Adding a gable roof addition to your house will require one type of framing.
Perpendicular gable roof addition.
The gable roof on the porch addition was framed with a dropped structural ridge supporting the common rafters above.
To make the blind valleys we attached sleepers to the shed roof locating them.
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Take careful measurements to determine how many trusses you will need.
A cross gable roof is a design that consists of two or more gable roof ridges that intersect at an angle most commonly perpendicular to one another.
Tying a roof perpendicular to the existing roof will be another matter.
Roof failures are often observed on areas of the building where wind pressures are concentrated.
This type of roof is often seen in buildings with a more complex layout for example homes with an attached garage.
These areas include the high pressure eave and corner zones porch and roof overhangs gable ends and where.
First you ll need to determine where your new gable roof will tie into the existing roof.
Joining perpendicular gable roof.
Here we will focus on adding length to the end of a house roof.
Imposed on the roof to the supporting walls below.
Again choosing the easy way out we opted to build blind valleys aka california valleys where one intersecting roof is built on top of the other.
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They form an upside down v with the point at the top of the addition roof.
Either the addition is added to form a t shape to the house with the ridge running perpendicular to the main house roof or the addition is continued on the end of the house making it longer with the ridge running the same way as the existing house.
Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof.