The exterior wall envelope design shall be considered to resist wind-driven rain where the results of testing indicate that water did not penetrate control joints in the exterior wall envelope, joints at the perimeter of openings or intersections of terminations with dissimilar materials.
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 |
Porcelain tile | .025 |
Precast stone facinge | 0.625 |
Steel (approved corrosion resistant) | 0.0149 |
Stone (cast artificial, anchored) | 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 |
TABLE 1405.3.1
CLASS III VAPOR RETARDERS
ZONE | CLASS III VAPOR RETARDERS PERMITTED FOR:a |
Marine 4 | Vented cladding over wood structural panels Vented cladding over fiberboard Vented cladding over gypsum Insulated sheathing with R-value ≥ R2.5 over 2 × 4 wall Insulated sheathing with R-value ≥ R3.75 over 2 × 6 wall |
5 | Vented cladding over wood structural panels Vented cladding over fiberboard Vented cladding over gypsum Insulated sheathing with R-value ≥ R5 over 2 × 4 wall Insulated sheathing with R-value ≥ R7.5 over 2 × 6 wall |
6 | Vented cladding over fiberboard Vented cladding over gypsum Insulated sheathing with R-value ≥ R7.5 over 2 × 4 wall Insulated sheathing with R-value ≥ R11.25 over 2 × 6 wall |
7 and 8 | Insulated sheathing with R-value ≥ R10 over 2 × 4 wall Insulated sheathing with R-value ≥ R15 over 2 × 6 wall |
Class I: | Sheet polyethylene, nonperforated aluminum foil. |
Class II: | Kraft-faced fiberglass batts or paint with a perm rating greater than 0.1 and less than or equal to 1.0. |
Class III: | Latex or enamel paint. |
Exceptions:
TABLE 1406.2.1.1.2
MINIMUM FIRE SEPARATION FOR COMBUSTIBLE
EXTERIOR WALL COVERINGS
FIRE SEPARATION DISTANCE (feet) | TOLERABLE LEVEL INCIDENT RADIANT HEAT ENERGY(kW/m2) | FIRE SEPARATION DISTANCE (feet) | TOLERABLE LEVEL INCIDENT RADIANT HEAT ENERGY(kW/m2) | |
5 | 12.5 | 16 | 5.9 | |
6 | 11.8 | 17 | 5.5 | |
7 | 11.0 | 18 | 5.2 | |
8 | 10.3 | 19 | 4.9 | |
9 | 9.6 | 20 | 4.6 | |
10 | 8.9 | 21 | 4.4 | |
11 | 8.3 | 22 | 4.1 | |
12 | 7.7 | 23 | 3.9 | |
13 | 7.2 | 24 | 3.7 | |
14 | 6.7 | 25 | 3.5 | |
15 | 6.3 |
Exception: The distance between the back of the exterior wall covering and the exterior wall shall be permitted to exceed 15/8 inches (41 mm) where the concealed space is not required to be fireblocked by Section 718.
Exception: Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 shall be exempt from the height limitation.
Class CC1: Materials that have a burning extent of 1 inch (25 mm) or less when tested at a nominal thickness of 0.060 inch (1.5 mm) or in the thickness intended for use.
Class CC2: Materials that have a burning rate of 21/2 inches per minute (1.06 mm/s) or less when tested at a nominal thickness of 0.060 inch (1.5 mm) or in the thickness intended for use.
Exception: In buildings provided with flame barriers complying with Section 705.8.5 and extending 30 inches (760 mm) beyond the exterior wall in the plane of the floor, a vertical separation shall not be required at the floor other than that provided by the vertical thickness of the flame barrier.
TABLE 1407.11.3.4
AREA LIMITATION AND SEPARATION REQUIREMENTS FOR MCM PANELS
FIRE SEPARATION DISTANCE (feet) | COMBUSTIBILITY CLASS OF MCM | MAXIMUM PERCENTAGE AREA OF EXTERIOR WALL COVERED WITH MCM PANELS | MAXIMUM SINGLE AREA OF MCM PANELS (square feet) | MINIMUM SEPARATION OF MCM PANELS (feet) | |
Vertical | Horizontal | ||||
Less than 6 | — | Not Permitted | Not Permitted | — | — |
6 or more but less than 11 | CC1 | 10 | 50 | 8 | 4 |
CC2 | Not Permitted | Not Permitted | — | — | |
11 or more but less than or equal to 30 | CC1 | 25 | 90 | 6 | 4 |
CC2 | 15 | 70 | 8 | 4 | |
More than 30 | CC1 | 50 | Not Permitted | 3a | 0 |
CC2 | 50 | 100 | 6a | 3 |
Exception: Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 shall be exempt from the height limitation.
Exception: Where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, the fire separation distance shall be permitted to be reduced to not less than 20 feet (6096 mm).
Class CC1: Materials that have a burning extent of 1 inch (25 mm) or less when tested at a nominal thickness of 0.060 inch (1.5 mm), or in the thickness intended for use.
Class CC2: Materials that have a burning rate of 21/2 inches per minute (1.06 mm/s) or less when tested at a nominal thickness of 0.060 inch (1.5 mm), or in the thickness intended for use.
Exception: Where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, the maximum aggregate area of MCM panels shall be increased to 50 percent of the exterior wall face of the story on which it is installed and there shall not be a limit on the maximum dimension or area of a single MCM panel.
Exception: Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.