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2. Joist - Wikipedia

   en.wikipedia.org/wiki/Joist

   A double floor is a floor framed with joists supported by larger timbers.. In traditional timber framing there may be a single set of joists which carry both a floor and ceiling called a single floor (single joist floor, single framed floor) or two sets of joists, one carrying the floor and another carrying the ceiling called a double floor (double framed floor).

3. Framing (construction) - Wikipedia

   en.wikipedia.org/wiki/Framing_(construction)

   Open web trussed joists and rafters are often formed of 4 cm by 9 cm (two-by-four) wood members to provide support for floors, roofing systems and ceiling finishes. Platform framing was traditionally limited to four floors but some jurisdictions have modified their building codes to allow up to six floors with added fire protection. [32]

4. Laminated veneer lumber - Wikipedia

   en.wikipedia.org/wiki/Laminated_veneer_lumber

   Rotten LVL joists from the Berkeley balcony collapse. Because it is specifically sized to be compatible with I-joist floor framing, residential builders and building designers like the combination of I-joist and LVL floor and roof assemblies. LVL is considered to be a highly reliable building material that provides many of the same attributes ...

5. I-joist - Wikipedia

   en.wikipedia.org/wiki/I-joist

   A similar situation occurs where the I-joist crosses a main beam. Installing squash blocks (2×4 materials 1 ⁄ 16 in or 1.6 mm higher than the I-joist) alongside the I-joists transfers the load from the I-joist onto the beam. Missed nails and glue setting too fast can lead to an uneven or squeaky floor. [3]

6. Wood flooring - Wikipedia

   en.wikipedia.org/wiki/Wood_flooring

   Additionally, engineered wood flooring may use the glue-down method as well. A layer of mastic is placed onto the sub-floor using a trowel similar to those used in laying ceramic tile. The wood pieces are then laid on top of the glue and hammered into place using a rubber mallet and a protected 2x4 to create a level floor.

7. Crawl space - Wikipedia

   en.wikipedia.org/wiki/Crawl_space

   A crawl space foundation can be used to elevate the lowest floors of residential buildings located in Special Flood Hazard Areas above the Base Flood Elevation. The Federal Emergency Management Agency recommends that the floor of the crawlspace be at or above the lowest grade adjacent to the building. [3]