L-Type Backed TPO Membrane Non-Woven Fabric Backing, Fully Adhered Roofing for Concrete & Aged Asphalt
1. Product Overview
Type L Backed TPO Waterproof Membrane is a dedicated full-adhesion single-ply roofing material, manufactured in accordance with GB 27789-2011, ASTM D6878 and FM fully adhered system standards for global applications. Featuring a dual-layer thermally composite structure, it integrates a high-performance homogeneous TPO top layer and a thermally bonded polyester non-woven backing.
Made of eco-friendly PP and EPDM blends, this halogen-free, plasticizer-free and fully recyclable TPO membrane contains no harmful volatiles. The non-woven backing greatly boosts adhesion to concrete and cured asphalt substrates, preventing hollowing, blistering and peeling. With high solar reflectivity for cool roof energy efficiency and superior outdoor weather resistance, it is exclusively designed for fully adhered roofing systems, incompatible with mechanical fastening or loose-laid installation. Paired with Type H and Type P TPO membranes, it forms a complete single-ply waterproof system for new concrete roofs and aged roof renovation projects.
2. Product Structure & Technical Specifications
Product Structural Features
Manufactured via integrated thermal composite technology, the product combines a UV-resistant homogeneous TPO surface layer and a high-density polyester non-woven base layer. The two layers are thermally fused as an integral body without delamination or debonding risks. The TPO top layer is incorporated with professional anti-UV, anti-oxidation and weather-resistant additives to sustain stable physical performance during long-term outdoor exposure. The dense non-woven backing fully absorbs dedicated adhesive, delivering high bonding strength and outstanding substrate adaptability for full-adhesion construction.
Core Technical Parameters
Certifications & Standards: GB 27789-2011, ASTM D6878, FM fully adhered system certification; complete test reports available
Available Thickness: 1.2mm, 1.5mm (custom thickened specifications supported)
Standard Width: 1.5m, 2.0m
Standard Length: 20m, 30m (custom extra-long rolls available)
Cool Roof Performance: Off-white standard color; Solar reflectance ≥0.80, Thermal emittance ≥0.85, fully compliant with international cool roof energy-saving standards
Temperature Resistance: No cracking at -40℃, no sagging or deformation at 80℃, stable high and low temperature dimensional performance
Welding Performance: Full-surface hot-air weldable; weld seam strength ≥ base membrane strength for seamless integral waterproofing
Mechanical Properties: Tensile strength ≥10 MPa, Elongation at break ≥500%, Puncture resistance ≥200 N (GB/T standard)
Thermal Aging Resistance: Mechanical property retention ≥90% after 28-day constant temperature aging at 80℃
Backing Bonding Performance: Polyester non-woven fabric weight ≥80g/㎡, substrate bonding strength ≥1.5N/mm
Service Life: More than 20 years for standard exposed roofing applications
3. Core Product Advantages
Enhanced Non-woven Backing, Stable Full-adhesion Performance
The high-density polyester non-woven backing features strong adhesive absorption and excellent fitting performance on concrete and aged asphalt substrates. It effectively avoids common construction defects including blistering, hollowing and edge warping, ensuring flat, firm and long-lasting bonding for professional fully adhered single-ply roofing systems.
Seamless Hot-air Welding, Long-term Waterproof Stability
The homogeneous TPO surface layer supports full hot-air fusion welding. All lap joints integrate seamlessly with the base membrane without capillary leakage gaps, preventing seam cracking and water seepage. It maintains stable, continuous waterproof performance for long-term outdoor exposed roofing conditions.
Eco-friendly Formula & Multi-corrosion Resistance
Halogen-free, plasticizer-free and eco-friendly, this recyclable material will not corrode building substrates or insulation layers. It delivers excellent resistance to acid, alkali, oil stains and rain erosion, adapting to harsh working conditions of aged asphalt and modified asphalt roofing projects.
