Hello Kenton,

Actually, the primary function of an H-clip is to provide spacing (not edge support) for the decking. The spacing is designed to allow for expansion and contraction during seasonal changes.

Now, do they provide some edge support? Sure. But that is not their primary function or design (to provide strength)... it to prevent edge buckling.

Ever seen horizontal buckling or raised sections of the roof covering... not usually. Usually it will be in the form or vertical (from drip to ridge) buckling. That's because the yahoos will sometimes butt the edges up against each other.

Rich

Rich

__________________
"If con is the opposite of pro, is Congress the opposite of progress?"
Richard Rushing, HCRI
Duncanville, Tx.