![]() ![]() Moreover, the movements can create invisible waves and bumps on the roof, leading to poor water drainage and, eventually, roof leaks. Without the “spacers,” the roof deck can buckle due to the natural expansion and contraction of the wood. ![]() Stiffening the boards with plywood clips substantially increases the weight-bearing capacity along the edges, reducing the risk of bowing.Īdditionally, thanks to the full-width spacer bar, H clips leave a 1.8-inch gap that allows sheathing to expand, thus preventing warping. So, the panels often bow when subjected to excessive weight, such as when a roofer walks along the edges. Unfortunately, 3/8-inch plywood is not strong enough to bear substantial weight. As a result, the stiffer panel edges are unlikely to experience structural defects when subjected to heavy loads near the edges.įor instance, many people use 3/8-inch plywood sheathing for standard roofing applications. The main purpose of H Clips is to increase panel stiffness, enabling better load distribution between adjacent panels. Doing so increases panel stiffness and ensures greater weight distribution, as adjacent sheathing panels share any load at the seam. The clips are placed at the center of the span (the distance between two perpendicular/vertical framing members), especially under roof shingles. They create a connecting point along with a vital 1/8-inch gap for expansion and contraction between adjacent panels on roofs at unsupported edges perpendicular to roof trusses or rafters. What are H-Clips?Īlso known as panel edge clips or plywood H clips, H Clips are metal clips that hold adjacent wood panels together while providing an expansion gap. They also reduce construction costs by reducing the required materials, particularly vertical framing members. Typically made of steel, they sit snugly between sheathing panels to provide edge support while leaving a vital 1/8-inch expansion gap. H-Clips are tiny metal pieces featuring cutouts designed to hold together two pieces of adjacent decking boards. We’ve created this brief guide to help you better understand H-clips and learn when and how to use them for stronger roof decks and more durable roofs. Unfortunately, many roofers overlook them even where they can be crucial. Better known as H-Clips, panel edge clips are commonly used between adjacent wood sheathing pieces between supporting trusses or rafters to provide additional stiffness at the panel edges. ![]()
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