Why Thickness Of Plywood For Residential Roof

There are several factors to consider.

Why thickness of plywood for residential roof.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Plywood on the other hand is made with thin sheets of wood that have been cut from a spinning log then glued together. Why re sheet over shiplap.

What size plywood should you use for your roof. Especially in relation to osb or plywood use for roofs walls floors. Regardless of thickness the plywood should be a type suitable for exterior use graded exterior or exposure 1 references. The most common uses for plywood include support for floors walls roofs and garages in residential construction.

Sheathing should be a minimum of 19 32 inch thick. 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. Look for something that s graded as exposure 1 or exterior. 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.

Today a shiplap roof is usually 60 years old. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. This kind of plywood can be used on roofs with minimal load. 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.

Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins. What plywood should you use for a roof. Foot and with a maximum of spacing of 16 inches between rafters. Sheet with varying thickness.

Roofs with very heavy loads may require 3 4 inch thickness. Steeper rather than flatter roofs will have lesser load per sq. Never attach roof sheathing with staples. Most western washington residential homes during this time were built with shiplap roof decks rather than plywood.

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. The typical thickness range for sheathing is 3 8 to 3 4 inch. The industry offers a thickness of anywhere from 5 16 inch to inch.

8d ring shank nails should be used instead.