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Watco Liquid Roof Membrane Anti Slip

Reinforced anti slip waterproof protection for flat roofs

  • Ultra-tough, UV resistant membrane
  • Fibre-reinforced for extra protection and durability
  • Highly flexible – won’t split with roof movement
  • Excellent slip resistance even in the wet
Delivery options
Next day delivery slots available upon request. Call us on 01483 418418 for details.
Frequently bought together


Anti Slip Liquid Roof Membrane provides extra safety for maintenance or emergency access routes. It can be easily applied around existing pipe work and protrusions, with an inert fibre reinforcement it protects around these areas where the risk of water leakage is high. Two coats will cure to give a tough, 1-1.5mm thick sealing membrane. Its high elasticity allows the roof to move without the membrane splitting or cracking.

Recommended areas of use

  • Seals and protects roofs from water ingress
  • Use on flat and pitched roofs and around existing pipe work and extrusions


  • Ideal for safer maintenance work or emergency access in all weather conditions flexible seal
  • Extremely flexible to withstand the natural expansion and contraction of the roof structure
  • Tough aluminium oxide grit for a hard-wearing, coarse slip resistant surface
  • No compromise to the sealing properties of the membrane
  • Ideal for roofs where water tends to pool or where algae grows


Suitable for Concrete, asphalt or similar type roofing membranes
Finish Light grey, anti slip (smooth also available), semi-gloss finish.
Interior or Exterior Exterior
Primer required No
Composition Single pack, water based, fibre loaded pigmented detail coating based on an elastomeric/self-crosslinking acrylic polymer system
Number of components 1 x Liquid Roof Membrane, 1 x additive
Coverage 5 - 7 m² per 5 litre unit and 14 - 21 m² per 15 litre unit depending on substrate. Typical thickness ~0.9mm per coat. Two coats are recommended
Recommended number of coats 2
Application tools Medium pile roller. Cut in using a brush
Curing time (at 20°C) 8 hours
Minimum application temperature 10°C
Storage Between 15°C - 25°C for at least 8 hours prior to use. Do not allow to freeze
Shelf life 12 months in unopened container
Principle limitations Do not apply to wet/icy surfaces or if surface/air temperatures are below 8°C, or in saturated air conditions. Do not apply if RH is above 85%. Do not apply if rain is forecast within 48 hours. Do not apply in cold static conditions. At least two coats of product must be applied at the prescribed coverage rates. The first coat must be fully reinforced with Reinforcing Scrim. This product is not recommended for waterproofing gutters. On solid sheeted pitched roofs, attention to lap joints, bolt heads, etc. will be required.
Cleaning tools It is not practical to clean applicators and they should be disposed of after use


Surface preparation

Inspect the entire surface to ensure the substrate is sound and not weak, loose, flaking or defective. Where necessary, carry out repairs to cracks, holes, blisters, etc. prior to applying Liquid Roof Membrane. Our technical team will be happy to advise you on the best repair material to use for your particular application. Ensure the roof is clean and dry (although slight damp is acceptable) and free from all loose debris and roof contaminants. All fungal growth and moss should be treated with a suitable fungicidal cleaner. General dirt and contamination can be removed with Watco Bio D, a biodegradable solvent free degreaser.


Do not apply if rain is forecast within 48 hours.

The coating should be thoroughly stirred and must not be thinned.

Joints/Protrusions – Apply generous amounts to areas at a higher risk of water ingress such as joints and protrusions, with a paint brush prior to the application of the main coating.

Main Coating – Apply by short/medium pile type roller and work well into the surface. Use a paint brush for the edges. If applying over an existing similar type coating to offer additional protection, one coat is sufficient. Two coats are recommended on previously untreated surfaces simply to ensure that no patches are missed and there is a complete waterproof film. The second coat can be applied after a minimum of 16 hours (based on a temperature of 20°C) and should be applied within 7 days. If more than 7 days elapse the first coat should be lightly abraded before the second coat is applied and the first coat should be checked to ensure it’s clean and free of any debris/moss, etc.

For applications over 1m wide we recommend using Reinforcing Scrim or Fibreglass Reinforcing Tape.

Anti Slip Liquid Roof Membrane – Once the second coat has been applied, simply scatter the grit evenly over the wet coating and leave to dry. Use as much or as little grit to achieve the desired anti slip effect.

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£295.00 (Ex VAT)

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Delivery options
Next day delivery slots available upon request. Call us on 01483 418418 for details.

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Watco Liquid Roof Membrane Anti Slip

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