How To Build A 45 Degree Angle Roof

Screw the gauge in place.

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. 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. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. The square also comes with three leveling vials which make it easy to measure the pitch of existing structures.

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. Set unit run place the other square gauge at the run unit measurement mark. Install the corbels next. To determine material quantities you need to do some calculations.

Photo 2 shows how to use the speed square to mark a 33 1 2 degree angle the same as you would need on a rafter tail for a roof with an 8 12 pitch. Place the angled pieces inside your l s and screw into place to finish assembling the corbels. Accuracy is key here because miscalculations could lead to major overspending. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

You can make the 20 degree cut following the set angle flip the tool over and make the complementary 70 degree cut to create a perfect 90 degrees. Cut a 2 4 board at that length with 45 degree angles on each end.