Is Plywood On Roof Needed

It will support roof loads for most situations and is the standard for most roof applications.

Is plywood on roof needed.

If you can see original wood shingles on the underside of your roof when you re up in the attic you ll need not only to tear everything off but also to install new plywood decking all of which likely adds 5 000 or more to your costs. While it s not the main material for the roof itself roofing plywood is an important part in a roofing structure. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. Most construction sites will consider the use of either osb or plywood for the roof.

Sheathing sizes 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. Considering when to use plywood. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it.

Even though it isn t visible it is very important to the structure of your home. The tear off gets a lot more complicated if you have something other than asphalt up there. One sheet 32 ft. This basically calculates the number of sheets needed for a gable roof.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Cdx plywood is a construction grade type of plywood that is designed for exposure to the elements. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. What kind of plywood for the roof.

A 4 8 sheet of plywood is 32 ft 2. When it comes to choosing what kind of plywood you need for the roof it is important to understand the basic categories that you can choose from. It s so important that you have to arm yourself with knowledge and know everything there is to know so you ll know the best way to utilize it for your roof. So dividing the area of the roof by 32 will give you the number of sheets needed.

Modern metal roofs are expected to last 30 years or longer. While metal roofing doesn t require plywood underlayment there are circumstances in which you may wish to install plywood to anticipate future roofing needs or to offer additional soundproofing. Sometimes referred to as roof sheathing or a roof deck this plywood acts as a foundation for the layers of underlay and the shingles on your roof and connects the roof to the frame of the house.