Square Hip Roofs

Square Hip Roofs

Cutting rafters for a completely square hip roof can be done as easily as any regular pitch
hip roof except for one difference.

Your first common rafter right and left (#1 & #2) must have 3/4" added to it vertically.

This 3/4" addition together acts as a normal ridge board which you would not have and allows
the common rafter front and rear to line up correctly at the top. Otherwise the common rafter
front and rear would appear to be 3/4" low.

As with any hip rafters remember to deduct your normal hip drop so everything lines up
smooth. The outer edges of the hip should be flush with the top of the common rafters to
maintain a smooth flat roof.

Common rafters (#3 & #4)will be cut the exact same diagonal length but do not add the 3/4" to them as shown in figure #7 below.

The main problem with most hip roofs is the walls below or header frame may not be perfectly
square which would make a calculated diagonal hip rafter length too long or too short. This is
why I always add a measured length and would always recommend measuring to avoid
cutting your expensive hip material wrong.

Splaying or spreading problems

You can use steel fasteners readily available on the internet or at your building supply by Simpson strong ties or other manufacturers.

I do recommend using ceiling joist or long wind beams which will prevent splaying in most cases or you can contact a local engineer for alternate solutions.

I can figure the common rafter, hip rafters and all jack rafter Diagonal Lengths for one corner and the other three will be exactly the same.

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Common Rafters

 

Common Rafters

 


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