I always thought that installing lag screws was tough enough with pilot
holes- I should hit the gym. I'm not a structural PE, but I think that
not drilling pilot holes violates the American Wood Council's National
Design Specs and therefore violates the IBC too. I would imagine that
you'd be much more likely to split your trusses. IBC also requires
flashings be used but at least around here inspectors never ask for it
(which makes sense- as you all know, Florida never sees wind or rain,
and definitely not at the same time). What silicone do you use that's
compatible with asphalt shingles?
DKC
On 2012/7/1 21:13, [email protected] wrote:
In my 20 year experience of lagging down L feet on shingle roofs in
Indiana with a good dollop of silicone caulk under the foot, I've never
had an issue. No pre-drilling, just drive the lag home. Drilling a hole
first is not necessary, and reduces holding strength. No reason to make
a science project out of it and increase cost and labor.
Mark
-------- Original Message --------
Subject: Re: [RE-wrenches] L feet no flashing in shingle roof
From: Drake <[email protected]
<mailto:[email protected]>>
Date: Fri, June 29, 2012 3:09 pm
To: RE-wrenches <[email protected]
<mailto:[email protected]>>
Hi Jay,
There is no room for flashings. The L feet will go very close to the
skylights and the flashing would hit the edge of them. Plus there is
an existing array that was done by another installer that is done
with L feet only. The new array would be higher.
And given that we have really good off the shelf approved flashed
feet, why would you use anything else?
My 2 cents,
Jay
peltz power
On Jun 29, 2012, at 5:16 AM, Glenn Burt wrote:
We have used a variety of sealants over the years, and determined
simple Henry roofing cement is the best product for use on comp
roofing.
We also used to bend our own L-foot flashing, which we cut from
standard Al coil stock (before all the manufactured options were
available). This might be a good option for you in this case.
Glenn
*From:* [email protected]
<mailto:[email protected]>
[mailto:[email protected]] *On Behalf Of
*Drake
*Sent:* Thursday, June 28, 2012 6:40 PM
*To:* RE-wrenches
*Subject:* [RE-wrenches] L feet no flashing in shingle roof
I'm quoting a job that has an existing array with L feet bolted
down to a shingle roof with no flashings. I want to match the
height of the existing array. Also some modules are being worked
in around skylights where it is unlikely that room would be
available for flashings to center over rafters.
I've always used flashings. Would it be completely crazy to
follow suit of the existing array and bolt L feet straight to the
shingle roof with good roof sealant? If so, how would you seal it?
Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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