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Water-Resitive Barriers/Housewraps
Common Industry Test Standards
- ASTM E 2178 – Air Permeance of Materials
- ASTM E 1677 – Specification For Air Retarder Materials/Systems
- ASTM E 283 – Rate of Air Leakage Through Exterior Windows, Curtain Walls and Doors
- ASTM E 330 - Structural Performance by Uniform Static Air Pressure Difference
- ASTM E 331 - Water Penetration of Exterior Windows, Skylights Doors and Curtain Walls by Uniform Static Air Pressure Difference
- ASTM E 96 - Water Vapor Transmission of Material
Housewrap Standards
| Performance Property |
Test Standard |
Specimen Size |
Test Procedure |
Test Results |
Performance Requirements |
ASTM
E 2178
|
Air Permeance of Materials |
AR membrane sample
3.3 ft x 3.3ft
(1m x 1m)
|
Air Leakage measured @ 0.52, 1.04, 1.57, 2.09, 3.13, 6.27 psf (25,50,75,100, 150, & 300 Pa)
Air Leakage re-measured at
2.09, 1.57 & 1.04 psf
(100,75, & 50 Pa) to determine if psf/Pa affected Specimen
|
Air Leakage thru AR material reported as cfm/ft2@1.57psf
(L/s/m2 @75Pa)
|
Control Sample:1/2” gypsum board air leakage not exceeding 0.004 cfm/ft2 @ 1.57 psf
(0.02 L/s/m2 @ 75 Pa) |
Type 1: WRB/AR
Type II:AR |
Standard Specification for Air Retarder (AR) Material or System for Low-Rise Framed Building Walls
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Wall Assembly:
-8’x 8’wall (2438 X 2438 mm)
-2 x 4 stud @ 16”o.c. (50 X 102 mm @ 406 mm)
-Solid sheathing noted
-Specimen sealed to vertical edges and if noted by mfg., to top & bottom edges
-1 electrical receptor installed
-Simulate lap siding by installing 1”x 1” (25 mm X 25 mm) wood strips horizontally, 9” (228 mm) vertically
-Simulate brick veneer by installing brick ties 16” x 16” (406 mm X 406 mm) grid to field wall assembly |
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Two Classifications:
Type I, water resistant AR membrane for buildings made of materials affected by moisture
Type II, AR membrane for buildings made of materials “not” affected by moisture |
ASTM
E 283 |
Rate of Air Leakage |
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Determine Air Leakage Rate by maintaining for 1 minute a positive/negative pressure @ 1.57 psf or 75 Pa (25 mph)
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ASTM
E 330
|
Membrane Structural Integrity
|
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Sustain 10.45 psf ot 500 Pa (65 mph) for 1 hour each direction, negative positive pressure testing
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Follow structural integrity
E 330 testing with specimen retested with E 283 for 1 min. at each 1.04, 1.30, 1.57, 1.82 & 2.09 psf
(50, 62, 75, 87 & 100 Pa) to verify air leakage performance |
ASTM
E 331
|
Water Penetration of Assemblies |
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Water Resistance:
0.11 in. H2O @ 0.56 psf or 2.79 mm H2O @ 27 Pa (15 mph) for 15 min.
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Type I Water-Resistant Membrane |
ASTM
E 96
|
Water Vapor Permeance of Materials
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See ICC-ES Acceptance Criteria AC38 |
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Procedure A:
Desiccant Method
-Test chamber @ 73.4°F ± 2°F (23°C ± 2°C) & R/H @ 50 ± 2% |
AC 38 Acceptance Criteria for Water-Resistive Barriers: Procedure A, both control and aged specimens = 5 perms (35 g/ m2/24 hrs) |
Housewrap Code Compliance
Acceptance Criteria for Water-Resistive Barriers
| Performance Property |
Test Standard |
Specimen Size |
Test Procedure |
Test Results |
Performance Requirements |
Dry Tensile Strength
Breaking Force |
- ASTM D 882 or D 5034 polymeric materials
- ASTM D 828 paper-based materials 1,2 |
1in. (25 mm) x 10 in. (250 mm) |
Grip both specimen ends (lengthwise), separate each direction at the rate of 1 in. ± .2 in./min (5.0mm ± 5 mm/min). |
Test reports psi separation, MD/CD for both control and aged specimens |
20 psi minimum (138 kPa) MD/CD
40/35, D 5034 |
| Water Resistance |
- ASTM D 779 “Boat Test” |
Specimen Approximately 5 in. (127 mm) diameter |
One side of test specimen in contact with water, while the dry side contains a dry indicator powder. Examine time for water to pass through specimen |
Report water absorption in minutes |
10 minutes minimum, no water passage |
| Alternative Water Resistance |
- AATCC-127 Hydrostatic Head Test 1,2 |
Specimen 2 in. (50mm) diameter |
Five specimens tested by raising a hydrostatic head to 22 in. (55mm) height for a period of 5 hours |
Control and aged specimens tested for water penetration |
5 hr. minimum, no water passage. Alternative test to equal D 779, 60 min. requirement |
| Alternative Water Resistance |
- CCMC 07102, section 6.4.5 “Water Ponding” 1,2 |
Specimen 10 in (160 cm) |
1 in. (25 mm) tap water on surface of specimen @ 68°F (20◦C) room temperature and 65±3%R/H |
10 specimens, 2 hour test for water penetration |
2 hours, no water passage |
| Water Vapor Permeance |
- ASTM E 96 Procedure A: Desiccant Method 1,2 |
Specimen, either 3 in. to 4.5 in. (76 mm to 114 mm) circumference, or 10 in (160 cm) |
Test chamber @ 73.4°F ±2°F (23± 2°C) & R/H @50±2% |
Test results listed as:-weight gain per hour (g/hr)
- water vapor transmission (g/.m/24hr)
- Permeance (grains per hr. in. Hg.ft2 |
Minimum = 5 perms,(35 g/m/24 hr) No maximum value |
| Pliability |
- AC 38 section 3.3.4 |
10 Specimen strips, 6 in. (150 mm) length by 1 in. (25 mm) width |
Specimens conditioned at 32°F (0°C) for 1 hr. prior to testing. Strips bent over a 1/16 in. (1.6 mm) mandrel through a 180-degree angle. |
Specimens to evidence
no cracking |
No cracking |
(ICC-ES: International Code Council Evaluation Services)
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