Osb Under Metal Roof

Traditionally metal roofs have used standard 30 pound felt paper underlayment.

Osb under metal roof.

Osb is widely used as roof decking material. April 3 2017 filed under. 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. The only reason to put osb on a roof would be in the case of a very narrow very long very tall building with high wind loads ones which would exceed the wind shear carrying capacity of the steel.

This case is most certainly the exception to the general rule and happens in far less than 5 of all post frame buildings. The best underlayment for metal roofs. Using nominal lumber 1x horizontal underneath and 2x vertical. In order to avoid a hump at the transition from two layers of materials to one the notation on the building plans advises to lower the roof purlins in these areas by 7 16.

Screws will do better than nails. Allen a couple of things to consider. Cross purlin designs with 16 oc are sometimes called for. Metal roofing roofing answers roofing installation roofing materials 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.

You can test fastener pull out resistance. Metal should be installed using a cold roof design so the typical metal assembly would be. The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material. Underlayment must also act as a secondary weather barrier in case the roof fails.