Osb Thickness Flat Roof

Osb roof decking thickness 7 16 1 2 or 5 8.

Osb thickness flat roof.

Installed correctly allowing falls to roof using per furring. Current standards also permit swiss krono osb to be used as outer boarding in flat roof constructions. Should we replace the entire roof with new materials 9. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.

Oriented strand board osb osb is a type of wood panel comprising of timber strands and should be manufactured in accordance with bs en 300. Osb a sterling board. Laid with staggered joints. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24.

Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. Large rooftops can be realised much more quickly and easily this way than with conventional boarding. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. Impervious to any waters ingress.

In this case you can t use a 3 8 inch thick sheet. Once the spacing hits 24 inches a 5 8 inch thick sheet is more ideal. Sufficient thickness 18mml. Osb boards used for the deck should be.

However you might find that osb can better suit your needs than plywood for the roof. A minimum thickness of 18mm these will be able to span up to 600mm. With edge support and the same snow load 3 8 inch osb can be used. Most roofs are spaced at least 20 inches apart.

We re in dallas so we don t engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16 oc rafter spacing and 7 16 osb decking. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Double nailed at each joist. A minimum thickness of 22mm is recommended.

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. Fortunately this is one issue that has primarily been standardized by the industry. It can be sealed with bitumen or membrane and covered with zinc sheeting or slate roofing. For this you can either go for a half inch or 5 8 inch thick sheet.