Roof Sheathing Material Thickness

I ve never used commodity osb on a roof but it s probably fine in 5 8 thickness and possibly in 1 2 thickness.

Roof sheathing material thickness.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. As per code in my area ottawa canada i plan on using 3 8 plywood for sheathing. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. If you re in search of quotes for a roof sheathing job improvenet can put you in touch with up to four local contractors for free.

Correct installation of roof sheathing will ensure the best performance and help reduce complaints and callbacks. Cdx works fine in 1 2 or 5 8 thickness. For information on large panelized roof systems refer to the commercial construction application section. Many code requirements are not inspected.

The roof covering will be asphalt shingles. And for wood structural panel sheathing r803 2 2 allowable spans. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing.

It also holds roofing nails well. That s considered to be the minimum. Several factors must be considered when determining appropriate roof sheathing thickness such as the. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Required sheathing thickness for roofing important factors. Roof sheathing materials plywood. Comes in standard 4 by 8 foot sheets is strong durable and relatively light. Common roof sheathing applications and installation recommendations are described in the related publications listed at right.

And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity. I just read somewhere actually in taunton press roofing with asphalt shingles book that one should consider using sheathing thicker than code to avoid sagging between rafters. Loads will vary with the. Steeper roofs tend to have thinner sheathing due to not much weight being applied to the roof while flat and low sloop roofs that are likely to gather weight from precipitation or people walking on it.

It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads. The common grade of plywood for roof sheathing is cdx. Sheathing comes in different thicknesses and what type of roof you have will help designate what type of thickness you need. Malcolm i almost always use 5 8 zip sheathing on roofs and metal roofing installers have never questioned it.