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Stonemasonry

Should I use acrylic roof coating on a sloping bay window roof made of stone?

Anonymous user 09/03/2024 - 2.40 PM

We’re stripping back the paintwork on the stonework of our Victorian house. The bay window has a sloping stone roof - we’ve exposed some cracks and filled them with external filler, and used a cement mix to secure a piece of stone along the edge that detached – but how should we seal it? We’re planning a mist coat and two coats of masonry paint elsewhere(e.g. cills, mullions etc) – is that sufficient for the sloping stone roof? We’ve looked at the likes of Evercryl or Acropryl, but if we put that on it will we just be trapping moisture inside the roof that will eventually lead to damp? We’re not experiencing any leaks or damp inside at the moment… any advice gratefully received!

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1 Answer

Anonymous user

Natural stone "breathes" and by coating it with paint yes it seals moisture in. Clean the stone as best you can using wire brushes, non phosphorus bronze are best but are difficult to get so standard steel will do. Wash the stone down and allow to dry. Once dry apply coats of a liquid silicon sealant, for this i would reccomend a product called "ctf 40". This will soak into the stone and form a waterproof layer but still allow the stone to breath and dry naturally. The fact you have no damp or water damage internally shows that the roofing structure is still sound so no need to go over board. Mix a little mortar up ratio 6 sand 1 cement 1 hydrated lime and point any obvious gaps or holes. Once it has all dried there should be no need to paint and maintain. Hope this helps.

Answered14 July 2016