Carpentry 2: Hip Roofs Part A
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Why is the hip roof considered to be one of the strongest roof styles?
The rafters brace the roof in 4 directions
On a hip roof, what are the 2 extra common rafters called?
End common rafters or pin rafters
The hip rafter and the common rafter have the same _____
What is the shortening of a hip rafter at the upper end?
Half the diagonal thickness of the common rafter
What is the shortening of a hip rafter at the lower end?
Full diagonal thickness of the fascia
What type of cut is required at either end of a hip rafter?
Double cheek cuts
Describe the correct way to measure a shortening from the working plumb line.
Shortenings are horizontal and must be measured perpendicular to any plumb lines. They cannot be measured on the edge of the material, which will be a sloping surface.
To lay out the cheek cut plumb lines, how far should you measure back or ahead of the shortening plumb line?
- The plumb line for cheek cuts is always half the thickness of the rafter being laid out, measured from the shortening plumb line.
- This applies to any rafter meeting another at an angle and to any thickness of rafter.
Why would a level cut be required at the lower end (fascia end) of the hip rafter?
It is important to check on the size of material to be used for fascia to ensure that the bottom of the rafter tail does not protrude below it. This may happen if the fascia is relatively narrow, as in the case of 2x4 fascia and 2x6 rafter stock.
When first laying out the seat cut for a hip rafter birdsmouth, what determines the wood above plate measurement?
The wood above the plate should be identical to the common rafter
What must happen to the hip rafter so that it does not interfere with the roof sheathing?
Dropped or backed
Describe the layout for dropping the hip.
- Measure half the rafter thickness back (toward the ridge) from the working plumb line.
- This provides a new location to measure down the wood above plate.
- This determines the correct amount of drop.
What is 'backing' the hip?
The process of beveling the top edges of the rafter
When would a square cut be used for the birdsmouth plumb cut and when would double cheek cuts be used?
- Box cornice - cut square
- Open cornice - double cheek cut
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