Roof Joist Thickness

Featuring trus joist tji joists for floor and roof applications.

Roof joist thickness.

The full version allows any size. 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. These concentrated loads often include standard steel joists that are in turn supporting steel roof or floor deck. This demo version is fixed at 1m clear span.

This is the distance between joist centres. Ceilings directly applied to the bottom edge of the floor members or equivalent 1x or 2x strapping is a. Thickness generally improves floor. Flat roof joist calculator.

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. The difference in the joist sizes applies to the width of the boards which determines the height of the ceiling. The roof s main job however is to protect the interior of the house and personal belongings from the outside elements. Usually 400 450 or 600mm but any value can be used up to 610mm max.