Lumber

Construction Technology

 * CABINET UNIT -** **(TCJ2O)**

include component="page" page="toolbar_cabinet_units" editable="1" P 3-6 1. Why has wood always been one of the most popular construction materials? 2. What are three uses of wood other than for furniture and building construction? 3. What significant advantage does wood have over many other natural resources? 4. What can we do as individuals to help maintain the supply of lumber? 5. (a) How can a softwood tree be distinguished from a hardwood tree? (b) Name three trees in each group. (c) List three uses of softwood and three of hardwood. 6. Draw a cross section of a tree trunk and label the growth formation. Ans- 7. Write a paragraph describing one method of sawing lumber. Ans- 8. (a) why do flat-grain boards warp more easily than edge-grain boards? Ans- (b) What are three uses of quarter-sawed boards? Ans- 9. (a) What is meant by the term “seasoning lumber”? Ans- (b) What is the desired moisture content of: i) air-seasoned lumber. Ans- ii) kiln-seasoned lumber. Ans- 10. Why should spaces, used for piling lumber, be of uniform thickness? Ans- 11. (a) What is an advantage of kiln seasoning lumber? Ans- (b) Why must humidity be controlled? Ans- (c) What three factors govern the kiln-seasoning process? Ans-
 * Unit** **1: Classification of Lumber**

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