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Plywood for indoor use generally uses the less expensive urea-formaldehyde glue, which has limited water resistance, while outdoor and marine-grade plywood are designed to withstand moisture, and use a water-resistant resorcinol-formaldehyde or phenol-formaldehyde glue to prevent delamination and to retain strength in high humidity. [17]
In Australia and New Zealand a higher-grade marine ply than BS1088 is AS2272. It requires both faces to be "A" quality, with even-thickness plies. The most common plywood used for this grade is plantation-grown Hoop Pine which is fine grained, very smooth, moderately light (at 570 kg/m 3 or 36 lb/cu ft it is the same weight as Meranti ply and ...
Moisture Content-- BS 1088 plywood must have a moisture content between 6% and 14% when it leaves the factory. Finishing-- Boards will be sanded on both sides equally. Length & Width-- The length or width of a board produced as a standard size shall not be less than the specified size nor more than 6.3 mm (0.25") greater than the specified size.
Glulam brace with plates used for connections Glulam frame of a roof structure. Glued laminated timber, commonly referred to as glulam, is a type of structural engineered wood product constituted by layers of dimensional lumber bonded together with durable, moisture-resistant structural adhesives so that all of the grain runs parallel to the longitudinal axis.
However, welds result in a waterproof deck which is strong and easily repairable. The deck structure is welded to the hull, making it structurally a single unit. Because a metal deck, painted to reduce corrosion , can pick up heat from the sun , and be quite slippery and noisy to work on, a layer of wood decking or thick non-skid paint is often ...
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Today, they are specialty timbers as a result of their scarcity, although lower grade stocks are sold for landscaping use. Kauri is a superb timber for building the hulls and decks of boats. It too is now a specialty timber and ancient logs (in excess of 3 000 years) that have been mined from swamps are used by wood turners and furniture makers.
While plywood became widespread by the early 20th century, the invention of LVL was not until the 1980s after the invention of oriented strand board. [3] The American Wood Council's National Design Specification for Wood Construction is generally updated on a 3- to 5-year cycle. The 1991 release is the first release which mentions LVL.
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