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  2. 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.

  3. Sierpiński carpet - Wikipedia

    en.wikipedia.org/wiki/Sierpiński_carpet

    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. The Hausdorff dimension of the carpet is log ⁡ 8 log ⁡ 3 ≈ 1.8928 {\displaystyle {\frac {\log 8}{\log 3}}\approx 1.8928} .

  4. Rafter - Wikipedia

    en.wikipedia.org/wiki/Rafter

    Hip rafter (angle rafter): The rafter in the corners of a hip roof. The foot of a hip rafter lands on a dragon beam. King rafter: the longest rafter on the side of a hip roof in line with the ridge. Valley rafter (historically also called a sleeper): A rafter forming a valley (look for illustration showing a valley). Intermediate rafter: "one ...

  5. Penrose tiling - Wikipedia

    en.wikipedia.org/wiki/Penrose_tiling

    B-tiles can be related to such A-tiles in two ways: If B S has the same size as A L then B L is an enlarged version φ A S of A S, with side lengths (φ, φ, φ 2 = 1 + φ) – this decomposes into an A L tile and A S tile joined along a common side of length 1.

  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. Domestic roof construction - Wikipedia

    en.wikipedia.org/wiki/Domestic_roof_construction

    The top ends of the rafters often meet at a ridge beam, but may butt directly to another rafter to form a pair of rafters called a couple. Depending on the roof covering material, either horizontal laths , battens , or purlins are fixed to the rafters; or boards, plywood , or oriented strand board form the roof deck (also called the sheeting or ...

  8. Square (tool) - Wikipedia

    en.wikipedia.org/wiki/Square_(tool)

    Speed square, or rafter square, or rafter angle square, or triangle square, or layout square A speed square is a triangular carpenters square combining functions of the combination square, try square, and framing square into one. It can be used to calculate and mark angles, to suspend a plumb bob, and as a fence for a circular saw.

  9. 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).