David Halliday

Thu 29 May 2014 08:24pm

Robbie, You should most definately use lime mortar. You will need an N.h.l 3.5 lime mortar. The mortar ratio should 5: 2 that's two lime which is the binder and five sand which is the aggregate. Do not put cement anywhere near a lime mortar building as this just traps moisture behind the building fabric and causes various problems! Dave

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john cunningham

Thu 29 May 2014 05:46pm

It can be, cement mortar looks different to the original lime mortar. Get some lime and sand and experiment to get the colour right. It wouldn't hurt to add a little cement to help it cure quicker. First try a 6-1-1 mix. That's six sand one lime one cement. Mix a small quantity, say 3 cups of sand, half a cup of lime and half a cup of cement. Mix it slowly adding a little water at a time till it's smooth and is the consistency of thick clotted Cornish cream. Wett the surface well and try it.do a small patch and let it dry( 24 hrs) then compare the colour and adjust the lime content till you have it right. Good luck JC

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