F Ball Stopgap 300 HD Self-smoothing

Product Information

All aspects of subfloor preparation and floorcovering installation should be carried out in accordance with the appropriate British, European or International standard and follow current good working practices. STOPGAP FILL AND PRIME is a two component, flexible cement primer that is flexible with thixotropic properties to allow the filling of joints. STOPGAP FILL AND PRIME should be applied using a steel trowel and spread evenly on to the prepared substrate providing a smooth, uniform surface. The consistency has been designed so that joints in raised access panels are filled. However for application over wide joints it is advisable to mix a unit with reduced liquid content and fill the joints prior to a subsequent coating of STOPGAP FILL AND PRIME mixed to standard consistency. Then apply STOPGAP 700 Superflex or STOPGAP 1200 PRO.

Impedes the passage of construction moisture and rising damp up to 98% RH with a single coat application It must be appreciated that these recommendations are general. Modifications may be required according to the floor system used and the service conditions under which the surface has to adequately perform. If there is any doubt seek further advice from our Technical Service Department before proceeding with the application of our products.

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In all cases chipboard and plywood must be primed with dilute STOPGAP P131 PRIMER as recommended. Sterling Board OSB (Oriented Strand Board) must be flooring grade appropriate for the construction of the floor, nature of the building and the expected design loading should conform to BS EN 300, Type OSB/2, Type OSB/3 or Type OSB/4.

The sheets should be fixed using screws in a line 12mm in from the sheet edge at 100mm centres and at 150mm intervals at intermediate centres across the sheets and all joints should be staggered. Membranes such as STOPGAP F76, F77 or F78 can be overcoated with smoothing underlayments or certain adhesives. When applying a smoothing underlayment onto a waterproof surface membrane, the surface should be primed with neat STOPGAP P131 PRIMER and allowed to dry before proceeding with the underlayment. The exception is STOPGAP F78 where the smoothing underlayment must be applied direct (within 12 hours of application) without priming. The medium for shotblasting equipment is steel abrasive “Shot”. The most common grades are 390, 460 and 550.

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Grinding an uneven surface will skim across the high profile and not touch the lower ones unless the surface is reduced to the lowest point of the surface being prepared. The measurement of construction moisture can also be undertaken using the carbide bomb method. Readings of less than 2.5% for all cement based subfloors and less than 0.5% for Calcium Sulphate subfloors must be obtained.

DESCRIPTION StopgapF77High-Performance Accelerated Waterproof Surface Membrane One-Coat Application System Shotblasting will produce a lining effect commonly known as tramlining. This can be minimised with operator experience, but will be visible when applying sealers or thin coatings. Shotblasting will highlight surface defects in the surface being prepared, this is particularly important when applying to old concrete.P131 PRIMER, allowed to dry and then the application of the appropriate STOPGAP smoothing underlayment. Please refer to Technical Service for product selection. Note: 1. Most power floated slabs will be treated with a curing agent. In most cases this will be acrylic based, however, wax based curing agents or certain silicate based products may be present that will inhibit the bond to these surfaces and should All these products are designed to generally repel water from entering into the concrete or screed or to form a barrier to prevent moisture escaping and adhesion will be impaired if a water based smoothing underlayment, adhesive or waterproof surface membrane is applied. Please refer to the data sheets or F. Ball Technical Service Department for further information on these products.