How To Build A 45 Degree Angle Roof

Screw the square gauge on the tongue at the marker for the slope pitch of the roof or the unit rise.

How to build a 45 degree angle roof.

To determine material quantities you need to do some calculations. Accuracy is key here because miscalculations could lead to major overspending. For each one place the top of the corbel flush with top of the door trim and the side against the side of the door trim and screw into place. The steepest pitch for a roof is 12 12 which creates a 45 degree angle and where the roof vertically rises 12 inches for every 12 inches it goes horizontally.

Screw the gauge in place. Before miter saws and even since professional carpenters used speed squares as a quick saw guide for cutting 45 and 90 degree angles. Set cut angle for rafter place the framing square so the blade is horizontal on the rafter and the tongue is on the rafter and draw lines. Install the corbels next.

Cut a 2 4 board at that length with 45 degree angles on each end. Place the angled pieces inside your l s and screw into place to finish assembling the corbels. Set unit run place the other square gauge at the run unit measurement mark. To measure pitch first position the hypotenuse of the square on the roof running.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. The square also comes with three leveling vials which make it easy to measure the pitch of existing structures.