F Ball Styccobond F77 Waterproof Surface Membrane

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STOPGAP F77 is a solvent free two part epoxy resin system which cures to provide a waterproof surface membrane.

F77 impedes the passage of residual construction moisture and rising damp from affecting subsequent floor covering installations, allowing early installation of floor coverings in fast track building programmes. It is pigmented black to allow the user to visually control coverage uniformity.

It can be used to isolate residual construction moisture where relative humidity values are up to 98% and applied directly over underfloor heating screed with RH readings up to 90%. When the membrane has fully cured apply a coat of Stopgap P131 Primer.


• Impedes the passage of construction moisture and rising damp up to 98% RH with a single coat application

• Colour pigmented to aid coverage uniformity

• Can be applied direct over underfloor heating screeds using a coverage of 1.8m²/kg where readings are up to 90% RH

• Suitable for use over Stopgap 1200, Stopgap Green Bag/114 or Stopgap 460

• Approximate cure time of 3 hours at an ambient temperature of 20°C

• 7kg kit = 12.5m² coverage, 14kg kit = 25m² coverage (approx.)

> Full Data Sheet PDF


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How delivery is arranged.

  • Once you've placed your order our helpful team will be in contact with your delivery date. This can be changed if inconvenient.
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  • Deliveries are kerbside, made on weekdays between 8am-6pm and will require someone to receive, check and sign for the goods. 


We give you a full 14 days to return unwanted or excess goods (terms, charges and limitations apply) and 30 days for any faulty items. Please contact our customer service team who can guide and help you with the process. 
Take a look at our useful guide to returns for extra information. Read our full terms of service.

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