Roof Lookout Spacing

The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.

Roof lookout spacing.

Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. At the rakes a double row of fillers between lookout rungs are laid in top surfaces offset by the small fraction the outer row picks up the t g boards the inner row the osb. A lookout lookout rafter or roof outlooker is a wooden joist that extends in cantilever out from the exterior wall or wall plate of a building supporting the roof sheathing and providing a nailing surface for the fascia boards. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support.

505 creating a sip roof assembly. 1030 automatic framing exposed. Or the crazy framers who sheath the roof with 7 16 sheets. Setting truss lookout spacing and viewing selected truss details training videos setting truss lookout spacing and viewing selected truss details.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. The same goes for using 1x pine as a sub fascia then wrapping with aluminum. If i were to omit the subfascia in favor of simply using a 4 4 finish grade fascia board then i would insist on using the lookouts to stabilize the rafter tails. Learn how to adjust lookout on center spacing for lookouts and view truss details in this video.

When not exposed it serves to fasten the finish materials of the eaves. With or without subfascia.