OEM Waterproof Breathable Membrane (House Wrap)
PAC KING Waterproof Breathable Membrane is engineered from high-performance spunbonded polypropylene (PP) composite polymers backed by certified laboratory testing (GB/T and JC/T standards). Utilizing advanced micro-porous diffusion, it permits trapped moisture to escape efficiently while blocking liquid water up to 1500 mm/2h, protecting exterior insulation and increasing building longevity.
Technical Specifications & Laboratory Standard Data
Rigorous physical and chemical performance metrics tested in accordance with national and industrial standards (GB/T 328, GB/T 1037, and JC/T 2291).
| Technical Parameter / Unit | Type I | Type II | Type III | Testing Standard |
|---|---|---|---|---|
| Max Tensile Strength (N/50mm) - Longitudinal (MD) - Transverse (XD) | ≥130 ≥80 | ≥180 ≥140 | ≥260 ≥200 | GB/T 328.9-2007 |
| Elongation at Break (%) | ≥ 10% | GB/T 328.9-2007 | ||
| Nail Tear Strength (N) | ≥ 40 | ≥ 60 | ≥ 120 | GB/T 328.9-2007 |
| Water Resistance (Hydrostatic) | 1000 mm / 2h | 1000 mm / 2h | 1500 mm / 2h | GB/T 328.10-2007 |
| Low-Temperature Flexibility | -30°C, No Cracks | GB/T 328.15-2007 | ||
| Water Vapor Transmission Rate | ≥ 1000 g/m²/24h | ≥ 300 g/m²/24h | ≥ 200 g/m²/24h | GB/T 1037-2021 |
| Anti-UV Exposure Window | 4 Months | JC/T 2291-2014 | ||
| Heat Aging Resistance (80°C × 168h) | Appearance: No powdering, no delamination Tensile Retention ≥ 80%, Elongation Retention ≥ 70% | JC/T 2291-2014 | ||
Core Application Scenarios & Installation
Designed as a critical exterior weatherization barrier for timber frame, steel structure, and high-performance building envelopes.
1. Exterior Wall & Roofing Weatherization
Installed directly on the outer surface of insulation materials. It prevents wind-driven rain and snow melt from infiltrating wall cavities while facilitating internal vapor dissipation.
2. Passive House & Energy-Efficient Sheathing
- Air-Tightness Control: Exceeds standard blower-door airtightness requirements when sealed at lap joints.
- Condensation Mitigation: Rapidly expels residual construction moisture to eliminate structural wood rot and mold.
- Extreme Weather Durability: Maintains structural flexibility and nail-holding integrity down to sub-zero temperatures (-30°C).
7 Unique Engineering Advantages
Aged Thermal Stability
Withstands long-term exposure at 80°C with tensile retention rates above 80%.
Sub-Zero Flexibility
Certified safe for installation down to -30°C without surface cracking or brittleness.
High Tensile & Tear Security
Type III variants offer up to 260 N/50mm tensile strength and 120 N nail tear resistance.
Anti-Mold & Anti-Bacterial
Inhibits biological decay and fungal growth within enclosed building cavities.
Chemical Resistance
Resistant to alkalis, acids, and preservative chemicals present in treated lumber and mortar.
100% Recyclable Polymer
Produced from pure polyolefin non-woven compounds aligned with green building codes.
OEM Customization & Factory Direct Supply
PAC KING delivers fully tailored roll dimensions, custom print alignment grids, and private-label packaging for international distributors.
Custom Grid & Logo Printing
Precision alignment lines and brand watermarks printed directly onto the outer membrane face.
Customized Roll Widths & Grammage
Available in specialized fabric weights and standard widths from 1.0m to 3.0m per project requirements.
Export Container Logistics
Secure palletized and shrink-wrapped packaging optimized for 20ft and 40HQ maritime container delivery.
Frequently Asked Questions (B2B Procurement)
How do the Type I, Type II, and Type III specifications differ?
They differ primarily in mechanical strength and vapor diffusion properties. Type III offers maximum tensile strength (260 N/50mm) and higher hydrostatic resistance (1500 mm/2h) for heavy-duty commercial construction, while Type I and II balance high vapor permeability with standard structural loads.
Where should the waterproof breathable membrane be installed?
It must be installed on the EXTERIOR side of the thermal insulation layer. For a complete envelope system, it should be paired with a matching interior vapor barrier membrane on the warm side of the wall.
What tape should be used for lap seams?
We recommend using PAC KING Outdoor Waterproof Breathable Seaming Tape with an overlap of at least 10cm to ensure continuous air and water tightness across all joints.
Do you offer OEM private label manufacturing?
Yes, full OEM private label options, including custom color, surface branding, and retail packaging, are available for wholesale container orders.
Get Wholesale Quotes for PAC KING Breathable Membrane
Contact our sales engineers today for full laboratory test reports, free physical samples, and container shipping quotations.
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