Good Morning Friends,

When framing in a hip roof how many common rafters or trusses will be in that hip installation?

None if the hip hit the ridge.

one if its a dutch hip

 

jack

English machines

Good Morning Jack,

How true you are for one common in the middle of the structure gives the last common rafters/truss the bracing need to assure for good layout of the jack rafters/trusses.

It is a rare site to see the Dutch hip roof  and some might not know what you are referring to so I'll try to explain. A dutch hip roof is one where the ridge board extends past the last common rafters or truss and the framing member comes back to the rafters or truss mostly on a 45º angle extending the roof sheathing to give protection to the vent in the end wall in the case of a storm that could allow moisture into the attic. Other than that it offers no form of strength to the roof supports.

Ralph

there are a few variation on the dutch hip so it is not fully accurate that a dutch has one common.

the dutch Hip   variation of a standard hip with a small gable section at the peak is the one with a  hip ending on a common rafter . The small gable can provide an attractive alternative to the standard hip as well as provide room for additional ventilation. How to calculate a Dutch Hip would be a good question.

 

jack

English machines