Use Roof Pitch To Cut Rafter Tails

Aligning with the overhang chalk line use a hand square to mark the cut line for a square fascia application or use a level to mark the plumb cut for the rafter tails.

Use roof pitch to cut rafter tails.

Cut 1 by 6 inch lumber to fit along the ends of the rafters from one end of the roof to the other. Go back and check out photograph 10. The metric method for slopes less than 45 degrees shows the first number as 1 all the time so a 1 3 slope would mean a rise of 1 cm. When framing a gable or hip roof the final step is cutting the rafter tails for fascia board.

Cut pieces so that the end joints between pieces fall in the center of a rafter tail. Mark the cut line on the side face of each rafter tail. For every 3 cm of run. 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.

For a 24 foot wide building the run would be 12. So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch. Use a tape measure to measure the entire width of your building. On the front of the roof edges the original roof deck sheathing was cut back flush with the wall and the fully adhered membrane folded down around the rafter tails to catch the wall water control layer and air control layer.

Step 2 place a 2 by 6 board on sawhorses to lay out the first full length or common rafter. The traditional method has been rise inches 12 run inches. How to measure or figure rafter length and mark and cut them accurately. Use two nails in the end of each rafter.

Measure the edge of the roof. If it rises only 6 for every 12 it s a 6 12 pitch. This was then foamed to complete the air seal. First determine the width of the building the rafter span and the length for the number of rafters that will be needed.

Some architectural designs call for plumb or vertical cuts as opposed to square cut tails. Then divide the span by two to get the rafter run the length each rafter must cover. The pitch is defined as the vertical distance a roof rises in each horizontal foot. Transfer this measurement to the piece of framing.

Choose or determine a pitch the angle at which the rafters rise. Plumb or vertical with the fascia installed vertically parallel with the exterior wall surface and square with the fascia installed perpendicular to the roof pitch. Nail these pieces starting at one end of the roof butting each piece flush to the one before. If the slope rises 6 inches in each horizontal foot the pitch is referred to as 6 in 12 or a 6 12 pitch.

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.