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(a) Decay. All wood used in conditions conducive to decay shall be either a naturally durable species or pressure-preservative treated wood and where permitted for use as a structural element, design values for untreated lumber shall apply. Pressure-preservative treated wood including plywood shall meet the retention, penetration and other requirements applicable to the species, product, treatment and conditions of use detailed in AWPA P1-91, C2-91, C3-92, C4-92, C9-90, C22-91 and C24-86. Preservatives shall conform to AWPA P1-91, P2-90, P5-91, P8-91 and P9-91. All piles, poles, lumber and plywood which are required to be pressure-preservative treated shall bear the quality mark of an approved inspection agency which maintains continuing supervision, testing and inspection over the quality of the product. Quality control inspection agencies for pressure-preservative treated wood shall be accredited as to competency and performance by the American Lumber Standards Committee or its equivalent and shall be acceptable to the building commissioner. Said mark shall include the following information in legible format: identification of the inspection agency; identification of the treating plant; and the purposes for which the product was treated.
(b) Fire-Retardant Wood. This is lumber and plywood as defined in Subsection 15-12-040(f) and shall comply with the requirements of that subsection. When permitted for use as a structural element, design values for untreated lumber shall be adjusted for lumber that is pressure impregnated with fire-retardant chemicals. Adjustments to the design values shall be based upon an approved method of investigation which takes into consideration the effects of the anticipated temperature and humidity to which the fire-retardant treated wood will be subjected, the type of treatment and redrying procedure. The material shall bear the quality mark of an approved agency having a re- examination service, and such quality mark shall show the performance rating of the material. Fire-retardant treated wood shall be dried before use to a moisture content of 19 percent or less for lumber and 15 percent or less for plywood.
(Added Coun. J. 6-14-95, p. 2832; Amend Coun. J. 3-5-03, p. 104990, § 31; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)