Osb Under Flat Roof

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood.

Osb under flat roof.

That s considered to be the minimum. Adding osb is good when one is going to install insulation. Dear pole barn guru. 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.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. This minimum wouldn t work if you have a flat roof. Odds are that if you pass a housing development of wood framed houses it will have osb oriented strand board as exterior sheathing. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load.

When you count sub floors roofs and wall sheathing osb claims about 70 of the wood sheathing market in north america over plywood. I found some pre made 4 inch pipe trusses. A homeowner recently wrote and asked me the following regarding osb roof decking. Mike the pole barn guru.

Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. I m planning on building a pole barn using 3 1 2 inch schedule 40 pipe as my frame. This prevents thermal changes and will reduce condensation. Most roofs are spaced at least 20 inches apart.

If your roof is more on the flatter side then it s expected to have a heavier load. 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. Osb is widely used as roof decking material. With edge support and the same snow load 3 8 inch osb can be used.

5 thoughts on osb under steel roofing on pole buildings kamel may 3 2018 at 11 22 am. Thicknesses range from 5 16 to 3 4 inch and the proper. However you may need to consider bolstering the plywood thickness for a roof that has a higher load.