Lime mortar made traditionally from our UK produced lime putty and specially selected sands.
Lime mortar is used for bedding, lime pointing lime plaster and lime render.
Our high quality lime mortars are suitable for various building uses – please speak with our friendly technical sales staff for more information about how best to use lime mortar.
The lime putty we produce for our lime mortar and plaster is made from a refined high calcium quicklime (CaO) which is slaked and left to mature for a minimum of three months.
Lime mortar is supplied as the following mixes:
Unhaired Coarse Mix.
3:1 ratio (sand : lime). Suitable for internal and external building, lime render and lime plaster (scratch/float coat <10 mm), and lime pointing (add a pozzolan for external use)
Haired Coarse Mix.
3:1 ratio (sand : lime). Suitable for internal backing coats of lime render or lime plaster. For the scratch coat onto lath ceilings we also supply an extra haired lime mortar suitable for external backing coats of render (with pozzolan).
Our haired lime mortar is made from premixed mature lime putty and specially selected sands. We use 2 kg of natural animal hair per m3 of mortar as standard but can arrange for goat hair.
Haired lime mortar needs to be used within 2 – 3 weeks as the hair will gradually dissolve with the alkaline lime. The mortar is still usable if you tease fresh hair back into it.
Extra Haired Coarse Mix.
3:1 ratio (sand : lime). Suitable for scratch coat lime plaster onto lath ceilings.
We use 4 kg of natural animal hair per m3 of mortar in our extra haired coarse mix.
Cob Bedding Mortar.
4:1 ratio (sand : lime), suitable for laying cob blocks.
We also offer a range of coloured lime mortar for matching historic lime pointing.
In the past, lime mortar tended to be mixed on site with whatever sand was locally available. Since the sand influences the colour of the lime mortar, colours of pointing mortar can vary dramatically from district to district.
If your lime pointing needs replacing or repair, you will wish to match the existing colour as closely as possible. We carry a range of sands which we use to mix a selection of coloured mortars to help with this process.
This is achieved by mixing lime putty with blends of suitable coloured sands. We can supply sample biscuits for you to match your own mortar or we are happy to give advice if you send us a sample of your mortar in the post.
Of course we will be attempting to match the original colour of the mortar, not the current weathered colour; in due course, as the mortar darkens and weathers, it will more closely match any remaining original mortar.
We do not make a charge for advice on matching the samples. For advice on the use of lime mortar and pozzolans, have a look at our “Repair Guidesheets” and “FAQs”.
Our standard range of lime mortars are fully matured and available for immediate despatch. Specialist coloured mortars are typically used for pointing or bedding stone or brickwork where you need to match an existing or the local type of lime mortar. These mortars are made to order, typically with a 2-3 day lead time and some coloured lime mortars cost more than our standard lime mortar.
1,000 kg of coarse mix lime mortar will:
- re-point approximately 100-150 m² of stonework,
- re-point approximately 50 m² of brickwork,
- render/plaster 50 m2 at 10 mm thick.
1,000 kg of 4/1 lime mortar will:
- lay approximately 150 cob blocks.
Please see below the standards that our raw materials conform to:
Sand: 0-4mm Sand EN12620 or BS882 Lime: BS EN 459-1 : 2001
Soundness test ( totally slaked ) – pass
PATS test ( moisture content/maturity ) – pass 99.99% is finer than 0.18mm particle size
Hair: All of the hair used in our hired lime mortar has been disinfected and has a veterinary (health) certificate.
You will find a wealth of information about how to use our products on our website, and we are very pleased to give advice on the telephone, but if you are looking for additional independent advice, we recommend The Society for the Protection of Ancient Buildings or The Listed Property Owners Club