Building Code of the Philippines(1)

Building Code of the Philippines(1)

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Unformatted text preview: type plywood that have been pressure impregnated by an approved preservative. Studs, joists, rafters, foundation plates or sills, planking 5 cm. (2 inches) or more than in depth, beams, stingers, posts, structural sheathing and similar load bearing members shall be of grades set forth in Table No. 3.04 (C) in the species sepcifically approved by the Building Official. 2. Stresses in poles or piles used as Structural Members. Induced stresses in pounds per square inch for normal loading of round poles or piles when used as structural members, except modulus of elasticity which shall be the same as for sawn lumber, shall not exceed 60 percent of the basic unit working stresses for the species as set forth in Table No. 3.04 (B) and the pieces shall meet the requirement of N.S.E.C. Standard No. 25-13-67 for poles or N.S.E.C. Standard No. 25-14-67 for piles. TABLE 3.04 (A) LIMIT OF DEFECTS BY GRADE INJOISTS AND PLANKS KIND OF DEFECTS Stress Grade 80% 67% Stress Grade 56% Stress Grade A. NATURAL DEFECTS 1. Worm holes, average diameter (maximum allowable size in inches) a. Individual b. Quantiry limitation 2. Slope of Grain (Maximum variation in inches from longitudinal axis per 12 inches within middle half of length) Not permitted Not permitted 3/4 1/15 1/4 Not clustered Not clustered 1 1-1/4 3. Checks and shakes a. Size of each check and shake, or if in combination, the sum of the sizes of all checks and shakes within middle half of depth of the 1/4 piece shall not exceed: of thickness b. End penetration: Checks splits at the middle half of the depth of the piece shall not extend 1/4 a distance grater than: of thickness Knots (Maximum allowable size of individual knot in inches)* Nominal width of face, in inches 1/4 3/8 of thickness of thickness 1/4 3/8 of thickness of thickness Narrow Along Narrow Along Narrow Along face on center face on center face on center edge of line of edge of line of edge of line of wide wide wide wide wide wide face face face face face face within within within the the the third of third of third of length length length of piece of piece of piece TABLE 3.04 (A) LIMIT OF DEFECTS BY GRADE IN JOISTS AND PLANKS Stress Grade KIND OF DEFECTS 2 3 4 5 6 8 10 12 14 16 18 and over Stress Grade 80% Stress Grade 67% 56% ¼ ¼ 1¼ ¾ ½¾ ¾ 1½ 1 ¾1 12 1½ 1½ 1 1¼ 1¼ 2½ 22 1¼ 1½ 1¾ 3¼ 2½ 2½ 1-3/8 2 2 3¾ 2¾ 3 1½ 2¼ 2¼ 4 3¼ 4 1¾ 2½ 2½ 4 3½ 4½ 1-7/8 2¾ 2¾ 4 3¾ 5 23 3 45 2 3 45 B. HANDLING, MANUFACTURE OR PROCESSING DEFECTS 1. Wane (maximum allowable size in inches) Nominal face dimension in inches 2 3 4 5 6 8 10 12 14 16 18 and over 1/8 1/8 ¼ ¼ 3/8 ½ 5/8 ¾ 7/8 1 2. Torn grain (allowable depth in inches) ½ ½ 5/8 5/8 ¾ 7/8 1 1-1/8 1½ 1¾ 1¼ 1-1/6 ½ ½ 5/8 5/8 ¾ 1 1¼ 1½ 1¾ 2 2 2¼ 2 2¼ 3. Skips, allowable size, in inches, not to exceed surface area (width x length) with x 4 width x 4 width x 4 Depth 1/32 1/16 1/8 Quantity 1 skip per 16 ft 1 skip per 16 ft 1 skip per 16 ft or shorter or shorter or shorter...
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This note was uploaded on 09/22/2013 for the course ARIDBE AR taught by Professor Any during the Fall '12 term at Mapúa Institute of Technology.

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