Roof Framing Rafter Layout

On the tongue of the square and 12 in.

Roof framing rafter layout.

For every foot. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home. Laying out hip valley and jack rafters takes experience and skill but if you re building a simple gable or shed roof all you need is the common rafter the basic building block of roof framing. Discover the pros and cons to multiple roof designs.

Learn the 1 rafter design that will guarantee your roof that is safe and strong for years to come. Subtract the width of your ridge beam. In this case i attach the gauges for a 6 12 pitch 6 in. Before you start cutting you first need to determine how long your roof rafters.

The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. Position the square at the end of the rafter board with the tongue on your left and facing away from you. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. On the body of the square.

Measure up a distance equal to 25 of the width of the rafter as shown in illustration c and put a mark. Let s consider a basic gable wood roof framing design. The layout the next step is to layout and cut the rafter. The ridge beam is the vertical piece of plywood which will form the peak of.

Measure down y height from the long point of the rafter cut and make a mark. Divide the adjusted width. Here we have a wood framed gable roof. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Calculating rafter length 1. Mark and cut the first rafter ends the first step in building the roof rafters is to cut one rafter board to length with the ends angled properly and then to mark and cut the birds mouth and seat on the rafter. This will the first point of the rafter measurement line.

Flip the square over and place the tongue along the line made in illustration b. To lay out a common rafter you need the pitch of the roof expressed in units of rise per foot of run in the gable roof example shown here a rafter with 6 in 12 pitch rises 6 in. Continuing on from part 3. Add the length of the overhang beyond this mark and.

First i attach a set of stair gauges to my framing square so i can make precise repetitive marks. Measure the width of your building. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Draw a line down the edge of the tongue as shown in illustration b of the roof layout.