Anderson Premium SBS Torch-On Underlay is intended for use an full bond underlay in a high performance bituminous built-up roofing systems.
The material consists of a high strength polyester reinforced SBS-modified bituminous membrane. The polyester fleece is saturated and then coated in SBS-modified bitumen. Both the upper and lower surfaces are finished with a thermofusible film to prevent sticking in the roll.
Features & Benefits
- Requires less heat to apply.
- Polyester reinforced.
- Superior bond strength with film selvedge.
- Underlays and capsheets available.
||Premium SBS Torch-on Underlay
||1m x 10m
Surface Preparation & Application
All surfaces to receive Premium SBS Torch-on Underlay must be smooth, clean, dry and free from all contaminates that may affect the adhesion and performance of the membrane. Surfaces must be free of sharp projections and mechanical fixings must be well driven to prevent damage to the membrane. Substrates must be primed with an Icopal bitumen primer and left to dry completely prior to the application of the waterproofing.
Premium SBS Torch-on Underlay membranes are applied by torch-on application using a standard roofer’s torch. The membranes should be heated carefully ensuring the heat dispersible film on the underside is completely removed. Lap joints must be completely sealed and checked for security as work proceeds ensuring a continuous 5 mm bead of bitumen is extruded from all laps. Side laps must be a minimum 75 mm with end laps a minimum of 100 mm. The cap sheet side laps should be offset 300 mm from the underlay to avoid a build-up of overlaps; end laps should also be offset.
Icopal Insured Guarantees for up to 20 Years
When installed to Icopal’s specification and by an Icopal approved contractor, comprehensive insured guarantee cover for up to 20 years is available.
Further information on the different levels of guarantee cover.