Posted by JWmHarmon on February 22, 2003 at 12:45:44:
Garage gable end roof framing:
One way to achieve an overhanging eave on the gable end of a roof is to construct the end truss different from the rest of the trusses. This overhanging eave is sometimes called an "extended roof rake." The top chord of the end truss is constructed so that it matches the bottom edge of the top chord of the other roof trusses. It is made with no rafter tails (the part that overhangs on the sides of the garage).
A ladder-like framework is then constructed so that the parts that correspond to the rungs of the ladder are perpendicular to the trusses. This framwork is nailed to the next truss in from the end truss and toe-nailed to the top chord of the end truss. For heavy snow laods metal connectors are sometiimes used in addition to regular nailing schedules. This ladder-like framework can be seen in the linked site below. It is at the top of the roof framing drawing. The ladder-like boards are called "lookout rafters."
You should be able to find a drawing in most carpentry books at your local library or ask at your local lumber yard.
The raking (sloping) fascia board of the gable end is nailed to the lookout rafters. The horizontal fascia boards on the sloping side of the roof should extend far enough beyond the end of the garage to allow nailing the raking fascia boards of the gable end directly to the horizontal fascia boards that are nailed to the truss rafter tails.
Plywood or oriented strand boards (OSB) are usually used for the roof decking. These are nailed to the roof framing, covering the raking fascia board, the lookout rafters, and the roof trusses. This ties all of the framing members together giving the roof additional strength.
This method should be adequate to handle all snow loads. You MUST check your local building codes to see if there are any specific details that you must include.
Some builders use a cheaper method, but it often leads to sagging roof overhangs after twenty - forty years. It is often less expensive in the long run to use the method described above rather than having to rebuild the roof overhangs years later.
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