When you are looking to extend the eaves on your garage, it is important to keep the same structural properties as if it was a continuation of the previously existing structure. You will want to take into consideration what type of load the extension will carry, how long the extension will be and what type of lateral support exists. There are a couple of different ways to extend eaves on a garage, both of which involve the extension of rafters through a splicing process. The steps below are given in two sections to clarify the two different techniques.
- Skill level:
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Things you need
- Galvanised nails
- Manufactured metal splice plates (optional)
- Tape measure
Consider the function you are trying to accomplish by extending the eaves. This will determine whether the overhang you are adding will be a few inches or a couple of feet. Protection from rain, ice and snow for exterior walls or additional shading from the sun are motives for extending your roof overhang. Keep in mind the effect the extension will have on any window exposure. Consider the pitch of the roof in relation to the extension of the eaves, making sure that the extension will be complementary to the existing roof line.
Butt the ends of the rafters together over a supporting beam. Supporting beams are horizontal members that are installed to support and strengthen the load of a structure. Check with a construction glossary for an explanation of any term that needs clarification. There are several excellent construction glossaries online.
Nail two pieces of 2-inch wood of the same width as the rafters to the existing rafter. These wood pieces should be about 18 inches long and centred over both sides. You can also join the sections using manufactured metal splice plates. Manufactured splice plates can be purchased at your local home improvement centre or building supply store.
Check to make sure each rafter end site lies a full inch on the supporting beam. You many need to splice several rafters. If so, stagger the splices over different beams to avoid weak construction.
Butt Rafter Ends Together
Overlapped rafter ends are supported by beams. In this second method you will also be using 2-inch pieces of wood the same width as the rafters and about 18 inches in length for your splice pieces.
Alternate rafter sides if more than one splice is needed on a full rafter length. For example, if the first extension splice is added to the left side of the rafter, splice the next section on the right side of the previous extension splice piece.
Nail both faces of each 2-inch lumber splice, using 8-d galvanised nails. This method of splicing adds stability to the rafters and typically eliminates the need for bracing.
Overlap Rafter Ends
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