sealant remain under the
stanchion base to maintain separation between the metals?

Thanks, 
-Kelly 

Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd, 
Coupeville, WA 98239
PH & FAX 360-678-7131
sunwind at whidbeysunwind.com


On 6/18/09 5:36 PM, "Laura Uhler" <laura.uhler at solarki.com> wrote:

> Hi,
> 
> I talked with the roofer who gave the "Best Roofing Practices for PV" course
> at the NW Solar Expo, and at the Oregon Dept of Energy.  I then took his
> recommendation and ran it by two local roofing professionals, who similarly
> approved.  They recommended using the EternaBond "Tape" product.  It looks
> like a 1/4" thick pre-rolled roof caulking.  I get it in 2" wide rolls, or,
> you may be able to purchase it pre-cut.  (It's not cheap.)  You peel off the
> plastic outer layer and put it on the back of the L-feet.  I put on a double
> layer.  It becomes activated by pressure, so, when you screw your stainless
> steel lag bolts (with washers) into the underlaying rafters, the EternaBond
> will ooze up in to fill the cavity between the washer and oval L-foot hole.
> 
> I'd recommend that you allow yourself several hours to cut the EternaBond and
> pre-apply it to the L-feet before bringing the hardware on the roof.  That
> way, only the final layer of plastic needs be removed before screwing the
> L-foot onto the roof.  But, be warned, even with a top plastic layer on the
> "tape", the EternaBond will stick to everything!   There is no doubt that this
> is a much more solid, waterproof connection than the dollops on caulking
> around the six screws that must hold down every boot.
> 
> Good Luck!
> 
> Laura


 


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