§ 27-621 General construction requirements.
AC § 27-621
The provisions of this section shall be considered as supplemental to the provisions of the applicable reference standards.
(a)Firecutting. The ends of wood beams, joists, and rafters resting on masonry or concrete walls shall be firecut to a bevel of three inches in their depth.
(b)Protection of members.
(1)Positive drainage shall be provided for all areas under the building not occupied by basements or cellars.
(2)All loose wood and debris and all wood forms shall be removed from spaces under the building. All stumps and roots shall be grubbed to a minimum depth of twelve inches.
(3)Wood members embedded in the ground and used for the support of buildings shall be treated.
(4)Wood joists or wood structural floors closer than eighteen inches, wood girders closer than twelve inches, or sills closer than eight inches to an exposed ground surface within or without the building shall be treated or shall be of an equivalent resistant species.
(5)Sleepers, sills, columns, and posts supported on concrete or masonry piers shall be treated or shall be of an equivalent resistant species unless isolated from the ground as specified in paragraph four of this subdivision or by a concrete slab. Where the isolation consists of a concrete slab-on-grade, the sleepers, sills, columns, or posts shall be raised at least three inches above the top of such slab.
(6)Ends of wood girders entering masonry or concrete walls shall be provided with a minimum one-half inch air space on top, sides, and at the end, unless the girder is treated or is of an equivalent resistant species.
(7)Wood or plywood used as siding or a combination of siding and sheathing shall be isolated from exposed ground by at least six inches.
(8)Crawl spaces shall be ventilated as required in subchapter twelve of this chapter.
(9)Where treated timber is required, the preservative treatment shall comply with reference standards RS 10-20 and RS 10-22. Treatment of wood poles shall comply with reference standard RS 10-28. All treated wood shall be handled in accordance with the provisions of reference standard RS 10-29.
