Roof Joist Thickness

Depending on loads and spans c joists are typically spaced at 12 16 19 2 or 24 on center spacing.

Roof joist thickness.

Joist to girder attachments are normally supported with joist hangers easyclip e series or s series support clips. 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. Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. This is the distance between joist centres.

Structural track usually in the same gauge as the joist is used as rim or band enclosures. Thickness generally improves floor. Ceilings directly applied to the bottom edge of the floor members or equivalent 1x or 2x strapping is a. Another option are 2 x 8 rafters spaced 24 inches o c.

There are several variables to consider when determining the proper rafter size. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. In making your choice consider how you will insulate your insulate your roof. When installed however the shingles overlap doubling the thickness.

Loads will vary with the. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. Span calculator for wood joists and rafters also available for the android os. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Also available for the android os. The range of joist sizes used in homes varies though between 2 by 4 inches and 2 by 12 inches. 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.