Framin Roof Layout

Rafter layout with a framing square this example is for a roof with an 8 12 pitch position the square at the end of the rafter board with the tongue on your left and facing away from you.

Framin roof layout.

Span is the horizontal distance between the outside top plates or the base of two abutting right triangles. Partially these will depend on the style of roof you ve selected but you ll also have some wiggle room depending on the design elements of the house. Features associated with basic roof framing terms are shown in figure 2 2. To ensure your layout is correct you ll need to set the layout behind the actual 16 increment.

Unit of run is a fixed unit of measure always 12 inches for the common rafter. The framing style of the roof refers to the actual components of each roofing truss and the design of the structural foundation of that roof. Position the square with both the 8 inch on the outside edge of the tongue and the 12 inch on the blade on the upper edge of the board. In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together.

Breaks perfectly on a stud. Meeting current irc roof framing requirements means builders are really constructing very simple triangles using the rafters and ceiling joists because triangles are known to be the most stable shape. This will the first point of the rafter measurement line. Framing gone wrong top and bottom plates.

Measure down y height from the long point of the rafter cut and make a mark. Roof framing rafter layout from one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it.