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we’re looking at an 1850’s built sandstone house soon to be for sale and surprised to see that most of the house has been rendered many moons ago. I was always of the understand that rendering or harling on sandstone was a bad idea as the stone could no longer breathe and this locks moisture in.
I’ve been reading about The Hill House, in Helensburgh which has exactly this problem so makes me nervous to consider the property.... are my fears warranted?
One wall has signs of damp, although I didn’t have my meter with me so it may be old,
Of course, if we’re serious a full survey will be completed, but just need to get my head around rendering sandstone, good or bad idea.
Hi, sandstone listed building owner here so have done a fair bit of digging around on the matter in the past few years! In simple terms: Lime render/harling = good, cement = bad. There's a lot more to it than that though, it's also about making sure drip details are there, breathable internal materials are used, etc etc. Drop me an email if you like and I can send you some stuff through you might find useful. If you're really interested in the house the Scottish Lime Centre will give the place an inspection for quite a reasonable cost.