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What size rafters and ceiling joists and what spacing does the roof extension over the garage use?

A. 2x4
B. 2x6
C. 2x8
D. 2x10

Answer :

Final answer:

The size of rafters and ceiling joists for a roof extension over a garage depends on factors such as the span and load. Larger dimensions are used for longer spans and heavier loads, while smaller dimensions can be suitable for smaller spans and lighter loads. Spacing will be determined by design requirements and local codes.

Explanation:

The size of rafters and ceiling joists, as well as their spacing, for a roof extension over a garage will depend on various factors such as the span of the roof, the load it needs to support, and local building codes. Generally, larger and stronger rafters and joists are used for longer spans and heavier loads. In the given options of 2x4, 2x6, 2x8, and 2x10, the sizes represent the dimensions in inches of the lumber used.

For smaller spans and lighter loads, 2x4 or 2x6 rafters and ceiling joists may be suitable. However, for longer spans or heavier loads, 2x8 or 2x10 rafters and ceiling joists would be more appropriate. The spacing of the rafters and ceiling joists will be determined by the design requirements and local building codes.

It is important to consult with a structural engineer or a qualified professional to determine the appropriate size and spacing for rafters and ceiling joists for a specific roof extension project.

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