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roof pitch

roof pitch

#1
10-27-06, 03:46 AM
Member
Join Date: Oct 2006
Posts: 2
roof pitch

i know how to find a roof pitch on an existing roof but how do i determine how high to put the center board to get a 4 or 5/12 pitch

#2
10-27-06, 08:17 AM
Member
Join Date: Feb 2006
Location: USA
Posts: 6,402
Roof Pitch

Give us the horizontal distance from the outside of the top plate to the center and we can give you a measurement.

#3
10-27-06, 08:56 AM
Member
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 17,505
Received 1 Upvote on 1 Post

Id have trusses made. Cost less then to do it your self

#4
10-28-06, 03:51 AM
Member
Join Date: Oct 2006
Posts: 2
roof piech

Originally Posted by Wirepuller38
Give us the horizontal distance from the outside of the top plate to the center and we can give you a measurement.
the distance is nine feet,the building is ezactly 18x18 with 8 feet to the top of the sill

#5
10-28-06, 04:58 AM
Member
Join Date: Feb 2006
Location: USA
Posts: 6,402
Roof Pitch

This is easy. A 4/12 pitch means the height is 1/3 of the horizontal distance. You need the top of the ridge board to be 3 feet above the top of the rafter at the point where the rafter sets on the top plate. ( 3 ft. plus the thickness of the "birds mouth")

For a 5/12 pitch the height difference changes from 36 inches to 45 inches. (108/12 x 5 = 45). Hope this helps. Cut a trial run out of scrap material, temporarily nail it in place, and check the pitch. Hope this helps. Good luck.