[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

[Jay]

Hi Scot

What a fascinating issue. 
I can’t help as to the structural concerns but I like the deck mounts idea to make sure you don’t have any issues. 

Jay

> On May 29, 2024, at 4:17 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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