1405.2 Weather protection.
BC § 1405.2
The exterior wall envelope shall provide weather protection for the building. The materials of the minimum nominal thickness specified in Table 1405.2 shall be acceptable as approved weather coverings. Exception: Weather coverings not meeting the minimum nominal thicknesses specified in Table 1405.2 shall be permitted provided such alternative has been approved. Table 1405.2Minimum Thickness of Weather Coverings Covering Type Minimum Thickness (inches)Covering Type Minimum Thickness (inches)Adhered masonry veneer*0.25 Aluminum siding0.019Anchored masonry veneer2.625Asbestos-cement boards0.125Asbestos shingles0.156Cold-rolled copper d0.0216 nominalCopper shingles d0.0162 nominalExterior plywood (with sheathing)0.313Exterior plywood (without sheathing)See Section 2304.6Fiber-cement lap siding0.25 cFiber-cement panel siding0.25 cFiberboard siding0.5Glass-fiber reinforced concrete panels0.375Hardboard siding c0.25High-yield copper d0.0162 nominalLead-coated copper d0.0216 nominalLead-coated high-yield copper0.0162 nominalMarble slabs1 Particleboard (with sheathing)See Section 2304.6Particleboard (without sheathing)See Section 2304.6Porcelain tile0.25Steel (approved corrosion resistant)0.0149Stone (cast artificial, anchored)1.5Stone (natural)2Structural glass0.344Stucco or exterior cement plaster Three-coat work over: Metal plaster base0.875 b Unit masonry0.625 b Cast-in-place or precast concrete0.625 b Two-coat work over: Unit masonry0.5 b Cast-in-place or precast concrete0.375 bTerra cotta (anchored)1Terra cotta (adhered)0.25Vinyl siding0.035Wood shingles0.375Wood siding (without sheathing) a0.5 For SI: 1 inch = 25.4 mm, 1 ounce = 28.35 g, 1 square foot = 0.093 m 2 . a. Wood siding of thicknesses less than 0.5 inch shall be placed over sheathing that conforms to Section 2304.6. b. Exclusive of texture. c. As measured at the bottom of decorative grooves. d. 16 ounces per square foot for cold-rolled copper and lead-coated copper, 12 ounces per square foot for copper shingles, high-yield copper and lead-coated high-yield copper. * Veneer units in this group shall be of an approved type and not be greater than 2 inches in thickness.
