Chapter 3 Review

Chapter 3 Review - 4 Span rating is determined in lab tests...

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1. When the tree is first cut there is a large amount of moisture present. After the tree is cut the moisture slowly begins to evaporate out. After the sawing process more moisture continues to evaporate and as it does the board begins to warp. In order to try and combat the warping of the boards lumber manufactures will dry the wood under close supervision. After the board is installed in a house there is still moisture present: but, the board is in place and the warping will be less noticeable since it is in a rigid position. 2. 1x4 = ¾ x3 ½ 2x4 = 1 ½ x 3 ½ 2x6 = 1 ½ x 5 ½ 2x8 = 1 ½ x 7 ¼ 4x4 = 3 ½ x 3 ½ 4x12 = 3 ½ x 11 ¼ 3. Wood is laminated because it can create new and different shapes that do not occur in nature. It also provides added strength and quality.
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Unformatted text preview: 4. Span rating is determined in lab tests. A board with a span rating of 32/16 may be used as roof sheeting over rafters spaced 32 inches apart or as sub flooring over joists 16 inches apart. Plywood, composite, and OSB are rated this way. 5. Preservative woods are specified so that the purchaser will know that is in the wood. It might mean that the wood has additives to help decrease its susceptibility to fire and attach by insects. 6. The most widely used types of insect resistant woods are redwood, bald cypress, red cedars, and white cedars. 7. Nails are the main choice for installing wood because they are fast, cheap, and inexpensive. Nails also require no pre drilling....
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