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Stainless steel lag bolts are used to fasten L-feet to the roof structure. The length and diameter of the bolt depends on the pull-out strength needed, and the thickness of the non-structural material (shingles & sheeting) being passed through.
Because lag bolt requirements vary with design wind load and lumber used for the roof trusses, lag bolts are no longer provided with SolarMount L feet.
The table below (reproduced from Unirac's Technical Bulletin 103: Code Compliant SolarMount Installation) lists pull-out values for various roof truss lumber and lag screws. To ensure code compliance, the lag pull-out value must exceed the installation's design live load per footing multiplied by an appropriate safety factor.
Lag Pull-Out Values (lbs) in Typical Roof Truss Lumber
The table below (reproduced from Unirac's SolarMount Canadian Code Compliant Installation Manual) lists lag bolt withdrawl resistance for some commonly available wood species in Ontario.
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