Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 14 - Exterior Walls
Section 1405 - INSTALLATION OF WALL COVERINGS
Subsection 1405.2 - Weather protection

Universal Citation: 780 CMR MA Code of Regs 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.

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