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  2. Sierpiński carpet - Wikipedia

    en.wikipedia.org/wiki/Sierpiński_carpet

    Then there is a square centered at P which is entirely contained in the carpet. This square contains a smaller square whose coordinates are multiples of ⁠ 1 / 3 k ⁠ for some k. But, if this square has not been previously removed, it must have been holed in iteration k + 1, so it cannot be contained in the carpet – a contradiction.

  3. Fitted carpet - Wikipedia

    en.wikipedia.org/wiki/Fitted_carpet

    Fitted carpet, also wall-to-wall carpet, is a carpet intended to cover a floor entirely. Carpet over 4 meters in length is usually installed with the use of a power-stretcher (tubed or tubeless). Carpet over 4 meters in length is usually installed with the use of a power-stretcher (tubed or tubeless).

  4. List of roof shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_roof_shapes

    Neo-Mansard, Faux Mansard, False Mansard, Fake Mansard: Common in the 1960s and 70s in the U.S., these roofs often lack the double slope of the Mansard roof and are often steeply sloped walls with a flat roof. Unlike the Second Empire, where upper story windows were contained within dormers, Neo-Mansard roofs have window openings cut through ...

  5. Speed square - Wikipedia

    en.wikipedia.org/wiki/Speed_square

    Among its basic uses are marking common, hip, valley and hip, or valley jack rafters, laying out stair stringers, determining and marking angles, and making square cuts on boards. Common lines made using a speed square include perpendicular cut marks and Angles definition of an angle for roofs, stairways, and decks. The tool uses a 0° reference.

  6. Timber roof truss - Wikipedia

    en.wikipedia.org/wiki/Timber_roof_truss

    Key:1: ridge beam, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.

  7. Carpet - Wikipedia

    en.wikipedia.org/wiki/Carpet

    Carpet tiles are also available, typically 50 centimetres (20 in) square. These are usually only used in commercial settings and are affixed using a special pressure-sensitive glue, which holds them into place while allowing easy removal (in an office environment, for example) or allowing rearrangement in order to spread wear.

  8. Knot density - Wikipedia

    en.wikipedia.org/wiki/Knot_density

    Knot density is a traditional measure for quality of handmade or knotted pile carpets.It refers to the number of knots, or knot count, per unit of surface area - typically either per square inch (kpsi) or per square centimeter (kpsc), but also per decimeter or meter (kpsd or kpsm).

  9. Portland International Airport carpet - Wikipedia

    en.wikipedia.org/wiki/Portland_International...

    The new carpet is made of materials from recycled carpet and plastic bottles and jars. [9] In February 2022, it was announced that the iconic carpet would be returning to the airport after the terminal was remodeled. On August 14, 2024, the remodeled terminal opened with the carpet featured in certain areas of the terminal. [13] [14]