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2. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   A study by Ducker International in 2005 identified the average cost per year of a metal roof to be US$3.2 per square metre ($0.30/sq ft) while single-ply roofs stood at $6.1/m 2 ($0.57/sq ft) and built-up roofing at $4.0/m 2 ($0.37/sq ft). [26] Metal roofs are also one of the most environmentally sound roofing options, with most metal roofing ...

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and 90% (± 2 pp) of major diameter for fine threads. [ 1 ] For metric V threads , the concept of major minus pitch (i.e., the major or widest diameter of the intended screw in millimeters minus the pitch of the threads of that screw in millimeters per thread) yields a good ...

4. Trump's tariffs will raise the roof on home prices - AOL

   www.aol.com/trumps-tariffs-raise-roof-home...

   The median price of a new home in December 2024 was $427,000, according to the Census Bureau. That’s up 30% in five years – and mortgage rates now are roughly double what they were just before ...

5. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...

6. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   The connection wires run under the ridge cap at the top of the roof. Efficiency ranges from 10–18% but costs only about $2.00–$3.00 per watt of installed capacity, compared to monocrystalline which is 17–22% efficient and costs $3.00–$3.50 per watt of installed capacity. Thin-film solar is light weight at 2.1–3.1 kg/m 2 (7

7. List of roof shapes - Wikipedia

   en.wikipedia.org/wiki/List_of_roof_shapes

   Monitor roof: A roof with a monitor; 'a raised structure running part or all of the way along the ridge of a double-pitched roof, with its own roof running parallel with the main roof.' Butterfly roof (V-roof, [ 8 ] London roof [ 9 ] ): A V-shaped roof resembling an open book.