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Hip rafter
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HIP RAFTERRIDGEBOARD
BACKING, BEVELLING, DROPPING
THE HIP ROOF - 1
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
N.B. RUN is horizontal travel of the rafter or the base of the right triangle.
CR unit run = 12”
HR unit run = 16.97” (17”)
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
N.B. The common rafter (CR) is shortened by ½ the thickness of the ridgeboard and the Ridgeboard is
lengthened, on each end, by ½ the thickness of the CR
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
Given: Building 18’ x 28’. Roof slope 4 in 12, roof projection 16”Calculations: Span = 18’; Run = 9’
Using the Framing Square Tables:-
Line 1: Unit Common R. = 12.65”, LLCR = 12.65 x 9 = 113.85” = 9’
5⅞”
Line 2: Unit Hip R. = 17.44”, LLHR = 17.44” x 9 = 156.96” = 13’
15/16”
Line 3: Common Difference (16”o.c.) = 16⅞”, LLHJR#1 = (9’ 5⅞” – 1’
4⅞”)
LLHJR#1 = 8’ 1”
Line 4: Common Diff. (24”o.c.) = 255/16”, LLHJR#1 = (9’ 5⅞” – 2’
15/16”)
LLHJR#1 = 7’ 39/16”
Line 5: Side Cut of Jacks = 12” & 11⅜”
Line 6: Side Cut of Hip or Valley = 12” & 1111/16”
In the next slide, line 6 is replaced by simply shortening the 1st ridge
plumb line by 11/16” (½ the 45 thickness of the hip rafter or the
diagonal of a ¾” square), and then by a further ¾” for ½ the thickness
of the hip rafter stock. The line is cut with the bevel of the circsaw set
at 45.
CARPENTRY, 2ND Canadian Ed., Vogt F. & Nauth M., Nelson Education, 2013
The slot in the speed square has numbers above for the unit rise for the hip rafter and it has numbers below for the unit rise for the common rafter. Once the angle is set to be marked off, the degrees are read at the bottom edge.
