Differences

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--- paintwork [2021/03/28 20:44]
mark [Avoiding creating problems]
+++ paintwork [2021/03/28 21:02] (current)
mark [How to fix]
@@ Line 18: / Line 18: @@
 ===== When to look =====
 ===== How to fix =====
+The optimal choice depends on the type of paintwork being fixed.
+Sample areas of paint should first be removed to determine the most appropriate method for each situation. Directions for applying the stripper and cleaning and neutralising the area afterwards must be carefully followed. This needs listed building consent.
+Where modern masonry paints have already been used, remove any loose or flaking paint by scraping or wire brushing. Any mould or fungus growth must be removed using a proprietary anti-mould treatment according damaging stonework or flooding the inside of the building. Normally a pressure water wash is only allowed up to 200psi; any higher and consent is required. Make sure that the wall has dried out completely before repainting starts.
+=== Paintwork on traditional mortar (Lime harling) ===
+Paint should be replaced by limewash. Limewash and lime-harling are specialised products and although less simple to use than modern masonry paint, give a most attractive appearance. You should get specialised advice before using these materials.
+=== Re-painting For Modern Construction ===
+For Heritage Building built in 20th Century a different approach is needed.
+There are three main types of masonry paint available today.
+a) Water-borne ones use modern acrylic emulsions and are easy to apply by brush, roller or spray.
+b) Solvent-borne ones use a synthetic rubber resin and last well, but release a lot of Volatile Organic Solvents (VOCs) when they dry to the manufacturer’s instructions. e.g. Pliolite ® resin paints VOCs – Volatile Organic Solvents, which contribute to atmospheric pollution. e.g. the Scottish Lime Centre, 01383 872 722 , www.scotlime.org
+c) A group are called ‘silicate’ paints and although not traditionally used in this country, have been used in Europe for over a century with good results.
+=== Paintwork on modern cement ===
+Where possible, modern cement render should be removed and replaced with traditional lime harling. Having done that, use the advice below regarding paintwork on traditional mortar.
+There are several proprietary paint stripping systems available on the market for removing paint from stone such as steam-cleaning, or alternatively a poultice system may be used to remove multiple layers at one application.
+There maybe supplementary planning guidance on such paint removal [// Needs to be written//] .
 ===== Avoiding creating problems =====
+It is difficult to give advice on such a variety of different external surfaces, but the general principle is never to paint dressed stone surfaces and to use traditional materials like limewash to decorate harled surfaces.
+The ingos of doors and windows  (see image) should also not be painted.
 In Georgian properties, paint should never be used on masonry. Wherever existing paint on masonry needs to be renewed it should be replaced by limewash. Limewash allows walls to breathe and protects the underlying masonry.

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