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  2. Knob-and-tube wiring - Wikipedia

    en.wikipedia.org/wiki/Knob-and-tube_wiring

    Ceramic bushings protected each wire entering a metal device box, when such an enclosure was used. Loom, a woven flexible insulating sleeve, was slipped over insulated wire to provide additional protection whenever a wire passed over or under another wire, when a wire entered a metal device enclosure, and in other situations prescribed by code.

  3. 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).

  4. Blocking (construction) - Wikipedia

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

    The intervals for the blocks are specified in the building code or as calculated by a structural engineer. Blocking also resists the rotational movement, or twisting, of floor joists as they deflect under load. This may take the form of diagonal cross bracing, or herringbone, bracing between floor joists.

  5. Floor - Wikipedia

    en.wikipedia.org/wiki/Floor

    [citation needed] Heavy floors, such as those made of stone, require more closely spaced joists. If the span between load-bearing walls is too long for joists to safely support, then a heavy crossbeam (thick or laminated wood, or a metal I-beam or H-beam) may be used. A "subfloor" of plywood or waferboard is then laid over the joists.

  6. Open web steel joist - Wikipedia

    en.wikipedia.org/wiki/Open_web_steel_joist

    The LH- and DLH-Series have been designed for the purpose of extending the use of joists to spans and loads in excess of those covered by Open Web Steel Joists, K-Series. LH-Series Joists have been standardized in depths from 18 inches (460 mm) through 48 inches (1,200 mm), for spans through 96 feet (29,000 mm).

  7. I-joist - Wikipedia

    en.wikipedia.org/wiki/I-joist

    As of 2005, approximately 50% of all wood light framed floors used I-joists. [2] [clarification needed] I-joists were designed to help eliminate typical problems that come with using solid lumber as joists. The advantage of I-joists is they are less likely to bow, crown, twist, cup, check, or split as would a piece of dimensional lumber. I ...