We just did one, and I used some fairly short Timberlok type lags (thinner and stronger)  I wasn't super excited about only having an inch of wood to grab, but the edge wood is stronger and denser than regular 2x material it seemed. 
I predrilled the holes, and got solid anchors, without splitting.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer, 
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 11/6/2013 11:14 AM, William Miller wrote:

Friends:

 

I am designing an installation on a roof built with engineered rafters.  These are wood I-beams with 2X4s (or smaller) on flat, dadoed to accept an OSB flange in between.  On top is sheeting and then sheet metal.  I have never attached to engineered rafters

 

I checked on DPW easy Feet and they look like my best option so far. .  Has anyone else done this before?

 

Thanks in advance for all the great idea I you professionals are willing to share.

 

William Miller

 

 

cid:679355323@23072013-1054

17395 Oak Rd. Atascadero, CA 93422

www.millersolar.com

805-438-5600 voice

 



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