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Problem Solver - Limewash
Other Problems
Limewash is a traditional breathable finish used to decorate and protect porous stone, brickwork and lime-rendered or lime-plastered surfaces. It works by absorbing into the substrate rather than forming a film, allowing moisture to pass through freely. If applying to lime plaster, continue to use a breathable product throughout the system. If you are re-coating over existing limewash on a non lime plaster, apply a suitable primer sealer before finishing. For full guidance on lime plaster preparation, please refer to our Lime Plaster Problem Solver: https://www.brewers.co.uk/know-how/problem-solver/lime-plaster
Preparation
Dry brush the surface down using a stiff bristle brush to remove any loose materials. Ensure the surface is clean, sound and free from mould, algae or contaminants that may affect adhesion.
If any mould or mildew is apparent, treat with a suitable fungicidal solution, rinse again with clean water and allow to dry.
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Filler
Use a lime-based filler to repair minor cracks, small holes or surface imperfections. Lime-based fillers remain vapour-permeable and flexible, ensuring they move with the substrate and maintain full breathability.
Topcoat
Apply a suitable breathable product that allows moisture to escape through the surface. Lime-based substrates require high vapour permeability to avoid blistering, flaking or damp retention. If the substrate is lime plaster - Use traditional limewash or a breathable mineral paint designed for lime-based surfaces. If re-coating over existing limewash - Apply a breathable primer sealer, such as Zinsser Grade 1, to stabilise the surface and provide an even base. Follow with a compatible breathable finish coat.
Limewash is a very traditional finish, used to decorate and protect porous stone and lime-rendered surfaces.Â
Preparation
Dry brush the surface down using a stiff bristle brush to remove any loose materials
If any mould or mildew is apparent, treat with a suitable fungicidal solution, rinse again with clean water and allow to dry.
If painted, check for cracks or areas of blown render where water could penetrate such as behind downpipes and gutters and make good.
Basecoat
Once the surface is clean and all loose material has been removed, treat with an Alkali Resisting Primer or suitable plaster primer and allow to dry.
Topcoat
For exterior Limewash on lime rendered surface, apply a suitable topcoat
Apply a suitable topcoat
