A dedicated lower layer for compatible ESTERDAN two-layer waterproofing routes.
Bituminous underlay
This material belongs to the bituminous roofing category. Its position and responsibility must remain clear when it is compared with primers, vapour-control layers, underlays, exposed membranes, drainage products or detailing components.
Four checks before this material enters a build-up.
- 01Confirm the exact function
Check that the product is being used for the technical role shown on this page rather than as a substitute for another layer.
- 02Assess the substrate and attachment
Confirm the support layer, surface condition, preparation and the approved method of bonding, fixing or application.
- 03Coordinate every interface
Review laps, seams, edges, outlets, penetrations, corners, terminations and compatible adjacent materials.
- 04Check current controlled information
Verify the current TDS, DoP, fire data, installation guidance, warranty route and project-specific requirements before use.