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8 mats = 12 shaku × 12 shaku ≈ 3.64 m × 3.64 m (11.9 ft × 11.9 ft) Shops were traditionally designed to be 5 + 1 ⁄ 2 mats, and Japanese tea rooms are frequently 4 + 1 ⁄ 2 mats. [citation needed] Another format is the Ryūkyū (琉球) tatami, originating from the Ryūkyū Islands, which are square and can have various measurements. [9]
The first expanded polystyrene ICF Wall forms were developed in the late 1960s with the expiration of the original patent and the advent of modern foam plastics by BASF. [citation needed] Canadian contractor Werner Gregori filed the first patent for a foam concrete form in 1966 with a block "measuring 16 inches high by 48 inches long with a tongue-and-groove interlock, metal ties, and a waffle ...
Although foam-core panels gained attention in the 1970s, the idea of using stress-skinned panels for construction began in the 1930s. Research and testing of the technology was done primarily by Forest Products Laboratory (FPL) in Madison, Wisconsin , as part of a U.S. Forest Service attempt to conserve forest resources.
A burr puzzle is an interlocking puzzle consisting of notched sticks, combined to make one three-dimensional, usually symmetrical unit. These puzzles are traditionally made of wood, but versions made of plastic or metal can also be found. Quality burr puzzles are usually precision-made for easy sliding and accurate fitting of the pieces.
Recently, synthetic polystyrene or polyurethane foam has been used in combination with structural materials, such as concrete. It is lightweight, easily shaped, and an excellent insulator. Foam is usually used as part of a structural insulated panel, wherein the foam is sandwiched between wood or cement or insulating concrete forms.
Floating tile flooring, also called modular tile flooring, includes a range of porcelain and ceramic tile products that can be installed without adhesive or mortar. Generally, the tile is rectified to precise dimensions, and fused to an interlocking base. Some products require use of a flexible grout and others have an integrated grout strip.