Import Breathable Roof Underlay Membrane — Buy in Bulk from Supplier in China

Nantong Kangda Complex Material Co., Ltd. manufactures this breathable roof underlay membrane as a composite barrier for pitched roofing systems, combining a PP spunbond nonwoven layer with polyethylene to create a water-resistant yet vapour-permeable assembly. The membrane is supplied at a width of 100cm, a dimension suited to standard rafter spacings and overlapping installation protocols in both residential and commercial builds. This construction allows liquid water to be shed from the outer surface while permitting water vapour to diffuse outward from the insulated roof space, a balance that mitigates interstitial condensation risk in temperate and humid climates.

The PP spunbond nonwoven provides dimensional stability and tear resistance, while the polyethylene film layer delivers the primary water barrier function; together they form a typical two-ply composite common to Class W1 and Class W2 underlays in European roofing classification, though buyers should confirm the specific hydrostatic head and vapour resistance values for this grade. The 100cm width suggests a roll format that reduces cutting waste on standard roof planes. No specific grammage or tensile strength figures are stated in the listing data, so buyers should request these to compare against EN 13859-1 or ASTM D226 performance benchmarks for their project jurisdiction.

Applications span timber-framed pitched roofs, metal roofing systems, and tile or slate battened roofs where a secondary weatherproofing layer is mandated by building codes. The primary buyers are roofing contractors, timber frame builders, and building materials distributors serving temperate climate zones where condensation management is critical. Trade terms mentioned include FOB and CIF shipment options, with payment by letter of credit or T/T transfer. The response rate from this supplier is currently zero, so buyers should anticipate delayed communication and plan enquiry lead times accordingly.

Nantong Kangda Complex Material Co., Ltd. is located in Nantong City, Jiangsu Province, a manufacturing corridor with established supply chains for technical textiles and polymer composite materials. The supplier carries an imported tier designation and a harbor trust tier, which indicates a baseline verification status within the platform system rather than an independently audited classification. The response rate is recorded at 0.00 percent with an average response time of zero hours, suggesting either a new listing, a dormant account, or a data capture anomaly that buyers should treat as a significant communication risk signal.

The supplier profile does not disclose factory size, year of establishment, annual output, or specific quality management certifications beyond a generic reference to ISO compliance in the source description. No named clients, export markets, or case studies are provided. Buyers evaluating this supplier should request direct evidence of manufacturing capability, quality control protocols, and relevant test reports for the specific membrane grade before committing to trial orders. The location in Nantong offers proximity to Shanghai Port for export logistics, a practical advantage for containerised shipment.