| http://www.w3.org/ns/prov#value | - However, overlays for leveling or finishing purposes which do not meet the requirements for an approved deck covering may be used in thicknesses not exceeding 3???8 of an inch. (7) Ceilings, linings, and insulation, including pipe and duct laggings, shall be of approved incombustible materials. (8) Any sheathing, furring or holding pieces incidental to the securing of any bulkhead, ceiling, lining
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