You need a clip for every diagonal beam that attaches to a horizontal beam.
H clips roof trusses.
However two 2 equally spaced h clips are required between supports when spaced 48 inches on center.
Doing this means you can go to the hardware store and be sure that you are buying the right amount of clips.
Use the same size panel edge clip as the panel thickness.
You need to get into the attic of your roof using a ladder and inspect the connections between the diagonal beams and horizontal beams.
H clips are also necessary for other wood panel thickness and span combinations.
For 7 16 inch zip system panels huber engineered woods requires panel edge support blocking or approved edge clips if the on center spacing of the framing members exceeds 16 inches.
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The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
This is what the apa engineered wood construction guide has to say about h clips.
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Quick installation no nails required keeps panels even for a level structural plane provides the 1 8 in.
One or two h clips will often allow a longer span between roof trusses rafters.
One h clip shall be placed between abutting panels at a location midway between each pair of trusses rafters or joists.
Space between plywood panels as recommended by the american plywood association.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
Panel sheathing clips are used to brace unsupported panel edges when sheathing meets edge to edge without a rafter for support.
Their installation diagram also shows h clips although tongue and groove edges or blocking is noted as an alternative in the text above.