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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. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   ISO 18265: "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019)

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...

5. Bracket (architecture) - Wikipedia

   en.wikipedia.org/wiki/Bracket_(architecture)

   [1] [2] It can be made of wood, stone, plaster, metal, or other media. A corbel or console are types of brackets. [3] In mechanical engineering a bracket is any intermediate component for fixing one part to another, usually larger, part. What makes a bracket a bracket is that it is intermediate between the two and fixes the one to the other.

6. Framing (construction) - Wikipedia

   en.wikipedia.org/wiki/Framing_(construction)

   Wall framing in house construction includes the vertical and horizontal members of exterior walls and interior partitions, both of bearing walls and non-bearing walls. . These stick members, referred to as studs, wall plates and lintels (sometimes called headers), serve as a nailing base for all covering material and support the upper floor platforms, which provide the lateral strength along a

7. Double tee - Wikipedia

   en.wikipedia.org/wiki/Double_tee

   Double tees are connected during the construction without topping with concrete to create the parking structure floor surface. [6] A benefit of pre-topped double tees is a higher quality concrete for more durable surface to reduce traffic wears. Factories can produce the topping with minimum concrete strength of 5,000 psi. In some areas, the ...

8. Corbel - Wikipedia

   en.wikipedia.org/wiki/Corbel

   In architecture, a corbel is a structural piece of stone, wood or metal jutting from a wall to carry a superincumbent weight, [1] a type of bracket. [2] A corbel is a solid piece of material in the wall, whereas a console is a piece applied to the structure. A piece of timber projecting in the same way was called a "tassel" or a "bragger" in ...

9. Birdsmouth joint - Wikipedia

   en.wikipedia.org/wiki/Birdsmouth_joint

   A birds-mouth joint in a rafter, set upon a double top plate. Shown are the two cuts of the joint: the seat cut and the heel cut. In light frame construction, a birdsmouth joint or bird's beak cut is a woodworking joint that is generally used to connect a roof rafter to the top plate of a supporting wall. [1]