In ordinary wood‑frame construction the wood floors are less substantial than Type IV construction and are typically supported by:

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Multiple Choice

In ordinary wood‑frame construction the wood floors are less substantial than Type IV construction and are typically supported by:

Explanation:
In ordinary wood-frame construction the floor system relies on floor joists. These horizontal wooden members span between bearing walls or between a wall and a beam, carrying the floor sheathing and transferring loads down to the supports. This setup is lighter and less substantial than Type IV construction, which uses large timber beams and columns. Concrete slabs aren’t typical in standard wood-frame buildings, and while steel girders can be used in some designs, they aren’t the usual primary support for the floor—the joists are.

In ordinary wood-frame construction the floor system relies on floor joists. These horizontal wooden members span between bearing walls or between a wall and a beam, carrying the floor sheathing and transferring loads down to the supports. This setup is lighter and less substantial than Type IV construction, which uses large timber beams and columns. Concrete slabs aren’t typical in standard wood-frame buildings, and while steel girders can be used in some designs, they aren’t the usual primary support for the floor—the joists are.

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