How To Layout A Roof Rafter

Before you start cutting you first need to determine how long your roof rafters need to be and the angles at which you ll cut the top and bottom of the rafter.

How to layout a roof rafter.

Place the square as before aligning the 6 mark of the tongue and 12 mark of the body with the top edge of the rafter material. Use a circular saw or jigsaw to make the cut. Let s consider a basic gable wood roof framing design. 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.

The easy way to lay out and build your rafters. Marking the birdsmouth and the ridge board setback. 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. For every foot of run.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. To lay out a common rafter you need the pitch of the roof expressed in units of rise per foot of run. Just share the link. Layout your sheet of plywood on sawhorses.

Continuing on from part 3. Rafter layout and cutting sequence. We need to adjust the total run 73 inches in our example by subtracting 1 1 2 inches the full thickness of the ledger adjusted run 71 1 2 inches. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Align the back edge of the tongue with the 187 7 8 mark. Use a tape measure to measure the entire width of your building. Draw a line down the edge of the tongue as shown in illustration b of the roof layout. On a shed roof rafter run is the distance from a ledger on the main building to the outside of an addition wall or porch carrying beam.

Then draw a line across the width of the plywood from that mark. Facing the long side of your material measure down from the top edge 8. Here we have a wood framed gable roof. Do not download and re upload this video.