BC Bitumen Coating is a bitumen emulsion composed of selected grades of flexiblebitumen. Dark brown in colour drying to a black flexible coating. When dry, it will not re-emulsify in water.

USES
To provide a waterproof membrane on structural reinforce concrete not exposed to UV, for example retaining walls
As a priming coat for bituminous membranes.

The film of BC Bitumen Coating has no significant tendency to creep and has greatstability over a wide range of temperatures. The coating is flex-ible and jointless.Application requires no special skill and it may be brushed or sprayed on to anyinclination of surface. BC Bitumen Coating may be applied to:
Cement/sand rendering
Reinforced concrete
All types of concrete blocks
All clay and calcium silicate blocks
Asbestos cement sheeting
Cement paint

PRODUCT DATA

Priming coat: 0.075 – 0.1 kg/m2 (dilute 1:1 with clean water)
Neat coat: 0.6 kg/m2

SUBSTRATE PREPARATION

- New Concrete, Screed or Render: Should have a brushed or wood float finish, and should be free from contaminationby any material that could impair adhesion. All surface defects should be repaired by approved methods.  Protrusions greater than 3 mm should be removed.

- For Old Painted Surfaces: Loose material and/or organic growth must be removed with a stiff bristle (not wire)brush and spores should be killed with a suitable fungicide which should bescrubbed in, left for 24 hours and washed off with clean water.

- Where surfaces are chalking and friable, remove all loose material, liber-ally applystabilising solution and allow to dry for at least 24 hours. Cracks should be made good, allowed to dry and then covered with BC Bitumen Coating into which isembedded open weave glass fibre scrim. Spalled concrete should be made good.

- Application Temperature:Not below +5°C

APPLICATION INSTRUCTIONS

- Mixing: As a priming coat, add an equal volume of clean water and stir well.  For the neat coat, the material is ready for use from the can after stirring thoroughly.

- Application Method/Tools: Ensure substrate is thoroughly dry before applying BC Bitumen Coating.

Scrub in the priming coat to give a dense overall cover and allow to dry. The second coat shall be applied evenly and thickly with a well loaded brush and allowed to dry.Touch in any ‘misses’ the following day. Wash brush frequently in clean water toprevent clogging and wipe off splashes immediately with clean water. Do not apply in wet weather or in direct sunlight.

- Setting or Drying Time: Under normal conditions, 4 –6 hours but a period of 24 hours should be allowed between coats (it may be considered dry when rubbing with a wet finger does notproduce a brown stain).

- Notes on Application/Limitations: Scaffolding must be independently tied to allow uninterrupted application.  Any faults in the structure, particularly those which may lead to moisture penetration must berectified.