Cromar Bitumen Primer for Torch-On Felt - 1L
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Details
Cromar Bitumen Primer for Torch-On Felt - 1L is a bitumen primer for felt / bituminous flat roof system applications, helping create reliable waterproof protection on flat roofs.
This bitumen primer is used as part of a built-up felt roof system to create layered waterproof protection. It is commonly used on garages, extensions, dormers, porches and outbuildings, either over new OSB/plywood decking or suitable existing felt overlays where the full system allows.
Best for
- Built-up felt flat roof systems
- New boards or compatible existing felt overlays
Key features
- Brand: Cromar
- For use on metal, concrete, asbestos cement, slate, lightweight concrete screeds, roofing felt & asphalt
- Can be applied to damp (not wet) surfaces
- Cromar Bitumen Primer shoud be applied evenly in one coating
- Resistant to water within 20 - 30 minutes
- Concrete Surfaces: 6 - 8m² per L
- Lightweight concrete screeds and asbestos cement: 3.5 - 5m² per L
- Designed for long-lasting waterproof protection when installed as part of the correct system
- A low viscosity, high penetration, cold applied bituminous solution designed to prime and seal porous roof surfaces prior to the application of bituminous materials.
- Can be applied by brush or spray
- One coat application
- Available sizes: 1L, 5L or 25L
Typical applications
- Metal Surfaces: 6 - 12m² per L
Application / installation
- Trade-only installation advised because torch-on work involves hot works and fire risk
- Install in dry, suitable conditions unless the specific product states damp-weather application is allowed
- Surface must be clean, sound and prepared before application
- Allow for laps, overlaps and correct layer sequencing in the felt system
System components / used with
- Torch-on cap sheets, underlays and venting/base layers
- Bitumen primer, felt adhesive or mastic where specified
- OSB/plywood decks or compatible existing felt overlays
- Gas torch equipment and suitable PPE for hot works
Coverage
- Metal Surfaces: 1 x 1kg tin covers 6 - 8m²
- Metal Surfaces: 1 x 5L tin covers 30 - 40m²
- Metal Surfaces: 1 x 25L tin covers 150 - 200m²
Technical details
- Cromar Bitumen Primer seals porous substrates and promotes the adhesion of bituminous waterproofing systems and sheet coverings.
Drying time
- Drying:
Things to consider before buying
- Check substrate compatibility before ordering: OSB, plywood, concrete and existing felt overlays may need different preparation
- Install in dry conditions and avoid unsuitable cold temperatures unless the product data allows otherwise
- The surface must be clean, dry and free from loose material before application
- Hot works require suitable fire safety precautions and should be carried out by trained users
Technical specification
Contents
- Metal Surfaces: 1 x 1kg tin covers 6 - 8 m/2
- Metal Surfaces: 1 x 5 litre tin covers 30 - 40 m/2
- Metal Surfaces: 1 x 25 litre tin covers 150 - 200 m/2
Coverage
- Metal Surfaces: 6 - 12 m/2 per litre
- Concrete Surfaces: 6 - 8 m/2 per litre
- Lightweight concrete screeds and asbestos cement: 3.5 - 5 m/2 per litre
Drying times
- It is essential after priming concrete or screeded surfaces that the coating is free of solvent therefore a drying time of 2 hours should be allowed
Technical
- Cromar Bitumen Primer shoud be applied evenly in one coating
- Resistant to water within 20 - 30 minutes