[RE-wrenches] How many times can a rafter have a lag screw put in and out before it is no longer structurally sound? Some roofs getting their 3rd set of new shingles

[Kristopher Schmid]

That's a great question, Scot.  I don't have an answer, but it did remind
me that for these remove and replace jobs I always measure and record the
old lag locations to make sure that my new penetrations are at least a
couple of inches away.

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Wed, May 29, 2024, 5:16 PM Scot Arey via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> With all our Texas hail storms, we now have roof solar systems that might
> have to come down for the third time as hail-pockmarked shingles need
> replacement. We’re at the 11-year mark of doing business and we have some
> customers ready for another insurance roof claim,
>
>
>
> So that means a new set of lag screws drilled into rafters…after how many
> times is that 2x6 rafter not 2x6 strength?
>
> I’ve asked this to my 3rd party structural engineer and instead of an
> answer got a “wow, hadn’t thought of that.” We’ve considered going to deck
> mounts to avoid rafters at the 3rd “detach and reset.”
>
> Any of you guys consider this and have your techniques? I suppose in
> perfect world, the mount would stay in place and roofer would shingle
> around it but we still use old-school metal flashing so that is really not
> possible. I look forward to hearing your thoughts on this.
>
>
>
>
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