Roof Joist Thickness

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Roof joist thickness.

These concentrated loads often include standard steel joists that are in turn supporting steel roof or floor deck. Ceilings directly applied to the bottom edge of the floor members or equivalent 1x or 2x strapping is a. A 2 by 4 inch joist for instance hangs into the room by 4 inches which may leave the ceiling high while a 2 by 12 inch joist in the same position hangs 12 inches into the room which decreases the ceiling height by 8 inches. This is the distance between joist centres.

The roof s main job however is to protect the interior of the house and personal belongings from the outside elements. The difference in the joist sizes applies to the width of the boards which determines the height of the ceiling. Joist girders serve as primary framing members with simple spans to support concentrated loads for a roof or floor system. Thickness generally improves floor.

How thick a roof is depends mostly on the size of the rafters used in the roof construction but there are additional elements including the thickness of the roof sheathing and the thickness of the shingles you choose. Flat roof joist calculator. Usually 400 450 or 600mm but any value can be used up to 610mm max. The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the.