Restoration Lime Kent

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Scratch Coat


Lime render on a flint wall

This picture illustrates our traditional slaked lime mortar as a scratch coat prior to a slaked lime plaster top coat, painted by the client with a traditional lime wash.

Although in the picture this property may look fairly new is was in fact two hundred and fifty years old and made from lime mortar and flint. Over time cement render and waterproof paint had been applied probably by the same person who fitted the windows. Unfortunately this had created a scenario where a breathable wall built without a damp course had been encased in a non breathable rigid shell.

The building and its new coating reacted differently with the expansions and contractions caused by heat, cold and humidity. Hair line cracks had appeared in the paint and cement allowing moisture in when it rained and from the ground but keeping it locked in. This had caused the paint to start to bubble and the cement render to crumble, a sure sign that there is a damp problem this will also weaken the existing lime mortar .

The internal elevation was reacting the same way, as the moisture levels increased.

Cement render and waterproof paints can rapidly damage a period property. To begin the process of repair we removed the offending outer coating and cleaned back to the flint. As excessive moisture had started to damage the lime mortar we then needed to also remove any loose material.

The flint wall was then wetted and an initial backing coat applied ,never use lime render on a dry wall it will not stick . We then proceeded with a further two backing coats of our traditional slaked lime mortar and plastic angle beads (never us galvanised beads with lime render or indeed outside at all).

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