Renovating Plaster 25kg

Details

Preparation
All surfaces should be thoroughly cleaned to remove dust and other friable material and masonry joints raked out. Remove all traces of previous gypsum plaster coatings and remove all organic matter (including timber fixings) prepare all fixing points which require cutting out. Thoroughly wet or prime with SBR Bonding Additive all areas that have high suction. Apply a coat of SBR Bonding Additive or hack off to provide a mechanical key to all smooth dense surfaces. Surfaces with high levels of salt contamination may require further preparation which may include treatment with Permagard Salt Neutraliser.

Mixing
Do not exceed a mixing time of more than five minutes when mixing by machine. When mixing by hand add half the contents of the bag to approximately 12-14 litres of water and mix. Then add the remainder of the bag and mix (add more water if required) to obtain the correct consistency. Renovating Plaster will be easier to use if it is allowed to stand for a few minutes before it is applied to the wall.

Application
Renovating Plaster should be applied in one coat between 10-15mm thick. Additional coats can be applied if a greater thickness is required. Between coats and before the application of a finishing coat the surface should be combed or lightly scratched to provide a mechanical key.

Finishing The backing coat should be allowed to set and dry for a minimum of 24 hours, preferably longer, particularly under adverse curing conditions. Thistle board, multi finishes or limelite finishing are all suitable finishes and these should be applied at 2-3mm thickness. A high quality wood float can be used when the scratch coat is to be left as the finish.

Effect of Moisture
Not impervious to water vapour, but will resist the passage of soluble salts. The special constituents including lime in Renovating Plaster ensure an alkalinity which inhibits mould growth. The insertion of a DPC only controls further ingress of water ie. rising damp. The walls above the DPC level remain wet and need time to dry out. This drying out time is governed by the initial moisture content and the wall thickness. BRE Digest 163 gives a general rate of 1 months drying out time for every 25mm of wall thickness. The first decorations following treatment should be regarded as temporary and the recommended decoration at this stage is to use a trade matt emulsion paint. Final decoration should not take place for at least 12 months following DPC treatment.

Durability
Providing the installation of the damp-proof course and application of the plaster has been carried out correctly, Renovating Plaster should remain effective as long as the damp-proof course or system itself. Compatibility Renovating Plaster is compatible with most building materials. The waterproofing additive and lime content in Renovating Plaster minimises efflorescence and the rusting of metal lathing and conduits, as well as at the same time controlling pattern staining and mould growth. Renovating plaster is not recommended for use over plasterboard, similar paper faced building boards or backgrounds having a bituminous coating or traces of gypsum.

Applications
Renovating Plaster can be used for plastering most traditional background materials during renovation work and also following the installation of a new damp-proof course or system.

Fire Resistance
Renovating Plaster is non-combustible as defined in BS 476 : Part 4, and can be designated Class O in accordance with the requirements of the National Building Regulations for use as a surface finishing mal Conductivity 0.13 0.21

Product Data
Packaging: 25 kilo sacks
Shelf Life: a minimum of 3 months and up to 6 months when properly stored, store in cool dry areas clear of the ground, sheeted or under cover.
Coverage: 3-4m² per 25 kilo bag at the thickness of 10mm
Appearance: light grey cementitious powder

Health & Safety
No hazard under normal conditions of use.
Irritant – handle as cement
C.O.S.H.H Regulations should be adhered to where applicable.
FOR USE BY PROFESSIONAL OPERATORS ONLY