Osb Under Flat Roof

Dear pole barn guru.

Osb under flat roof.

That s considered to be the minimum. When you count sub floors roofs and wall sheathing osb claims about 70 of the wood sheathing market in north america over plywood. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Osb is widely used as roof decking material.

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

If your roof is more on the flatter side then it s expected to have a heavier load. With edge support and the same snow load 3 8 inch osb can be used. 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. However you may need to consider bolstering the plywood thickness for a roof that has a higher load.

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. Adding osb is good when one is going to install insulation. Odds are that if you pass a housing development of wood framed houses it will have osb oriented strand board as exterior sheathing. 5 thoughts on osb under steel roofing on pole buildings kamel may 3 2018 at 11 22 am.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. This prevents thermal changes and will reduce condensation. I m planning on building a pole barn using 3 1 2 inch schedule 40 pipe as my frame. I found some pre made 4 inch pipe trusses.

Thicknesses range from 5 16 to 3 4 inch and the proper. 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. Most roofs are spaced at least 20 inches apart.