Recap - The barge rafter extends past the wall of the house, extending the roof, usually on the overhang of a gable. It has a facia board attached to the rafter tails that may be molded or flat. It is important to do good work here, because poor workmanship may mean that the rafters become weathered and rot. Replacing them in the future can be very expensive.
There are two ways to obtain the eave overhang on a gable end. Building a bargerafter is the easiest, as long as the overhang is not over 16 inches. Longer overhangs require sleeper braces.
STEP 1: Cut two long 2x4s with the pitch angle on one end, square on the other end, and make the pair the same length.
STEP 2: Lay out the pair on 24" centers, starting from the point of the pitch angle.
STEP 3: Cut 2x4 blocks to the length of overhang you want. Remember to allow for the 3" of the side boards.
STEP 4: Nail the blocks to the long pair on the center marks.
STEP 5: Add a block at the bottom end and the top end. Position the top end block so that it does not hang out past angle cut on the top end of the long pair.
STEP 6: Install the barge at the top of the roof on each side of the ridge. Match the peak of the barge to the center point of the ridge board. Nail thru the inside board of the barge to the rafter. Space the nails about every 12 inches.
STEP 7: Measure the remaining length required from the lower end of each barge and the rafter tail.
STEP 8: Build the lower "b" rafters to size and install them. Cut the lower end of the last section with the pitch angle to match the rafters.
Now you have successfully built your barge rafters for your new home! more text coming...