Ken: We have experienced this. There is a provision in the California building code that states: though shall not cut, drill or notch structural members. Our interpretation is a driven lag is not the same as a drilled hole.
We had to pay a structural engineer to draft a generic letter allowing driven lags as long as they were: no greater than 5/16”, not penetrating more than 3” and not closer than 1/2” from edge of rafter. California expedited solar permitting guidelines have a nifty drawing showing acceptable lag placement at least 0.5” from either edge of rafter. Providing this drawing and specifying a rafter edge finding tool bolstered our case. If you want to look at the docs contact me off-line. Good luck to you. William Miller www.millersolar.com > On Aug 4, 2020, at 3:45 PM, Ken Schaal <[email protected]> wrote: > > > On the past I've had plan reviewers object to any hole or lag into rafters, > especially trusses, claiming it voided warranty...any thoughts? > Ken Schaal > > > On Tue, Aug 4, 2020, 5:45 PM Jeremy Coxon <[email protected]> wrote: >> We have tried all manner of gadgets over the years and haven’t found >> anything more accurate than a hammer and a tuned (experienced) ear. Gentle >> taps (so as to not damage roof) are all that’s needed. We also have a 12” >> piece of solid #10 copper in each tool belt for those tricky roofs where >> rafter spacing isn’t consistent or there are sistered rafters for long >> spans. Insert the wire thru a test hole, bend into a U shape, then rotate >> to find exact location of rafter, mark with chalk, then go to town. >> >> Jeremy Coxon NABCEP >> Certified MWBE >> >> Sent from my iPhone >> >> > On Aug 4, 2020, at 5:34 PM, [email protected] >> > wrote: >> > >> > Re: Flir One for Smart Phones (Jason Szumlanski) >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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