915 WALL ST 2019-09-24 - Laserfiche WebLink

PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE 3 11. Flashing shall be corrosion-resistant metal [R703.8] 12. Decks shall not be used or occupied until final - of minimum nominal 0.019-inch thickness or inspection and approval is obtained. approved non-metallic material.Aluminum should 13. This document is not intended to preclude the use of not be used in direct contact with lumber treated other construction methods or materials not described with preservatives that contain copper such as ACQ, herein. Copper Azole,or ACZA. Table 1. Common Species and Use Categories for Decay Resistance.1 Above Ground Species Ground Contact Southern Pine X X (=I0 Douglas Fir-Larch X X *al • Hem-Fir X X (i) SPF X > Ponderosa Pine X X a) Red Pine X X cn a_ Redwood X X Western Cedars X >'c Redwood X z O Western Cedars X 1.Use categories listed in Table 1 are based on the American Wood Protection Association (AWPA) Book of Standards. 2.Above Ground—UC3B; Ground Contact—UC4A. 3.Naturally durable species with 90% heartwood in width on each side need not be treated per minimum requirements. DECKING' REQUIREMENTS authority having jurisdiction; however,connections equivalent to those shown for lumber or span rated All decking material shall be composed of dimension decking are assumed. lumber(2" nominal thickness)or span rated decking in accordance with the American Lumber Standard JOIST SIZE Committee Policy for Evaluation of Recommended Spans for Span Rated Decking Products(November 5, The span of a joist, L,is measured from the face of 2004). Attach decking to each joist with 2-8d threaded support at one end of the joist to the face of support at nails or 2-#8 screws. Space decking boards the other end of the joist and does not include the length approximately 1/8" apart. See Figure 11 for decking of the overhangs,Lo. Use Table 2 to determine connection requirements at the rim joist. Decking allowable joist span, Li,based on lumber size and joist placement may range from an angle perpendicular to the spacing. Joist span, L, must be less than or equal to joists to an angle of 45 degrees to the joists. Each allowable joist span, L . Overhang length is the lesser of segment of decking must bear on a minimum of 3 joists allowable overhang,Lo,or one fourth the joist span,1./4. (or 3 supports). See Figure 1 and Figure 2 for joist span types. Decking not meeting these requirements may be substituted when the product has been approved by the 1- 6 American Wood Council