Builders facing the job of framing a
gable dormer generally use one of two
options. Most simply build a header
between two doubled common rafters
from the main roof, and use this to support
the dormer's ridge beam. This
method is especially common for dormers
situated toward the middle of the
roof elevation, which require a lower as
well as an upper header.
Another method is to continue the
dormer's ridge beam through its intersection
with the main roof and hang it
from a metal saddle or wood 2x2s hanging
vertically from the main roof's ridge
beam. But this method compromises
strength and can't be used with vaulted
ceilings.
To get around these limitations, and
to put the load