Use Roof Pitch To Cut Rafter Tails

First determine the width of the building the rafter span and the length for the number of rafters that will be needed.

Use roof pitch to cut rafter tails.

There are two typical fascia angles in home construction. Measure the edge of the roof. If it rises only 6 for every 12 it s a 6 12 pitch. 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.

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. This was then foamed to complete the air seal. Mark the cut line on the side face of each rafter tail. 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.

Then divide the span by two to get the rafter run the length each rafter must cover. Cut pieces so that the end joints between pieces fall in the center of a rafter tail. For a 24 foot wide building the run would be 12. The pitch is defined as the vertical distance a roof rises in each horizontal foot.

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 measure or figure rafter length and mark and cut them accurately. Choose or determine a pitch the angle at which the rafters rise. When framing a gable or hip roof the final step is cutting the rafter tails for fascia board.

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. If the slope rises 6 inches in each horizontal foot the pitch is referred to as 6 in 12 or a 6 12 pitch. Use a tape measure to measure the entire width of your building. Cut 1 by 6 inch lumber to fit along the ends of the rafters from one end of the roof to the other.

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. Use two nails in the end of each rafter. Go back and check out photograph 10. In this video you will learn all about common rafters.

The traditional method has been rise inches 12 run inches. For every 3 cm of run. Work from the scaffold and measure the distance from the upper end of the cut rafter to the point where the fascia meets the roof sheathing. Some architectural designs call for plumb or vertical cuts as opposed to square cut 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.