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.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. This sizing guide for roof rafters will help determine what you need for your small project. 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. Structural track usually in the same gauge as the joist is used as rim or band enclosures.

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. 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. There are several variables to consider when determining the proper rafter size.

Thickness generally improves floor. The range of joist sizes used in homes varies though between 2 by 4 inches and 2 by 12 inches. Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. Joist to girder attachments are normally supported with joist hangers easyclip e series or s series support clips.

Span calculator for wood joists and rafters also available for the android os. Another option are 2 x 8 rafters spaced 24 inches o c. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. When installed however the shingles overlap doubling the thickness.

Featuring trus joist tji joists for floor and roof applications. This is the distance between joist centres. Also available for the android os.