F Ball Stopgap 300 HD Self-smoothing

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Prior to coating or topping, concrete or screeds must first be: free of all contamination and laitance; strong enough to support the coating or topping under the conditions for which the floor is designed. Moisture levels must also be below 75% RH , 2.5% total moisture by gravametric, carbide bomb or speed test methods (less than 65% RH for wood floors) before proceeding with the installation. Power floated concrete slabs, especially those treated with curing agents, will take a considerable amount of time to dry, waterproof surface membranes such as STOPGA P F76, F77 or F78 should be used providing the surface has been shot blasted. Residues or spillages of other trades such as plaster, paint, cement, oil (and sometimes roofing tar) are frequently present in new constructions and should be removed. Plaster and cement can be chipped up and wire brushed. Paint should be mechanically removed. Note: Certain vinyl tiles were made using asbestos, and professional advice should be taken before proceeding to remove these types of tile and their adhesives. Generally with older buildings, these types of tiles were often laid on floors that did not contain a DPM. The substrate should be prepared by mechanical means such as contained shot blasting. If a waterproofing admixture is known to have been used, further testing should be carried out with the proposed system to ensure complete compatibility and adhesion to the host substrate.

The company keeps abreast of market developments by continually monitoring the needs of installers, distributors and specifiers and by maintaining on-going and close liaison with floorcovering manufacturers. Plywood must always be overlaid with STOPGAP 700 Superflex prior to the installation of a resilient floorcovering. Some textile floorcovering can be directly applied to chipboard. P131 PRIMER, allowed to dry and then the application of the appropriate STOPGAP smoothing underlayment. Please refer to Technical Service for product selection.

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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. Wood mosaic panels require over pinning with flooring grade plywood in all cases. This is not practical on solid floors and panels should therefore be removed, along with any adhesive residues. Grinding would be selected for smoothing concrete, removal of coatings, adhesives, levelling compounds and contaminants. Grinding machines are also used to polish a variety of surface finishes. Ceramic, terrazzo and quarry tiles are unaffected by moisture but dependant on their water absorption may be sufficiently permeable to allow the passage of moisture vapour and are often laid in areas which do not incorporate a damp proof membrane. Where this is the case, these bases should be covered with a layer of flooring grade asphalt complying with BS 8204. Alternatively, the use of a STOPGAP F77 Waterproof Surface Membrane can be applied, providing the substrate has been sufficiently prepared by mechanical means and the grout lines lightly raked to remove any contaminants. In both cases this should be followed by priming with neat STOPGAP P131 PRIMER and allowed to dry before applying a minimum 3mm of the appropriate STOPGAP floor smoothing underlayment. If either method is not possible, lift the tiles and relay the floor. STOPGAP ISOLATOR Membrane may also be used in certain situations. 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

Most floorcoverings such as flexible vinyl, linoleum, rubber and textile floorcoverings must be removed and the substrate thoroughly prepared before fully bonded floorcoverings can be laid. Whilst there is a risk involved, some thermoplastic tiles can be overlaid with STOPGAP 1200 PRO or certain floorcoverings providing the tiles are firmly bonded to the subfloor and all traces of polish or any other contaminant which would prevent good adhesion are removed e.g. with STYCCOCLEAN C140 Floor Cleaner. If this cannot be achieved then the tiles must be removed, and the substrate suitably prepared. With some carpet tiles it is, however, possible to install direct to existing resilient and smooth floorcoverings with STYCCOBOND F41 adhesive providing there are no surface treatments that will prevent adhesion. Oil, fats and grease cannot be removed by washing. If such contaminants have penetrated into the surface (which is usually the case) the only way of removing them is mechanically. This means dust-free shot blasting, scarifying, scabbling or hot compressed air blasting. Remedial work in meat processing and engineering plants, for example, remains a very difficult problem. Removing the contaminated concrete and re-screeding may be the only solution. Before the final treatment to bring a subfloor up to the standard required for the application of floorcoverings to begin, the condition of the base must be investigated and any necessary treatments or repairs carried out. Failure to do this increases the potential for premature failure, which is counter productive and expensive to rectify. 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. 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.The asphalt should be flooring grade, comply with the requirements of BS 8204 part 5 and be the correct grade for its service condition. Providing the flooring grade asphalt is in good condition, sound, strong has not suffered rutting or any sign of softening and is free from any form of contamination, the surface should be cleaned with STYCCOCLEAN C140, rinsed with clean water and allowed to dry. The surface should then be primed with neat STOPGAP P131 PRIMER and allowed to dry followed by the application of 3mm of the appropriate STOPGAP floor smoothing underlayment. STOPGAP 1200 PRO can be applied direct without the need to prime.

However, in the majority of cases identifying the type of paint or coating will be difficult and it is most likely it will be brittle, worn, peeling or flaking off the substrate and is therefore not good enough to receive either a smoothing underlayment or adhesive. The easiest method of removing old paint is usually dust-free shot blasting. The finished profile is dependent on the size of the machine and the type and size of the flail selected by the operator. Impedes the passage of construction moisture and rising damp up to 98% RH with a single coat application A surface tensile pull-off strength of at least 1.5 N/mm 2 or in-situ crushing resistance test, with a maximum depth of indentation of 3mm, in accordance with BS 8204, is required onto a prepared subfloor before the application of floor smoothing underlayments and serves as a good guide as to the integrity of the floor. Typical applications are: removal of vinyl, rubber, carpets, fully bonded wood flooring, ceramic, stone and terrazzo tiles. Multistripping can also be used to remove levelling compounds, adhesives, thermoplastic markings and scrape surface contaminants.

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Grinding machines are designed for precision, control and safe operation. The process is provided by diamond, tungsten or resin bonded grinding plates fitted to either single or multiheaded machines which rotate. 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. DESCRIPTION StopgapF77High-Performance Accelerated Waterproof Surface Membrane One-Coat Application System

that are not water soluble. However, for all other smoothing compounds at least 75% of the floor area should be exposed, Worn or uneven floorboards should either be replaced or levelled by sanding, planing or by patch filling with STOPGAP GREEN BAG/114 Liquid or STOPGAP 1200 PRO floor smoothing underlayment before finally covering with plywood conforming to BE EN 636 Class 2 (Suitable for use in humid conditions) and should be constructed with hardwood veneer and EN314-2 Class 3 (exterior) for the glue bond. Cores may be taken to determine the depth of penetration and can assist in deciding on whether or not it is possible to prepare a surface for overlaying. It may be necessary to carry out adhesion tests to ensure adequate adhesion is obtained on a contaminated surface.

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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. 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.