They slide easily over the edge of the plywood and make it simple to cover windows without drilling holes. Visit our ROOF AND ATTIC page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles. These clips are a lifesaver for hurricane preparedness. What are the hazards to avoid when going into an attic?.Why does my homeowner's insurance want a roof inspection?.How can I tell if the house needs a new roof?.Do stains on the ceiling mean the roof is leaking?.What does "lack of tab adhesion" in an asphalt shingle roof mean?.How can I be sure my roofing contractor got a permit?.If my roof is not leaking, why does it need to be replaced?.What are the most common problems with wood roof trusses?.Why is a popped nail in a shingle roof a problem? How do I fix it?.Are roof trusses better than roof rafters (stick framing)?.Does a roof with multiple layers of shingles last longer?.What is the building code requirement for an attic access hatch, scuttle, or door?.Why is there no attic access hatch in the house? Simpson Strong-Tie H series of hurricane ties provide a positive connection between truss/rafter and the wall of the structure to resist wind and seismic.Why is it a mistake to replace a roof and not replace its flashings?.What is the life expectancy of an asbestos cement shingle roof?.What are the common problems with attic insulation?.How can I tell if a roof has more than one layer of shingles?.When were staples banned for roof sheathing attachment in Florida?.How can I inspect my roof for hurricane damage?.When did Florida start requiring re-nailing of roof deck sheathing for a roof replacement?.What are common problems of asphalt shingle roofs?.To learn more about roofs and attics, see these other blog posts: Diagnosing Other Roof ProblemsĪlso, see our blog posts What causes a sagging roof ridge line? and What causes a lump or dip in the roof? and What's the average lifespan of a roof? Visit our blog post Why is my roof sheathing sagging between the trusses? for other possible causes. But, if your roof surface is sagging between trusses, lack of H-clips is only one potential culprit. Also, H-clips reduce any buckling of those edges over time, so they are a good idea even if not always required. If H-clips are missing when you are walking on a roof, it is often discernible by the slight flexing when you step on an unsupported plywood edge. Their installation diagram also shows H-clips, although tongue-and-groove edges or blocking is noted as an alternative in the text above. This is what the APA Engineered Wood Construction Guide has to say about H-clips: One or two H-clips will often allow a longer span between roof trusses/rafters. H-clips are also necessary for other wood panel thickness and span combinations. A low slope roof (below 2/12 pitch) at the same span is an exception, however, and an H-clip is specified. The APA table has a span rating for the sheathing installed with, or without, H-clips, and the span rating is the same both ways. H-clips are referred to in the APA Guide as “edge support."įor the most common roof sheathing in our area, which is 1/2” nominal (7/16” actual) sheathing over trusses or rafters at 24” on center, there is no requirement for H-clips. The International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC) both refer to Table R503.2.1.1(1) of the APA Engineered Wood Construction Guide for specs. Most builders install them, but they are not automatically required for all applications. Some older H-clips do not provide a built-in gap.
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