24Properties of WoodGood understanding of wood properties is essential for intelligent lumber selection.Properties Include:HardnessBending strengthStiffnessCompression strengthToughness
25How is lumber sized, purchased, and stored? Problem:How is lumber sized, purchased, and stored?
26Worked lumber Wood that has been Shaped (trim) Matched (tongue-and-groove)Patterned (molding)
27Actual vs. Nominal Dimensions The difference between nominal and actual (dressed) dimensions of lumber is the result of:Planing,Shrinkage that occurs during drying.
28Actual vs. Nominal Dimensions Nominal dimensions (2×4, 1×6, etc.) are used when ordering lumberProject planner uses the actual planed dimensions (¾×3½ , 1½×7¼, etc.) to determine the number and length of boards needed
29Actual vs. Nominal Dimensions Softwood nominal widths are 2, 3, 4, 6, 8, 10, and 12 inch.Standard available lengths are even feet from 6 to 20.
30Actual vs. Nominal Dimensions To find the actual width for nominal widths of 6 inches or less drop ½ inch.For nominal widths of over 6 inches drop ¾ inch to find the actual width.
33Linear feet length in feet without regard to thickness or width Thickness of these sheets vary through a range of ¼, 3/8, ½, 5/8, to ¾ inchGenerally sold by the 4×8 sheetPlywood,Particle board,Paneling are generally sold by the 4×8 sheet.
34Actual vs. Nominal Dimensions All of these materials are priced either by the square foot or by the sheet.Other building materials, such as roofing and siding, are sold by “the square”.“The square” actually means 100 square feet of surface coverage.
35Ordering LumberDo not order large quantities of lumber long in advanceWhen storing lumber, care should be taken to avoid:Warping,Staining, andMoisture absorption problems.