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Waterproof Retaining Wall Liquid Membrane :  

Duromastic BLW Butimen modified latex liquid membrane 
is a liquid applied, latex modified bituminous elastomeric waterproofing membrane which, when fully cured, forms a permanently flexible waterproof lining to most building surfaces including reinforced concrete, block work, brick work and cement render. Clean up with water before dry.  Package: 20 litres.
Principle Characteristics:
Single component, user friendly.
Simple application - brush, roller or spray
Excellent elasticity.
Low odour, non toxic water based
Fast curing
Use Areas:
Retaining Walls
Planter Boxes


Purple when wet , dries black

Weather resistance

Should be protected from sunlight

Touch Dry

2-4 hours @25  C

Recoat Time

4-6 hours @25  C


Masonry - 1.8-2.0L/ m2 or 3 coats @ 0.6L/m2 each


Concrete - 1.5-1.8L/ m2 or 2 coats @ 0.9L/m2 each

Wet Film per coat

0.9mm thick

Dry Film Thickness

1.0mm minimum

Elongation @ break

>300% at 25  C

Solids Content

58% by volume

Shelf Life

12 months in unopened container @20  C




Concrete must be cured for a minimum of 28 days and render 7 days. Remove dirt, dust, loose particles, oil and unsound concrete etc. Water blast if necessary. Surface must be dry. Fill holes and open joints in block work or concrete prior to application of membrane.      


It is self priming when used on most surfaces e.g. Sound concrete, block work. Surfaces may be primed with BLW thinned with 50% water . Areas subject to rising damp should be first sealed with an epoxy coating .
Apply a bead of elastomeric sealant (eg. Neutral-cure silicone) to the following areas: Wall / footing junction where movement is expected and expansion joints, generally to all places where movement is likely to occur.



A reinforcing fabric such as 140-200mm wide polyester bandage should be used over the following areas: expansion joints, cracks, footing / floor to wall junctions, around floor/wall penetrations, and any other area movement will occur. Reinforcement is also required over construction joints in walls.
Reinforced: To the prepared surface apply a heavy coat of BLW by brush or roller at approximately 2m2/litre. Immediately lay the reinforcing fabric into the wet surface, then apply another coat and work in carefully by brush or roller to saturate the fabric. When dry apply one or more coats to give a fully waterproof lining. Ensure a minimum coverage of 1.6litres/m2. When dry, check for pinholes or misses and recoat if necessary.
Un-reinforced: To areas where a reinforcing fabric is not utilised apply 3 coats of BLW at a total rate of 1.8 litres/m2 ensuring full coverage, by brush, roller or spray (use 21 thou Min tip size + airless spray).
Porous Surfaces (Masonry): May require 3 coats to obtain a satisfactory dry film thickness.
Do not apply above 32 C or below 10 C ambient temperature. Be sure coating will cure before contract with water. Wash equipment with water before dry. Protect BLW from extended sunlight exposure. Planter box membrane must be fully cured before being subject to moisture or soil. Protect membrane against damage before and during backfilling or covering. Wrimco protection board may be used where suitable. Use an approved drainage system and protection board in planter boxes and retaining walls before filling to protect membrane from any damage. Do not expose to solvents 



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