[RE-wrenches] TJI rafters

[Ray]

I can see that the TJI manu doesn't want us blowing 3/8" lags through 
the top chord of their engineered system.  On the other hand, it IS 
designed to have nails and at least deck screws put into it, as that's 
how the builder attaches the roof decking.  It seems that William's 
measured approach is (as usual) good advice. I think that multiple 1/4" 
lags with predilled holes might be acceptable, but that would be up to 
the engineers and AHJ.  My issue with the EZ feet is that you are 
entirely dependent on how well the roof decking was installed.  Nails 
and construction staples don't have great pull out resistance, so I 
would hope that the builder uses some type of rated screws to attach the 
decking.

Ray Walters

Remote Solar


On 3/3/18 10:52 AM, William Miller wrote:
>
> Jerry:
>
> We have successfully used the DPW EZ-feet on sheet metal, cathedral 
> roofs with TJI rafters.  The cathedral roof made it impossible to 
> install blocking.
>
> The EZ-feet is supposedly rated to screw solely to roof sheeting.  
> When we first investigated the product, we discovered the fasteners 
> recommended were not properly rated for sheeting thickness ranges.  I 
> understand DPW corrected this.
>
> Nonetheless, we used the EZ feet and used longer sheet metal screws 
> where the foot landed over the TJI. This way we were not using 
> fasteners quite as large in diameter as a lag and we gained the rating 
> for the screws into sheeting that don’t lie over the rafter.
>
> William Miller
>
> Gradient Cap_mini
> Lic 773985
> millersolar.com <http://www.millersolar.com/>
> 805-438-5600
>
> *From:*RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org 
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>] *On Behalf Of 
> *Jerry Caldwell
> *Sent:* Friday, March 02, 2018 1:24 PM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] TJI rafters
>
> Dear Wrenches,
>
> I have a customer with a low slope roof supported by TJI beams. Does 
> anyone have experience permitting and installing on TJIs? I'm curious 
> if jurisdictions are requiring Structural Engineer stamps.
>
> Since the top chord of the beams is only 1 3/8" thick should we be 
> using shorter lag bolts for these installations? It also seems that it 
> would be undesirable to penetrate into the web of the beam.
>
> Any advice would be appreciated here.
>
> Thank you,
>
> Jerry Caldwell
>
>
>
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