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  2. Waffle slab - Wikipedia

    en.wikipedia.org/wiki/Waffle_slab

    Diagram shows slab and rib width with rules of thumb formula. Slab depth is typically 75 mm (3 in) to 130 mm (5 in) thick. [5] [3] As a rule of thumb, the depth should be 1 ⁄ 24 of the span. [5] The width of the ribs is typically 130 mm (5 in) to 150 mm (6 in), and ribs usually have steel rod reinforcements. [5]

  3. Concrete slab - Wikipedia

    en.wikipedia.org/wiki/Concrete_slab

    For a suspended slab, there are a number of designs to improve the strength-to-weight ratio. In all cases the top surface remains flat, and the underside is modulated: A corrugated slab is designed when the concrete is poured into a corrugated steel tray, more commonly called decking. This steel tray improves strength of the slab, and prevents ...

  4. Hollow-core slab - Wikipedia

    en.wikipedia.org/wiki/Hollow-core_slab

    The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.

  5. Floor area ratio - Wikipedia

    en.wikipedia.org/wiki/Floor_area_ratio

    Comparison of floor area ratio (FAR) or floor space index (FSI) and building coverage ratio (BCR) Floor area ratio (FAR) is the ratio of a building's total floor area (gross floor area) to the size of the piece of land upon which it is built.

  6. Board foot - Wikipedia

    en.wikipedia.org/wiki/Board_foot

    The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada. [1] It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters .

  7. Double tee - Wikipedia

    en.wikipedia.org/wiki/Double_tee

    They designed the wings to expand the structural channel in order to cover more area at a lower cost. [2] In 1951, Harry Edwards and Paul Zia designed a 4-foot (1.2 m) wide prestressed double tee section. Non-prestressed double tees were constructed in Miami in 1952 followed by prestressed double tees in 1953. Separately, engineers of ...

  8. Wood - Wikipedia

    en.wikipedia.org/wiki/Wood

    "The work or shock-resisting ability is greatest in wide-ringed wood that has from 5 to 14 rings per inch (rings 1.8-5 mm thick), is fairly constant from 14 to 38 rings per inch (rings 0.7–1.8 mm thick), and decreases rapidly from 38 to 47 rings per inch (rings 0.5–0.7 mm thick).

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