Product Overview
IKO TGX Torch-On SBS Underlay supplied in a 16m² roll, manufactured as a durable waterproofing base layer for flat and low-pitched roofing systems.
Reinforced with a strong polyester core and modified with SBS elastomeric bitumen, this underlay delivers flexibility, dimensional stability, and long-term resistance to cracking.
It forms the essential first layer in multi-layer torch-on systems, creating a robust waterproofing foundation beneath mineral-finished capsheets.
Suitable for both new build applications and roof overlays, the TGX Underlay provides dependable performance in domestic, commercial, and industrial flat roofing projects.
Features & Benefits
- SBS-modified bitumen: Enhances flexibility, impact resistance, and cold weather performance.
- Polyester reinforcement: Provides dimensional stability and strength under load.
- Waterproofing base: Acts as the foundation layer beneath cap sheets.
- Torch-on application: Creates a secure bond and continuous watertight layer.
- Versatile use: Suitable for both new build roofing and overlay refurbishment.
- High coverage: 16m² roll maximises efficiency for medium to large roof areas.
Applications
- Flat roofing systems: Base layer in multi-layer torch-on bituminous systems.
- New builds: Provides initial waterproofing foundation beneath mineral capsheets.
- Overlay projects: Suitable for refurbishing existing bituminous roofs.
- Commercial and industrial: Applied in large flat roof developments.
- Residential roofing: Used in garages, extensions, and garden buildings.
Installation Guidance
- Preparation: Ensure roof deck or existing surface is sound, dry, and secure.
- Torch-on method: Apply heat to the underside bitumen, bonding to the substrate or separating layer.
- Laps: Maintain minimum 75mm side laps and 100mm end laps for integrity.
- Ventilation: Where overlaying existing roofs, ensure trapped moisture is avoided.
- Safety: Observe hot works safety standards when using propane torches.
Compliance & Performance
- Material: SBS-modified bitumen with polyester reinforcement.
- Coverage: 16m² per roll.
- Function: Designed as a waterproofing base underlay for cap sheets.
- Durability: Resistant to cracking, movement, and long-term weathering.
- Application: For torch-on use only, requiring competent installation.
- Important note: Must always be overlaid with a suitable capsheet to complete the roofing system.