Why Thickness Of Plywood For Residential Roof

Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins.

Why thickness of plywood for residential roof.

Plywood on the other hand is made with thin sheets of wood that have been cut from a spinning log then glued together. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. So 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.

8d ring shank nails should be used instead. There are several factors to consider. Sheet with varying thickness. The typical thickness range for sheathing is 3 8 to 3 4 inch.

Foot and with a maximum of spacing of 16 inches between rafters. Roofs with very heavy loads may require 3 4 inch thickness. Today a shiplap roof is usually 60 years old. 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.

The industry offers a thickness of anywhere from 5 16 inch to inch. 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. 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. Why re sheet over shiplap.

This kind of plywood can be used on roofs with minimal load. The minimum thickness of plywood used for roofing is 3 8 th of an inch. What plywood should you use for a roof. 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.

After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. Look for something that s graded as exposure 1 or exterior. Most western washington residential homes during this time were built with shiplap roof decks rather than plywood. Regardless of thickness the plywood should be a type suitable for exterior use graded exterior or exposure 1 references.

Plywood typically comes in 4 8 ft. Sheathing should be a minimum of 19 32 inch thick. Especially in relation to osb or plywood use for roofs walls floors. Because 22 24 or 26 gauge sheeting is thicker and will therefore remain more structurally sound over a longer span than a 29 gauge the building needs fewer supports which saves your customers money.

For many applications a layer of plywood underneath your metal roofing is an unnecessary expense.