What Plywood To Use On A Flat Roof

Why is plywood used in roofing.

What plywood to use on a flat roof.

Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. It is formed from multiple layers of wood bonded together with a glue and the grains run in alternate directions through each layer which ensures the board s strength is. This plywood is strong and durable enough for use in roofing framing and other exterior structural. 5 ply is a versatile type of plywood that is about 4 millimeters thick.

The minimum plywood for roofing. Never attach roof sheathing with staples. Although the roof structure takes the majority of the weight plywood needs to be able to support the rest of the roofing system. Up until 2000 plywood held the majority of the market for wall roof and floor sheathing when it was surpassed by osb which as of 2018 held about 75 of the market share.

Look for something that s graded as exposure 1 or exterior. The industry offers a thickness of anywhere from 5 16 inch to inch. In addition to the thickness you also need to make sure that you choose plywood that s graded for outdoor use. Rafters run from the peak of the roof.

Roofing can also be improved by using extra insulation and fresh single ply membranes the effects of an extra insulation will be experienced by the cooler temperatures that will be enjoyed in the interior during the summer and the use of the single ply will definitely prolong the life span of the roof. What plywood should you use for a roof. Plywood boards used for the deck should be. Plywood is made with an odd number of layers for optimal strength and performance.

Plywood for a roof deck should be of marine grade and suitable for external use to bs en 636 or a bond class 2 or better complying with bs en 314 check. Multi ply is a catchall term for plywood with seven or more plies. What size plywood should you use for your roof. Use it indoors or outdoors but avoid using for framing permanent structures such as a shed or a home.

Sheathing should be a minimum of 19 32 inch thick. A minimum thickness of 18mm these will be able to span up to 600mm. The typical thickness range for sheathing is 3 8 to 3 4 inch. 8d ring shank nails should be used instead.

In roofing plywood is often selected due to its strength.