PPC Multi-stripping vinyl
PPC Planing
PPC Grinding concrete PREPARE FOR SUCCESS
Paul Igo Technical Director at The Preparation Group talks us through mechanically preparing surfaces to receive screeds and resins.
The successful application and durability of screeds, resins and coatings is dependent on a clean, sound background surface. When selecting the correct equipment and methods of preparation to employ, consideration must be made for potential problems such as uneven joints, high spots, contaminants, worn coatings, sticky residues, old tiles and friable substrates. These all need to be tackled to achieve a clean profiled surface to enable the screed or resin to effectively bond and to realise its performance and aesthetic credentials.
The four main methods of preparation are; multi-stripping, planing, grinding and shotblasting with each producing different results.
MULTI-STRIPPING Multi-stripping is used to remove materials such as tile, carpet, vinyl, latex, adhesive, screed and resin deposits. It is usually selected when there are no other effective options available, but cannot be used on inclines, uneven surfaces or in wet conditions.
Blades or picks are attached to the front of the machine and it is their type, weight and position that determines the removal of the designated surface, with the machine cutting or lifting the material as it drives forward.
Having stripped the floor, additional techniques will be specified in order to provide a suitable background surface for application of the screed or resin.
SHOTBLASTING In the correct conditions, shotblasting is one of the most cost effective methods of preparation. It is used to remove paints, sealants and to key existing coatings, resin systems and screeds, ready to receive a new material. It is also used for removing laitance on new power floated concrete.
The process involves steel shot propelled at high velocity onto the background surface to produce the desired profile, determined by its size or grade and the speed at which the machine is propelled.
Surfaces to be shotblasted must be sound and hard and less than 2mm thick. Shotblasting will produce tramlining (minimised with operator experience but not completely eliminated) which won’t be suitable for resin systems less than 1mm in thickness as the undulations will show through. Shotblasting will also highlight surface defects in the background surface and cannot be used on wet surfaces.
PLANING Planing is generally selected to remove materials in excess of 2mm in thickness and where multiple layers of materials are evident Applications include the removal of old screeds, asphalt, latex and adhesives and for reducing levels and tamped surfaces.
The principle is based on a drum fitted with interchangeable flails/picks, rotating at high speed within the body
36 | SCREEDS, RESINS & COATINGS
of the machine and making contact with the surface being treated. There are different shapes and sizes of flails and picks available for specific tasks.
GRINDING When a flat, level and smooth profile is required you would select grinding and also to remove surface contaminants, adhesives, coatings and sealants and to polish resins.
Grinding is achieved by diamond, tungsten or resin-bonded plates or discs which are secured to single or multiple heads and rotate in a circular motion.
The process may be ineffective on uneven/tamped surfaces and in removing sticky compositions if the correct diamond accessories are not selected.
There are various machine sizes and power types on the market however the principle of multi-stripping, shotblasting, grinding and planing remains the same. Sometimes several processes are required to achieve the necessary bond for resin application, for example planing off the existing coating, followed by grinding it flat and then blasting it to re-open the texture. It is important to note that the thinner the system being applied, the finer the surface profile needs to be.
For bespoke training on all aspects of preparing, removing and finishing surfaces, contact
training@ppcgroup.co.uk.
www.thepreparationgroup.com
www.tomorrowscontractfloors.com
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