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Plastering & Rendering

Removal of cement render- advice and recommendations

Anonymous user 09/03/2024 - 2.57 PM

I live in a grade 2 listed building and it has 2 elevations which have been cement rendered in the past. I have attempted to remove the render with a hammer and chisel to try and save the brick face underneath but i am going to have to invest in some motorized tools! I am going to replace the render with a hot lime render to allow the house to breath but i suspect this wont be taking place this year until it all dries out. My questions is, if the house breaths with Lime pointing (which my house has under the cement render) then I don't understand why the cement render was added in the first place? The builders who have come to look at the job all say it is likely because of damp but if the wall was pointed in lime mix, i cant fully understand why it would have damp in the first place? Can anyone help me with their thoughts on this? Thanks. Rebecca

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2 Answers

ADR Property Maintenance

Rating: 5 out of 5

Boston

there are many reasons for dampness in a house, poor brickwork i.e splayed bricks, bad pointing , the wrong materials used hydrated lime with cement rather than hydraulic, or non hydraulic , lime. I have see so many so called experts adding cement to there lime mis which defeats the purpose of using N.H.L. and does not achieve what you want it to do there is no cement in N,H.L. or additives, an the outside temperature must be right, bricks are porous not water proof, now thats just the brickwork, you then have leaks from guttering,roof,chimney, poorly fitted windows, to name but a few without talking to the person who had the rendering done and when they had it done its impossible to tell you why. to re point & render with a n.h.l render does not require the wall to dry out prior to application so really don't know why you have to wait prior to re rendering with N.H.L. render good luck alex

Answered17 June 2018

SA Humphreys

Rating: 5 out of 5

Prescot

ask but not sure if you could re do a grade 2 with k rend, otherwise its lime render which you need a specialist and results vary, i like to use a 1 cement 2 lime 9 sand mix, but this is not a lime render its a mortar mix, i also like a 1 cement 2 grit 3 fine render mix , as this is the strongest workable mix with plasticiser added,

Answered9 March 2019