Roof Joist Thickness

Span calculator for wood joists and rafters also available for the android os.

Roof joist thickness.

Loads will vary with the. This sizing guide for roof rafters will help determine what you need for your small project. Depending on loads and spans c joists are typically spaced at 12 16 19 2 or 24 on center spacing. When installed however the shingles overlap doubling the thickness.

Also available for the android os. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. The table states that 2 x 6 rafters spaced 16 inches on center o c can span a maximum distance of 13 feet 5 inches. Another option are 2 x 8 rafters spaced 24 inches o c.

Ceilings directly applied to the bottom edge of the floor members or equivalent 1x or 2x strapping is a. Joist to girder attachments are normally supported with joist hangers easyclip e series or s series support clips. Featuring trus joist tji joists for floor and roof applications. Thickness generally improves floor.

This is the distance between joist centres. In making your choice consider how you will insulate your insulate your roof. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

The range of joist sizes used in homes varies though between 2 by 4 inches and 2 by 12 inches. Usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size automatically calculate sizes suitable for supporting the loads below. Though there is no standard joist size for the ceilings in all buildings most average homes use ceiling joists in a board size of 2 by 6 inches.