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An average weaver can tie almost 10,000 knots per day. More difficult patterns with an above-average knot density can only be woven by a skillful weaver, thus increasing the production costs even more. An average weaver may tie 360 knots per hour (one every 10 seconds), while 1200 knots approaches the maximum a skilful weaver can tie per hour. [2]
The weight designations originated with organic base felt weighing 15 or 30 pounds per 100 sq. ft. (6.8 kg or 14 kg per 9.3 m 2). However, modern base felts are made of lighter-weight fibre, so the weight designations, though common colloquially, are no longer literally accurate. [ 2 ]
Gypsum concrete is lightweight and fire-resistant. A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring ...
Underlayment may refer to: Underlay , a material placed underneath floor carpet, other flooring materials, or mattress bedding Underlayment, a water-resistant or waterproof layer used beneath many types of commercially available roofing material
Underlay is also the term for the material under roofing tiles; [1] this roofing membrane is often made of rubber and is used to seal the roof and prevent leakage. Underlayment used with roofing shingles provides a second layer of water proofing to prevent leaks and is called tar paper , roofing felt , or since the 1990s synthetic underlayment.
Single coverage thicknesses range from 55 to 90 pounds per square (100 sq. ft.) for single-coverage; Double coverage range from 110 to 140 pounds per square. [4] Fibre content: mixed rag fibre - lowest cost, shortest life; all plastic fibres; fibreglass - longest lived; Bitumen: bitumen - stiffens & hardens in winter, cracks in time
Vapor barrier location by geographical location. Moisture or water vapor moves into building cavities in three ways: 1) With air currents, 2) By diffusion through materials, 3) By heat transfer.
The Hereke carpet is woven in two ways: wool on cotton yarn and silk on silk. There are 3600 loops per dm² of wool carpets. Its quality is called 60x60. In silk carpets, there are 10.000 loops per dm². Its quality is called 100x100. This is the standard of real Hereke carpets, even though they are woven more often. [2]