High-reflective Energy Saving & Super Weather Durability
This high-reflective cool roof membrane adopts an off-white finish to reduce rooftop heat accumulation and cut building energy consumption. Built-in UV and ozone resistant additives prevent chalking, fading and cracking, enabling long-term maintenance-free outdoor service with superior weather durability.
Complete System Matching & Wide Engineering Adaptability
It is fully compatible with complete TPO single-ply roofing systems. Type L non-woven backed TPO applies to large-area full-adhesion main roofs, while matching Type H TPO for detailed flashing and Type P reinforced TPO for high wind-load roofs, forming a complete and reliable building waterproof solution.
4. Application Scenarios
Concrete Roof Waterproofing: Fully adhered waterproofing for new concrete flat roofs, basement roof slabs and public building concrete roofs.
Asphalt Roof Overlay & Renovation: Direct overlay construction on aging SBS Waterproof Membrane and asphalt roofs without full demolition, greatly reducing renovation costs and shortening construction cycles.
Low-slope & Low-load Limited Roofs: Ideal for lightweight roof structures that cannot bear mechanical fastening, ballasting or loose-laid construction.
Auxiliary Building Roofs: Exposed roof waterproofing for pump houses, podium buildings and various medium and small auxiliary industrial & civil buildings.
5. Standard Construction Guidelines
Substrate Treatment
Keep the base solid, flat, dry and clean, free of dust, oil stains and sharp protrusions. Ensure asphalt substrates are fully cured and concrete moisture content stays below 9% to guarantee stable bonding quality.
Construction Environment
The optimal construction temperature is above 5℃. Preheat substrates and membranes in low-temperature environments. All construction is prohibited in rainy, snowy, windy and foggy weather to ensure qualified welding and bonding effects.
Lap Width Standard
Reserve longitudinal lap width ≥80mm and transverse lap width ≥120mm, adjustable according to project design and wind load requirements.
Hot-air Welding Process
Use professional TPO hot-air welding equipment at 500–600℃ with a travelling speed of 1.5–2.5m/min. Complete trial welding and peel tests before bulk construction, then tightly roll welded seams to exhaust air for full fusion.
Full Adhesion Operation
Evenly apply dedicated TPO adhesive with a toothed scraper at 0.5–0.8kg/㎡. Keep the non-woven backing clean and oil-free, then laminate and compact the membrane to achieve full, uniform bonding.
Key Node Reinforcement
Reinforce key nodes including internal and external corners, pipe roots, expansion joints and equipment bases with 150–300mm wide Type H homogeneous TPO membrane to eliminate nodal leakage risks.
Edge Sealing & Finishing Protection
Fix metal termination trims at all membrane edges and seal with special TPO sealant to prevent edge warping and water infiltration. Avoid walking, stacking materials or other construction activities within 24 hours after completion to protect adhesive layers and welded seams.
6. FAQ
Q1: What is the main feature of Type L backed TPO membrane?
A1: It comes with polyester non-woven fabric backing, designed exclusively for full adhesion installation. It bonds firmly to concrete and aged asphalt roofs without blistering or peeling.
Q2: What is the difference between Type L, Type H and Type P TPO?
A2: Type L is for full-adhesion main roofs; Type H homogeneous TPO is for complex flashing details; Type P reinforced TPO features high wind resistance for high-wind areas. They can be used together as a full waterproof system.
Q3: Can it be installed via mechanical fastening or loose laying?
A3: No. This membrane is only suitable for fully adhered construction. It is the best choice for lightweight roofs that cannot bear fasteners or ballast.
7. Product Summary
Compliant with GB 27789 and ASTM D6878 standards, Type L Non-woven Backed TPO Waterproof Membrane is a professional fully adhered single-ply roofing material. Its polyester non-woven backing delivers stable bonding for concrete and aged asphalt substrates. With eco-friendly formula, cool roof energy-saving performance, corrosion resistance and seamless hot-air welding, it matches Type H and Type P TPO to form a complete waterproof system, serving as the preferred solution for new concrete roof waterproofing and low-load old roof renovation projects.
