Osb Under Flat Roof

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 and roof design.

Osb under flat roof.

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. Thicknesses range from 5 16 to 3 4 inch and the proper. Osb is widely used as roof decking material. I m planning on building a pole barn using 3 1 2 inch schedule 40 pipe as my frame.

A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain snow and ice to roll right off. I found some pre made 4 inch pipe trusses. 5 thoughts on osb under steel roofing on pole buildings kamel may 3 2018 at 11 22 am. However you may need to consider bolstering the plywood thickness for a roof that has a higher load.

Most roofs are spaced at least 20 inches apart. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. When you count sub floors roofs and wall sheathing osb claims about 70 of the wood sheathing market in north america over plywood. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

Mike the pole barn guru. That s considered to be the minimum. This prevents thermal changes and will reduce condensation. Then the top of all your purlins once osb under metal roof panels is placed will be in the same plane and the roof steel will lay flat.

Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. If your roof is more on the flatter side then it s expected to have a heavier load. Odds are that if you pass a housing development of wood framed houses it will have osb oriented strand board as exterior sheathing. With edge support and the same snow load 3 8 inch osb can be used.

A homeowner recently wrote and asked me the following regarding osb roof decking. This minimum wouldn t work if you have a flat roof. Dear pole barn guru.