This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.
Moisture Control
Stopgap F77
High-Performance Accelerated Waterproof Surface Membrane One-Coat Application System
STOPGAP F77 is a solvent free two part epoxy resin system which cures to provide a waterproof surface membrane. STOPGAP F77 impedes the passage of residual construction moisture and rising damp from affecting subsequent floorcovering installations, therefore allowing early installation of floorcoverings in fast track building programmes.
STOPGAP F77 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%.
- 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
Coverage:
Applications up to 98% RH – 1.8m²/kg | Applications with underfloor heating up to 90% RH - 1.8m²/kg | Applications up to 85% RH – 2.5m²/kg
-
ISO 9001
-
ISO 14001
-
ISO 45001
-
CE Marking
-
UKCA
Stopgap F77 Overview Data sheets and Downloads
STOPGAP F77 BASE PREPARATION
It is essential that STOPGAP F77 is applied to a clean and absorbent substrate. Any surface contaminants such as surface hardeners, cement laitance etc., should be removed to produce a slightly textured surface. The surface strength of the substrate should be greater than 1.5 N/mm² in accordance with BS 8204-6 Part 7.2. Power floated concrete should be mechanically prepared.
New concrete or sand/cement screeds should be left for a minimum 7 days before surface preparation and application of the membrane. For further guidance please refer to the F. Ball Subfloor Preparation Guide. Rough, uneven or damaged concrete or sand/cement screeds must be smoothed/ repaired with STOPGAP 1200, STOPGAP 1500, STOPGAP GREEN BAG/114 or STOPGAP 460.
Joints between bays where continual movement of the base is not anticipated or small hollows may be filled with STOPGAP F77 mixed with clean dry sand and allowed to fully cure before applying the membrane. Care must be taken to minimise the occurrence of pinholes in the smoothing compound when pre-smoothing.
It is essential that hygrometer readings in accordance with Appendix A of BS 8203 (Installation of resilient floor coverings) and BS 5325 (Installation of textile floor coverings) are taken and recorded prior to commencing the installation. For details on other subfloors, contact our Technical Service Department.
Videos
How to mix and apply Stopgap F77 - High Performance Waterproof Surface Membrane
STOPGAP F77 is a solvent free two part epoxy resin system which cures to provide a waterproof surface membrane.
STOPGAP F77 impedes the passage of residual construction moisture and rising damp from affecting subsequent floorcovering installations, therefore allowing early installation of floorcoverings in fast track building programmes.
Need help?
Should you require further information or advice regarding any F. Ball products, please contact the F. Ball technical service team on +44(0)1538 361633 or by e-mail: technical@f-ball.co.uk For the latest information on adhesive recommendations, please refer to the F. Ball Recommended Adhesives Guide