How To Frame A
How do you frame a gable
overhang? It can be a little tricky for a first timer but it is
actually a fairly simple thing to do.
A normal gable overhang is
usually 12 to 24 inches wide. It is made up of rafters that are
called fly rafters and are constructed of either 2x or 1x
lumber. The fly rafters are usually one size smaller in width
than the rafters used to frame the main roof. If the roof was
framed with 2x8'sthe fly rafters would be 2x6's.
When framing the overhang I
stop the ridge board with the last common rafter. By doing this
I avoid having to cut down and reduce the size of the ridge to
match the plumb cut on the fly rafters. If the common rafters
were 2x8's, the ridge would have to be a 2x10. If the fly
rafters were 2x6's, the 2x10 ridge would hang below the plumb
cut of the fly rafter, putting it in the way of the finish
When cutting the fly rafters
three quarters of an inch must be added to their length to make
up for the missing ridge. This is equal to half the thickness
of the ridge. Four rafters must be cut to make the gable
overhang, two for each side of the gable.
Let's say the overhang is to
be 12" wide and will be made form 2x6. What we build will end
up looking like a ladder. Two 2x6 fly rafters are seperated by
9" 2x6 blocks 24 inches on center. Starting at the bottom of
the plumb cut, the blocks are nailed to the fly rafters and
continue down to at least the birdsmouth cut.
Once the ladder is built they
can be installed against the last common rafter. Before hauling
the overhangs up, I like to start 16 penny nails in between all
the blocking. This is to keep from trying to hold the overhang
in place, and trying to start a nail, all at the same
The overhang is held tight to
the last common rafter on the gable. The top of the fly rafter
is held even with the top of the common rafter. The plumb cut
on the fly rafter should line up with the center of the ridge
board. When all these requirements are met, the overhang is
then nailed to the common rafter. This procedure is then
repeated for the other side of the gable.
The overhangs support
themselves at the top as their plumb cuts lean into each other.
They are nailed together. The bottoms of the overhangs are held
up by being nailed into a 2x subfascia. Additional support is
added when the plywood sheathing is nailed to the common
rafters and onto the overhangs.
Gable overhangs built in this
manner will provide nailing for whatever finish the soffit and
fascia may be, aluminum, vinyl or wood.
More roof framing
The Full Length Roof Framer: The
Cutting Rafters Easily and Efficiently
Frame A Gable RoofHow To Frame A Hip