780 CMR, 1405.2
Current through Register 1531, September 27, 2024
Exterior walls 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.
TABLE 1405.2 MINIMUM THICKNESS OF WEATHER COVERINGS
| COVERING TYPE | MINIMUM THICKNESS (inches) | ||
| Adhered masonry veneer | 0.25 | ||
| Aluminum siding | 0.019 | ||
| Anchored masonry veneer | 2.625 | ||
| Asbestos-cement boards | 0.125 | ||
| Asbestos shingles | 0.156 | ||
| Cold-rolled copperd | 0.0216 nominal | ||
| Copper shinglesd | 0.0162 nominal | ||
| Exterior plywood (with sheathing) | 0.313 | ||
| Exterior plywood (without sheathing) | See Section 2304.6 | ||
| Fiber-cement lap siding | 0.25c | ||
| Fiber-cement panel siding | 0.25c | ||
| Fiberboard siding | 0.5 | ||
| Glass-fiber reinforced concrete panels | 0.375 | ||
| Hardboard sidingc | 0.25 | ||
| High-yield copperd | 0.0162 nominal | ||
| Lead-coated copperd | 0.0216 nominal | ||
| Lead-coated high-yield copper | 0.0162 nominal | ||
| Marble slabs | 1 | ||
| Particleboard (with sheathing) | See Section 2304.6 | ||
| Particleboard (without sheathing) | See Section 2304.6 | ||
| Precast stone facing | 0.625 | ||
| Steel (approved corrosion resistant) | 0.0149 | ||
| Stone (cast artificial) | 1.5 | ||
| Stone (natural) | 2 | ||
| Structural glass | 0.344 | ||
| Stucco or exterior cement plaster | |||
| Three-coat work over: | |||
| Metal plaster base | 0.875b | ||
| Unit masonry | 0.625b | ||
| Cast-in-place or precast concrete | 0.625b | ||
| Two-coat work over: | |||
| Unit masonry | 0.5b | ||
| Cast-in-place or precast concrete | 0.375b | ||
| Terra cotta (anchored) | 1 | ||
| Terra cotta (adhered) | 0.25 | ||
| Vinyl siding | 0.035 | ||
| Wood shingles | 0.375 | ||
| Wood siding (without sheathing)a | 0.5 | ||
| For SI: 1 inch = 25.4 mm, 1 ounce per square foot = 0.305 kg/m2. 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. |
780 CMR, 1405.2