Adjustable Quick Square 170mm (6.3/4in)

Product Information

CUT ROOFING IS EASY IF YOU KNOW THE BASICS, FIRST THING NOT MENTIONED HERE IS ANGLES..IE COMMON 40 DEGREE ROOF PITCH... Faithfull 'Prestige' products are manufactured to the highest standards and are covered by a 10-year guarantee.

So a 20 foot wide building with a 40 degree pitch = 40 d ridge angle and 50 d seat angle (wall plate) just square off the 50 d to get the bird mouth ( 1/3 depth of rafter).

START WITH 90 DEGREES SO A 40 D PITCH ROOF= 40d PLUMB/ TOP/ RIDGE CUT, THE SEAT CUT WILL BE 50 DEGREES ( 40D +50D=90DEGREES).