Osb Vs Cdx Roof

Osb does not do well when it gets wet.

Osb vs cdx roof.

Cdx plywood is a construction grade type of plywood that is designed for exposure to the elements. Oriented strand board osb combines wood chips glue and resin into the shape of a sheet of plywood and bakes them together. Each of these materials has its own unique properties and qualities and so each is used in specific applications. Because of this manufacturing process osb is at least half the cost of cdx plywood.

It is made of multiple layers of thinly cut solid sheets of wood that are pressed together. Compared to cdx oriented strand board osb is made very differently. Although osb typically offers a higher shear rating which adds rigidity to your structure. It is often less expensive than cdx plywood because this manufacturing process doesn t require the same costly veneers found on the front and back of cdx plywood.

It is made of wood chips and glue. Most construction sites will consider the use of either osb or plywood for the roof. Cdx is best for sub flooring. Cdx and osb are used for almost similar things but because they have different features one is better applied in some tasks and the other one on other tasks.

My personal opinion is that osb performs well on the wall and floor but stick to cdx plywood on the roof. Odds are that if you pass a housing development of wood framed houses it will have osb oriented strand board as exterior sheathing. Over the years i have seen claims for plywood decking delaminating which can cause squeeks and knocks between the ply s. Osb is a cheap imitation of cdx.

How do cdx and osb differ in performance. Osd plywood osd and cdx plywood are both commonly found on construction sites because builders and contractors rely on both types of plywood to get the job done. It is usually made of 4 by 8 sheets that should be 1 2 thick. The roof deck is the surface underneath your roof and roofing underlayment.

Osb is made by combining glue resin and wood chips and pressing them into the shape of a plywood sheet then baking everything together. It is also used for roof sheathing. We have used osb for some time now we use 5 8 on the roof 7 16 on the sidewalls all with plywood clips for strength and proper exspansion gaps however 3 4 t g ulc or cdx for floors stands up to the weather while building. New homes will usually see a few rainfalls before a roof is on and as.

When you count sub floors roofs and wall sheathing osb claims about 70 of the wood sheathing market in north america over plywood. In such places it does not get in contact with a lot of moisture which prevents it from getting damaged. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. My personal opinion is that osb performs well on the wall and floor but stick to cdx plywood on the roof.

Far too often i see osb sag between the trusses making your roof look wavy.