Roof Joist Thickness

Thickness generally improves floor.

Roof joist thickness.

Loads will vary with the. Depending on loads and spans c joists are typically spaced at 12 16 19 2 or 24 on center spacing. Also available for the android os. This sizing guide for roof rafters will help determine what you need for your small project.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. 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.

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. Structural track usually in the same gauge as the joist is used as rim or band enclosures. When installed however the shingles overlap doubling the thickness. 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. The range of joist sizes used in homes varies though between 2 by 4 inches and 2 by 12 inches. 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.

There are several variables to consider when determining the proper rafter size. Span calculator for wood joists and rafters also available for the android os. Featuring trus joist tji joists for floor and roof applications.