Bit-Seal 1K Extra

One-component, solvent-free, quick-drying, low-shrinkage, high-yield, high flexibility bitumen waterproofing emulsion containing polystyrene spheres and rubber granules.

Product Description

Bit-Seal 1K Extra is a solvent-free paste consisting of selected water-emulsified bitumen, special fine-graded aggregates and admixtures. Bit-Seal 1K Extra thixotropic consistency makes it easy to use for waterproofing even vertical and sloping surfaces. When completely dry Bit-Seal 1K Extra forms a waterproof plastic coating that is resistant to re-emulsifying after prolonged immersion in water, even when slightly acid or alkaline, and resistant to aggressive agents present in the soil. Bit-Seal 1K Extra meets the requirements for polymer modified bituminous thick coatings, in compliance with EN 15814.

Field of Application

For waterproofing and protecting:

• Waterproofing foundations.

• Waterproofing bearing walls.

Product Details

Product identity

Consistency: paste
Colour: black
Density (g/cm³): 1.25
pH: 10
Brookfield viscosity (mPa•s): 45,000
Dry solids content (%): approx. 80


Bit-Seal 1K Extra is supplied in:
– 5 kg plastic buckets
– 20 kg plastic buckets


The approximate consumption is 1 – 1.5 kg/m2

Application Procedure

Preparing the substrate

The substrate to be treated must be mechanically robust and clean. Remove all cement laitance, traces of powder, flaky parts, grease, oil, and form release agents by sandblasting or washing down with a high-pressure water pump. If the substrate to be waterproofed and protected with Bit-Seal 1K Extra is in poor condition, remove the damaged parts manually or mechanical abrasion by using a hydro-demolition system or a hydro-scarified. The last technique, which uses high-pressure water, is recommended because the reinforcement rods are not damaged. The structures that are not subject to vibration could cause small cracks in adjacent concrete. Once the rust has been entirely removed by sandblasting, repair with a pre-blended repairing mortar. Absorbent surfaces to be treated with Bit-Seal 1K Extra must be primed with Bit Seal Primer. Existing floors, which are covered in tiles, must be well bonded to the substrate, and the surface of tiles must be free of substances that could compromise the adhesion of Bit-Seal 1K Extra, such as oil, grease, paint, wax, etc. In order to remove material that could affect the adhesion of Bit-Seal 1K Extra, clean the floor with detergents and water. After this, the surface must be treated with Bit Seal Primer.

Preparing the product

Ready to be used.

Applying the product

Bit-Seal 1K Extra must be applied in two layers with a brush or a long-haired roller. Before applying the second layer, wait until the first coat is dry, making sure the product becomes darker with a matt finish. The second layer is applied diagonally to the first one. The final thickness of the two layers of Bit-Seal 1K Extra must be at least 0.8 mm to create a solid, flexible, and continuous film. Ensure there are no interruptions in the film caused by imperfections in the substrate.