Dryzone | Waterproofer Additive
Renderguard Gold is a high specification plaster additive that forms an integral part of the Dryzone Damp-Proofing System.
Renderguard Gold is part of the Safeguard Europe Re-Plastering Specification which is supported by BBA Certification Certificate No: 97/3363.
Available in 4 Litre and 25 Litre Containers, Concentrated Solution.
Read our Guide on 'How To Identify & Treat Rising Dampness On Walls'
Often after a Chemical Damp Proof Course (DPC), efflorescent salts are left behind in the wall which are harmful to the plaster finish, leaving the appearance of damp patches.
A suitable re-plastering specification must therefore be used, including a salt inhibiting and waterproofing product such as Renderguard Gold.
Instills salt retardant and waterproofing properties
Reduces water demand
Remains vapour permeable
Timber skirtings, architraves etc., should be removed as outlined in the survey report/specification.
Remove plaster back to masonry to the height specified in the survey report/specification. This height should be no less than 1 metre, or 500mm above the maximum level of visual rising dampness and/or salt contaminated plaster.
Rake out all mortar joints to a depth of 15 mm. This is important in order to help resist the natural shrinkage of new cement renders.
Remove any timber fixing grounds that are present in the masonry.
To create the gauging solution, mix 1 part Renderguard Gold with 24 parts water.
All water should be fresh, clean and free from oil or other organic contaminants.
Prepare 3 parts sand and 1 part cement using the dilute Renderguard Gold solution prepared above. The sand should be specified as washed, sharp sand, loam free which satisfies British Standard BS882:1992 “M” Grading.
Use the minimum Renderguard Gold gauging solution to ensure a dense coat. As a guide, no more than 8 litres should be used for every 50kg of dry mix. Compact the resulting mix well into raked out joints, and render to give an overall thickness of 12mm. Do not over-trowel. When the cement achieves a first set, then scratch to form a key.
The mix is as for the first coat except that water is used instead of Renderguard Gold solution. This is applied as a further 12mm coat, giving a total thickness of 24mm for both coats.
This coat should be applied before the first coat has finally set in order to obtain a satisfactory adhesion between the two coats. Scratch the surface to form a key. Do not over-trowel.
This should consist of a 3mm layer of gypsum skim finish or similar finish. Other finishes are acceptable provided that they are porous. Do not polish.
No decoration should take place for at least 6 weeks after treatment (or until the wall has dried out).
After this time we recommend the use of an Emulsion Paint with a Fungicidal Paint Additive (See our MCS3 Paint Additive). We do not recommend the use of wall paper or high build paints such as enamels.
1 litre of concentrate is sufficient for 7m² of render at 12mm thickness.
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