Lime Putty

Our high calcium lime putty is guaranteed to have been matured for a minimum of four months; our putty will not be beaten on quality.

Key Benefits

  • Produces a superior plaster - Lime Putty yields the best lime plaster bar none.
  • Very easy to use - Creates fatty mortars, renders and plasters.
  • Ideal for old builds - Very vapour open (breathable) mortars.
  • Quality Guaranteed - Matured for a minimum of 4 months,



5% discount on orders over £500 (Excluding Vat & Delivery). For larger projects visit our pricing page.

Product Variations

Product OptionPrice (Ex VAT)
25kg-tubs: £14.77 £17.72 inc VAT
bulk-bag: £359.19 £431.03 inc VAT
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Cornish Lime have been manufacturing Lime Putty since 1994 and we take great pride in the quality having earned a reputation within the industry as one of the leading manufacturers in the UK. Our Lime Putty is made using high calcium quicklime from Buxton, Derbyshire in the traditional method of storing in pits after slaking (adding to water). Our putty is matured for a guaranteed minimum period of four months and will have an approximate bulk density (RBD) of 1350kg/m3. It is important when ordering lime based materials to know the density of the lime putty; putty with a lower density will have a higher water content with less available lime. Therefore, additional lime could need to be added into the mortar.

Lime Putty in mortar, render and plaster: traditionally, the main use for Lime putty would have been in renders and plasters having been allowed to mature for a period of four months to allow all the quicklime in the form of calcium oxide to fully convert to calcium hydroxide. Whereas traditional building mortars were made from quicklime and sand mixed together in a process we today call Hot Mixed Lime this was a simpler process which yielded a lime rich mix ideal for most aspects of masonry, and we believe that if the mason’s or bricklayers were to have taken the putty it would have highly likely resulted in distress of some form at the site.

However, Lime Putty today is used for all aspects of construction, although some are clearly not appropriate for this material as its virtue can sometimes be its downfall, although there is no doubt that it produces the most vapour permeable of lime binders. Cornish Lime as one of the largest producers of Lime Putty in the UK recognise these issues and remain at our customers’ disposal to assist in the selection of the most appropriate materials for your project.


  • Lime Putty yields the best lime plaster bar none.
  • Very easy to use (fatty) mortars, renders and plasters.
  • Very vapour open (breathable) mortars.
  • Cornish Lime Quality 4 Months mature


  • Can be more demanding in terms of its aftercare.
  • Will not work in damp or wet environments. No chemical set, carbonation only.
  • Limited use during the colder months – only use outside when the swallows are home, usually between April and October.

*Please note bulk bags are crated before shipment. For deliveries booked with Palletforce, an additional £30 + VAT shipping fee will be collected via phone before delivery.

Used In Conjunction With

  • Cornish Lime Fine Sand
    Fine Sands
    The best selection of fine and superfine sands, from 2mm down to 0.5mm down, chosen for their gra...
  • Selection of sands
    Coarse Sands
    The best selection of coarse (5mm down) sands, chosen for their grades, colours and mineralogy to...


Suitable for building mortars, renders and plasters. Lime Putty yields the best lime plaster bar none.

The most important thing to consider when working with a Putty based mortar, is how the mortar will cure. Unlike NHL’s, Putty mortars need to be well protected from extreme heat, cold or moisture while they carbonate. Read our guide to Curing Mortars before working with Putty Mortars unless you know what your doing.

Putty when mixed with sand, usually at a mix ratio of 1:3 or 2:5 will make a lime mortar. Browse our range of coarse sands or fine sands for lime mortars, renders and plasters. Hair, Fibres or Pozzolans can be added to the mix to modify certain characteristics of the mortar.

Each project is unique, always seek professional advice before undertaking a project.

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Lime putty is a versatile material used as a binder for building and pointing mortars, renders and plasters. Within these materials, it’s the lime putty that holds everything together. In heritage construction, lime putty takes the place of cement; however, it’s used at different mix ratios.

Lime putty is a blend made from calcium hydroxide and water. Limestone is taken and cooked to form quicklime, with water added to it to form calcium hydroxide in a process known as slaking. Slaking can be done in a way to form a dry powder, or excess water can be added to form a putty. Better quality putties are allowed to mature and thicken over a period of several months. Cornish Lime Mature Lime Putty is matured for a minimum of four months.

Not by itself, it’s likely to shrink and crack. However, mixing it with very fine sand or a powdered stone is often enough to make it suitable for use as a filler, almost like making a very fine mortar. We also have our own Fine Lime Putty Filler as an option to consider.

Lime putty does not set. Setting is a chemical reaction typical of hydraulic materials; lime putty stiffens through suction and loss of water and carbonates slowly over time. The general rule of thumb is that carbonation of lime progresses 1 to 1.5mm per month, occurring faster in warmer and slightly humid weather.

Lime putty should last indefinitely if kept damp and away from fresh air. Typical packaging methods should allow for at least a year, if not more before any significant carbonation occurs.

Lime putty is a type of hydrated lime; in fact, any lime that has been slaked is technically a hydrated lime, including NHLs. There exists some confusion as dry powder bagged CL90 lime, which is used as a plasticizer in Portland Cements, is informally referred to as ‘hydrated lime’; however, there are multiple types of hydrated lime available.

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