How To Layout A Roof Rafter

Measure as precisely as possible down to the 1 4 inch 0 64 cm 1 8 inch 0 32 cm or 1 16 inch 0 16 cm.

How to layout a roof rafter. Marking the birdsmouth and the ridge board setback. 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. 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. Facing the long side of your material measure down from the top edge 8.

Here we have a wood framed gable roof. Continuing on from part 3. Draw a line down the edge of the tongue as shown in illustration b of the roof layout. 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.

Use a circular saw or jigsaw to make the cut. 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. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. To lay out a common rafter you need the pitch of the roof expressed in units of rise per foot of run.

Rafter layout and cutting sequence. In the gable roof example shown here a rafter with 6 in 12 pitch rises 6 in. Just share the link. Run is the horizontal distance that the rafter covers.

Use a tape measure to measure the entire width of your building. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. For every foot of run. Layout your sheet of plywood on sawhorses.

Then draw a line across the width of the plywood from that mark. 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. Let s consider a basic gable wood roof framing design. The easy way to lay out and build your rafters.