H Clips Required Roof Sheathing

Some older h clips do not provide a built in gap.

H clips required roof sheathing. If you re fastening 1 2 inch or 5 8 inch zip system roofing panels to rafters or trusses on the typical 16 inch or 24 inch spacing h clips aren t needed. The typical thickness range for sheathing is 3 8 to 3 4 inch. H clips may also allow builders to use thinner sheathing than they otherwise would be permitted to use. Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Their size should match the thickness of the panels to which they are attached. A builder who uses h clips may need fewer rafters to complete a project because the distance between them can be increased. They are often used with roof sheathing to keep it from feeling spongy or soft at its edges.

This video may depict some work practices that do not meet current safety standards. Sheathing should be a minimum of 19 32 inch thick. In either case the cost of the job is reduced. 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.

Produced by apa the engineered wood association formerly the american plywood association in 1989. Never attach roof sheathing with staples. Always ensure your work site is compliant with current osha regulations. H clips provide additional stiffness between bearing points for the unsupported edges of wood panel plywood or osb roof sheathing along with the necessary 1 8 gap for expansion as shown below illustrated on a bag of simpson h clips.

8d ring shank nails should be used instead. Avoid roof complaints with proper framing sheathing and roofing techniques. 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. Not always required but a good idea.