How To Cut Roof Angles

This video will show you how to figure length and cut a common rafter for a gable roof using a framing square.

How to cut roof angles.

W x cosine horizontal inches to add from short point to long point of the cut angle from the bottom to the top of the. The number of rafters needed will be determined by the length of your roof. An angle cut is a very common cut needed for constructing rafters for any roof. Use a square to mark a line up into the board 6 inches from the center of one end.

You will need to make 22 5 degree angle cuts on the rafter joist ends that mate up to the top plate or header. Cut the end of a fourth piece using the same angle from the upper cords. Depending on the size of your structure you will need to cut several or many more. At this point you ve cut 1 roof rafter.

Angle the angle of a roof is the same as the roof s slope except instead of being represented as x 12 it is represented in degrees. All roof rafters should be identical so follow the same steps to measure the plumb cut tail cut and birdsmouth cut. 45 degrees where the joists meet up with the top plate or header and 90 where the joists meet in the middle at the ridge board. Since the sum of the three angles in a gambrel roof is 180 degrees the angles you will need are as follows.

To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Flip the board to the opposite corner and cut again so that the angles meet in a peak on the center line you drew. W ll factor horizontal inches to add from short point to long point of the cut angle from the bottom to the top of the sheathing.

Cut off one corner of the board at the angle you have set. Find the common rafter incline degree of the unit rise to unit run. Roof pitch is a term describing how steep or flat your roof slope is. Roof pitch angle and slope factor charts.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.