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.

If your roof is more on the flatter side then it s expected to have a heavier load. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. Most roofs are spaced at least 20 inches apart. With edge support and the same snow load 3 8 inch osb can be used.

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. A homeowner recently wrote and asked me the following regarding osb roof decking. Odds are that if you pass a housing development of wood framed houses it will have osb oriented strand board as exterior sheathing. I found some pre made 4 inch pipe trusses.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. 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. This minimum wouldn t work if you have a flat roof. 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.

This prevents thermal changes and will reduce condensation. That s considered to be the minimum. Mike the pole barn guru. Adding osb is good when one is going to install insulation.

Dear pole barn guru. 5 thoughts on osb under steel roofing on pole buildings kamel may 3 2018 at 11 22 am. 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 is widely used as roof decking material.

Thicknesses range from 5 16 to 3 4 inch and the proper. When you count sub floors roofs and wall sheathing osb claims about 70 of the wood sheathing market in north america over plywood. I m planning on building a pole barn using 3 1 2 inch schedule 40 pipe as my frame.