Why Thickness Of Plywood For Residential Roof

Roofs with very heavy loads may require 3 4 inch thickness.

Why thickness of plywood for residential roof.

Look for something that s graded as exposure 1 or exterior. The typical thickness range for sheathing is 3 8 to 3 4 inch. Plywood typically comes in 4 8 ft. Regardless of thickness the plywood should be a type suitable for exterior use graded exterior or exposure 1 references.

8d ring shank nails should be used instead. This kind of plywood can be used on roofs with minimal load. Osb is made of small and fairly rectangular shaped wood chips from small resinous trees which are bonded into a panel form with wax and synthetic resin. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. So what size plywood should you use for your roof. Never attach roof sheathing with staples. When used for roofing plywood panels are covered and protected by a variety of building materials that keep the elements at bay including roof felt underlayment flashing and shingles.

For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. Sheet with varying thickness. Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. Why re sheet over shiplap.

Sheathing should be a minimum of 19 32 inch thick. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Most western washington residential homes during this time were built with shiplap roof decks rather than plywood. The industry offers a thickness of anywhere from 5 16 inch to inch.

After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. What size plywood should you use for your roof. The most common uses for plywood include support for floors walls roofs and garages in residential construction. Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins.

Plywood on the other hand is made with thin sheets of wood that have been cut from a spinning log then glued together. Today a shiplap roof is usually 60 years old. Foot and with a maximum of spacing of 16 inches between rafters. There are several factors to consider.

Steeper rather than flatter roofs will have lesser load per sq.