Osb Flat Roof Deck

Oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands.

Osb flat roof deck.

Thickness and fixing recommendations are similar to those for plywood. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. Suitable for use with all bauder systems wood particle board chipboard.

The material used for the roof deck must be moisture resistant and will usually be plywood osb or timber boards although concrete and woodwool slab or profiled metal can also be used. A homeowner recently wrote and asked me the following regarding osb roof decking. Osb used for flat roof decking should be type osb 3 or osb 4 conforming to bs en 300. Panel selection should be made according to the category of use given in table 1 below.

Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Ordinary chipboard is not recommended as it may absorb moisture when damp and lose its structural integrity. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot. Osb flat roof decks should be designed in accordance with bs 6229.