Sand stone repointing

Posted by wim van lynden, on Wed 05 Feb 2014 03:47pm

Some of the sand stone walls appear to be getting saturated after a long period of heavy rain. The pointing in places probably need redoing, what materials should be used, and in what proportion

Peter Ruddick

Wed 05 Feb 2014 08:23pm

Hello Assuming it is an 'old' stone wall , then it would have been constructed with a flexible lime mortar originally, and as it probably has no foundations , a Hydraulic Lime Mortar would be appropriate. This is porous and lets the water that the wall absorbs evaporate .Cement mortars are nonporous , brittle and cause erosion of the stone . The Mix would be 1-3 or 1-2.5 , sand / lime NHL3 , [ 2 sharp -- 1 soft sand ] Mix it 1/2 a day before use , wet the wall well and wear gloves [ its strong ] If it's a modern wall on a found , then a cement / hydrated lime mortar mix would work say 1-1 - 6 [ cement, hydrated lime, sand ] Note the two different types of lime ! Hope this helps . Regards Peter R . Beamish Const. Services

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Rafal Kaczynski

Mon 17 Feb 2014 08:58am

Hi Wim Everyone has knowledge to respond to a question but every trade person can do a job in different way. We always recomend to post a job on main website because some of a job needs to be seen bedore any advice is given. Our service is free of charge with no obligation quote and our tradesmans are happy to help with every aspects of jobs. I would strongly recomend to post a job on Rated People home page then 3 companies will get in touch then you would be able to choose the right person as you would receive an e mail with a link to tradesman account where you would see a pictures and you will read revious from previous customers. I hope this will help Best regards Rafal

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