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Timber can be dried to any desired low moisture content by conventional or solar kiln drying, but in air drying, moisture contents of less than 18% are difficult to attain for most locations. The drying times are considerably less in conventional kiln drying than in solar kiln drying, followed by air drying.
The ratio of resin to aggregate should be at the optimal amount (7% resin to aggregate) depending on the application and environment type, and stone type which should be kiln dried mixed aggregate incorporating 2-5 mm sizes to ensure that the aggregate gets sufficiently coated and also to meet the standard requirements when tested to BS 8204-6: ...
CLS timber is kiln-dried and is white wood. [9] Tree sources include Fir, Pine and Spruce. [10] [6] CLS is planed and fished with eased or rounded edges. [9] [11] CLS timber is commonly graded at two strengths, C16 or C24. [9] C24 is the stronger and is typically more expensive. [10]
The low cost and widespread availability of the limestone, shales, and other naturally occurring materials used in portland cement make it a relatively cheap building material. Its most common use is in the production of concrete, a composite material consisting of aggregate (gravel and sand), cement, and water.
The clay percentage may be reduced by adding sand, if available. [21] If there is more than 15% clay it may take more than 10% cement to stabilize the soil, which adds to the cost. [20] If earth contains little clay and holds 10% or more cement, it is in effect concrete.
Douglas-fir sees wide use in heavy timber structures, as its wood is strong, available in a number of specifications including kiln dried and grade stamped, and can be supplied in very long lengths to 60 feet. West coast mills are sophisticated in their processing of timbers, making lead times predictable and availability reliable.