[RE-wrenches] Flir One for Smart Phones (Jason Szumlanski)

[William Miller]

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 <Ken at commonwealthsolar.com> 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 <jcoxon at sunwindpowerinc.com> 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, re-wrenches-request at lists.re-wrenches.org wrote:
>> > 
>> > Re: Flir One for Smart Phones (Jason Szumlanski)
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