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  2. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    4-inch (100 mm) hollow CMU (concrete masonry unit) [34] 45 Double layer of 1 ⁄ 2-inch (13 mm) drywall on each side, wood studs, batt insulation in wall 46 Single layer of 1 ⁄ 2-inch (13 mm) drywall, glued to 6-inch (150 mm) lightweight concrete block wall, painted both sides 46 6-inch (150 mm) hollow CMU (concrete masonry unit) [34] 48

  3. Hollow structural section - Wikipedia

    en.wikipedia.org/wiki/Hollow_structural_section

    A hollow structural section (HSS) is a type of metal profile with a hollow cross section. The term is used predominantly in the United States, or other countries which follow US construction or engineering terminology. HSS members can be circular, square, or rectangular sections, although other shapes such as elliptical are also available.

  4. Strength of materials - Wikipedia

    en.wikipedia.org/wiki/Strength_of_materials

    Margin of Safety is the common method for design criteria. It is defined MS = P u /P − 1. For example, to achieve a factor of safety of 4, the allowable stress in an AISI 1018 steel component can be calculated to be = / = 440/4 = 110 MPa, or = 110×10 6 N/m 2. Such allowable stresses are also known as "design stresses" or "working stresses".

  5. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    Steel doors mostly in default comes along with frame and lock system, which is a high cost efficiency factor compared to wooden doors. Most modern exterior walls provide thermal insulation and energy efficiency, which can be indicated by the Energy Star label or the passive house standards. Premium composite (including steel doors with a thick ...

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  7. List of ISO standards 3000–4999 - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_standards_3000...

    ISO 3576:1976 Hot-rolled carbon steel sheet coils for the production of cold-reduced products [Withdrawn without replacement] ISO 3577:1988 Animal fats — Determination of Bömer value [Withdrawn without replacement] ISO 3578:1980 Steel wire ropes — Standard designations [Withdrawn without replacement]

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  9. Window insulation - Wikipedia

    en.wikipedia.org/wiki/Window_insulation

    The U-value is used to refer to the amount of heat that can pass through a window, called thermal transmittance, with a lower score being better. [1] The U-factor of a window can often be found on the rating label of the window. Although the concept of U-value (or U-factor) is universal, U-values can be expressed in different units.