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2. Square (unit) - Wikipedia

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

   square metre. 9.29030. The square is an Imperial unit of area that is used in the construction industry in the United States and Canada, [1] and was historically used in Australia. One square is equal to 100 square feet. Examples where the unit is used are roofing shingles, metal roofing, vinyl siding, and fibercement siding products.

3. Steel square - Wikipedia

   en.wikipedia.org/wiki/Steel_square

   Plumb bob. The steel square is a tool used in carpentry. Carpenters use various tools to lay out structures that are square (that is, built at accurately measured right angles), many of which are made of steel, but the name steel square refers to a specific long-armed square that has additional uses for measurement, especially of various angles.

4. Square (tool) - Wikipedia

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

   Framing square, or steel square, or carpenter's square, or roofing square Originally designed for timber framing, a framing square is made from a single flat piece of metal or polymer to a standardised design with a long, wide blade and at 90° to that a shorter, narrower tongue. It can also be used for measuring lengths and for calculating angles.

5. Asphalt roll roofing - Wikipedia

   en.wikipedia.org/wiki/Asphalt_roll_roofing

   The shingles produced in 1939 were sufficient to cover more than 1,000,000 dwellings, assuming an average size of 10 squares per roof. In two surveys of roofing materials in 20 Eastern States, - made during 1938, the kinds of roofing materials on 20,841 dwellings along 4,038 miles of highway were tabulated.

6. Floor and ceiling functions - Wikipedia

   en.wikipedia.org/wiki/Floor_and_ceiling_functions

   Ceiling function. In mathematics, the floor function is the function that takes as input a real number x, and gives as output the greatest integer less than or equal to x, denoted ⌊x⌋ or floor (x). Similarly, the ceiling function maps x to the least integer greater than or equal to x, denoted ⌈x⌉ or ceil (x). [1]

7. R-value (insulation) - Wikipedia

   en.wikipedia.org/wiki/R-value_(insulation)

   If the interior of a home is at 20 °C and the roof cavity is at 10 °C then the temperature difference is 10 °C (or 10 K). Assuming a ceiling insulated to RSI 2.0 (R = 2 m 2 ⋅K/W), energy will be lost at a rate of 10 K / (2 K⋅m 2 /W) = 5 watts for every square meter (W/m 2) of ceiling. The RSI-value used here is for the actual insulating ...