Wall Membrane and Housewrap Manufacturer
KOSITE is an Indonesia housewrap manufacturer and building wrap supplier producing vapor permeable housewrap and exterior wall WRB rolls for commercial building wrap, OEM, private-label and export programs.
Controlled Membrane Grades and Technical Data
Three-layer PP nonwoven / breathable film / PP nonwoven. Standard roll: 1.50 m x 50 m (75 m²). Nominal basis weight tolerance: ±5%. The linked TDS defines the application, test methods, tolerances and limitations for each grade.
| Grade / nominal mass | Intended application | Water tightness | Sd maximum (m) | Tensile MD / transverse (N/50 mm) | Controlled source |
|---|---|---|---|---|---|
| 100 g/m² | Wall WRB / housewrap | W1 | 0.012 | 150 / 100 ±15% Measured MD / TD |
KOS-TDS-WM100-2026, Rev. 01 PDF |
| 150 g/m² | Wall WRB / housewrap | W1 | 0.012 | 225 / 150 ±15% Measured MD / TD |
KOS-TDS-WM150-2026, Rev. 01 PDF |
Water tightness: EN 1928, Method A. Sd: EN ISO 12572. Tensile: EN 12311-2 for the wall grades; EN 12311-1 / EN 13859-1 for the roofing grades. Values from different test methods must not be treated as interchangeable. These TDS do not declare a reaction-to-fire classification.
A wall grade is not automatically a roof underlay, and a breathable underlay is not a vapour barrier. Confirm the current controlled revision and the approved assembly before ordering. Custom grades and roll formats require separate specification approval.
Compatible Membrane Tapes and OEM Supply
Choose accessories for the actual membrane, substrate and joint. A seam tape, concealed-lap butyl tape and window flashing tape serve different details; none replaces the approved drainage and flashing design.
- Breather membrane joint tape and housewrap / WRB seam tape: for compatible membrane overlaps; select a separate approved flashing construction for window and door openings.
- Butyl membrane sealing tape: discuss double-sided concealed-lap tape or backed flashing construction for the intended interface.
- Vapor-permeable housewrap and wall WRB and roofing underlayment: confirm the selected grade and compatible accessory together.
For European and US private-label tape supply, send the destination market, application, membrane sample, tape width and length, quantity, label artwork and packaging requirements. Confirm available constructions, MOQ, lead time and applicable technical documents with the quotation.
Discuss an OEM membrane and accessory program or request tape samples and a specification-based quotation.
Where Wall WRB and Housewrap Fit
- Designed for exterior walls where the system needs a continuous water-resistive layer behind cladding or siding.
- Helps manage exterior liquid water while supporting outward drying when the wall assembly uses a vapour-permeable design.
- Roll weight, width, color, printing and export packing can be matched to a distributor or private-label program.
How to Select Housewrap and WRB
- Start with the wall build-up: cladding type, sheathing, drainage cavity, insulation position and expected construction exposure determine the suitable membrane construction.
- Compare water resistance, vapor permeance, tensile and tear performance together. GSM alone does not define installed wall performance.
- A reflective foil layer and a vapour-permeable WRB are different constructions. Confirm whether the project needs outward drying or vapor control before comparing foil products.
- The membrane must stay continuous at laps, corners, windows, penetrations and base details with compatible tape and flashing.
Wall WRB Specification Checklist
- Confirm the wall build-up, cladding type, drainage cavity and the expected construction-exposure period.
- Define the water-resistance, vapor-permeance, tensile, tear and exposure data required by the project specification.
- Confirm whether the selected membrane is only a WRB or is also part of a tested air-control detail.
- Set GSM, roll width, roll length, color, printing, labels and export packing before quotation.
- Review the applicable data sheet, test references and destination-market requirements for the selected construction.
- Approve a sample and verify tape, flashing, sealant and substrate compatibility before bulk production or installation.
Related Technical Resources
Use these application notes with the selected product data sheet and project specification.
Five Technical Factors for Housewrap and WRB Performance
A buyer-focused check of water resistance, vapor permeance, detailing and mechanical durability.
WRB Installation Guide for Water-Managed Wall Systems
Window flashing, drainage-plane continuity and practical wall-installation guidance.
How Waterproof Breathable Membranes Work in Walls and Roofs
A clear explanation of liquid-water resistance and vapor diffusion.