Cromar Cromaprufe

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£18.44 ex. VAT

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  • Suitable For: use as a waterproof membrane for concrete and brick foundations
  • Area of use: EXT
  • Application Method: brush
  • Volume: 5L 25L
  • Container Type: tin
  • Type: waterproofer
  • Colour: vrown (dries black)
  • Brand: Cromar
  • Manufactuer: Cromar
  • Box Size: Single Box
Data Sheets

Download Tech Data

Cromar Cromaprufe is a rubberized bitumen emulsion utilized for general purposes. It is commonly applied on both walls and floors to prevent water ingress and dampness originating from the ground. Additionally, it doubles as an effective adhesive for wood block floors.

 

 

 

For more information on our range of bitumens, please click here. Alternatively, for our full range from Cromar, click here.

For more information on Cromar, you can visit their website here.

 

 

Cromar Cromaprufe serves as a waterproof membrane for concrete and brick foundations, retaining walls, and bridge abutments, effectively shielding them against water penetration. It offers protection against sulphate attack from soil. Additionally, Cromaprufe functions as a versatile waterproofer for both floors and walls. Moreover, it demonstrates excellent adhesive properties, facilitating the bonding of wood block and wood mosaics, expanded polystyrene, and cork tiles. Furthermore, Cromaprufe provides a suitable surface for plaster application on challenging surfaces.

 

APPLICATION

  • Surface Preparation:
    • Ensure all surfaces are sound, stable, and free from dust, dirt, grease, oil, and loose matter.
    • Cromaprufe can be applied to damp surfaces, but not waterlogged ones.
    • Porous and hot dry surfaces should be dampened with clean cold water prior to application to assist with product application.
  • Application Instructions:
    • Stir Cromaprufe well before use and apply it by brush.
    • Avoid applying Cromaprufe to external surfaces during wet weather or if rain is expected, and ensure good ventilation in confined areas.
    • Allow each coat to dry completely before applying the next coat in multi-coat applications.
  • Waterproofing and Protection:
    • Apply 2 coats of Cromaprufe at a rate of 2m² per liter for waterproofing structures such as foundations, retaining walls, and bridge abutments.
    • Ensure the coating extends to meet the damp-proof course in the base or wall when treating foundations.
    • Cromaprufe can be applied to green concrete surfaces immediately after shuttering removal to serve as a curing membrane, with 48 hours recommended before back-filling.
  • Concrete Beams and Columns:
    • Apply 2 coats of Cromaprufe at a rate of 2m² per liter to provide a damp-proof membrane on concrete beams and columns before cladding with rendering, masonry, or brickwork.
    • After the second coat becomes tacky, blind it with 1 to 2 mm stone chippings or clean sharp sand.
  • Walls:
    • Address rising dampness by inserting a damp-proof course or repairing the existing one if suspected.
    • For exterior walls, remove dirt, dust, and grease, level uneven surfaces with cement mortar, and apply three coats of Cromaprufe at a rate of 2m² per liter, with the final coat blinded with clean sharp sand while tacky.
  • Interior Walls:
    • Remove wallpaper, loose paint, dirt, dust, and grease, and repair damaged plaster.
    • Apply two coats of Cromaprufe at a rate of 2m² per liter to moderately damp interior walls, leaving a section untreated for moisture evaporation.
    • Avoid using gloss paints or oil-based products for decoration over Cromaprufe; instead, use emulsion paints and wallpapers after hanging a lining paper fixed with cellulose paste.
  • Floors:
    • For sandwich construction in severe conditions with penetrating damp, apply two coats of Cromaprufe at a rate of 1m² per liter to a clean concrete subfloor, and blind the second coat with clean sand.
    • Take the Cromaprufe membrane up walls to marry with the damp-proof course and ensure it remains intact before laying a floor covering.
  • Surface Treatment on Existing Floors:
    • Apply a priming coat of diluted Cromaprufe at a rate of 7.5m² per liter, followed by two coats at a rate of 1m² per liter, ensuring each coat reaches the existing damp-proof course.
    • Do not use Cromaprufe as the final surface for pedestrian traffic; it should always be covered by a suitable floor covering material.
  • Wood Blocks and Wood Mosaics Adhesive:
    • Treat the floor as described above if damp conditions are expected.
    • Prime the surface lightly with clean cold water, then dip wood blocks separately into Cromaprufe and press firmly into place, excluding air.
    • For wood mosaic panels, spread Cromaprufe onto the screed at a rate of 0.8m² per liter and immediately place the panels into position.
  • Plastering on Difficult Surfaces:
    • Apply two thin layers of Cromaprufe at a rate of 4.5m² per liter each to surfaces with poor keying properties, such as gloss-painted walls or old tiles.
    • Blind the second coat with clean sharp sand while tacky and allow it to dry for 48 hours before plastering according to plaster manufacturers’ recommendations.

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Type of window frame material Minimum witdth of joints
for a butled mounting b in mm
Minimum witdth of joints
for a inner mounting b in mm
Hard PVC (white) 10 15 20 25 10 10 15
Hard PVC and PMMA (dark)
(colour extruded)
15 20 25 30 10 15 20
Hard PUR integral foam 10 10 15 20 10 10 15
Wood-aluminium-window 10 10 15 20 10 10 15
Aluminium-plastic sandwich
frame (bright)
10 10 15 20 10 10 15
Aluminium-plastic sandwich
frame (dark)
10 15 20 25 10 10 15
Wooden window frame 10 10 10 10 10 10 10
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