Osb Thickness Flat Roof

Fortunately this is one issue that has primarily been standardized by the industry.

Osb thickness flat roof.

In this case you can t use a 3 8 inch thick sheet. 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. Osb roof decking thickness 7 16 1 2 or 5 8.

Current standards also permit swiss krono osb to be used as outer boarding in flat roof constructions. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Laid with staggered joints. Sufficient thickness 18mml.

Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. With edge support and the same snow load 3 8 inch osb can be used. A minimum thickness of 18mm these will be able to span up to 600mm. Once the spacing hits 24 inches a 5 8 inch thick sheet is more ideal.

Impervious to any waters ingress. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. Should we replace the entire roof with new materials 9. 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. Currently we space rafters 16 oc and use 7 16 osb with h clips. However you might find that osb can better suit your needs than plywood for the roof. Flat roof requires maintenance for a small leak in the middle of ceiling.

Osb boards used for the deck should be. 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. Installed correctly allowing falls to roof using per furring. Most roofs are spaced at least 20 inches apart.

A minimum thickness of 22mm is recommended. Osb a sterling board. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. 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.