How To Layout A Roof Rafter

Let s consider a basic gable wood roof framing design.

How to layout a roof rafter.

Measure the diagonal of the rafter. Stepping off the rafter. Here we have a wood framed gable roof. Do not download and re upload this video.

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 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 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. Position the framing square to make the birdsmouth cut.

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 circular saw or jigsaw to make the cut. Start this measurement from the top the long end of the cut you just made.

This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home. Clamp stair gauges to the framing square to align rise and run measurements with the rafter s top edge. 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. Marking the birdsmouth and the ridge board setback.

Layout your sheet of plywood on sawhorses. Rafter layout and cutting sequence. Align the framing square so that the stair gauge that you ve. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

The right angled notch that fits over the top of the wall is called a. 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. Learn the 1 rafter design that will guarantee your roof that is safe and strong for years to come. 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.

Discover the pros and cons to multiple roof designs. 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. Start at the ridge. Just share the link.

The easy way to lay out and build your rafters. Then draw a line across the width of the plywood from that mark. Measuring and marking the birdsmouth and tail cuts 1. Facing the long side of your material measure down from the top edge 8.