Natural Lime Mortar

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A premixed general purpose lime mortar for building and pointing stone, brick and block. Available in a range of strengths, colours and textures.

Our dry hydraulic lime mortars can be used for internal or external works and come in many different colours and four textures, perfect for achieving the best possible match with any existing brickwork or a particular building style. 

Our hydraulic lime mortars are available pre-packed in 25kg paper sacks for smaller jobs or can be delivered in 1000kg bulk bags as required. If you are working on a larger project, or a commercial development then we can mix mortars to your specific requirements and arrange silo storage for extra on-site convenience.

Downloads

Four different sand textures are available;

SG - 1mm sand

RG - 2mm sand

CG - 3mm sand

Packing and availability

Available in 25 kg paper bags or sealed one tonne bulk bags.

Consumption

Repointing: 20kg/m² stonework; 7kg/m² brickwork. One tonne of mortar will lay 900-1200 bricks. All figures are approximate.

Guidance on mortar choice

General solid masonry Dense masonry, parapets and lintels use "Medium strength mortar"

Above roofline, below DPC incl. copings and cappings, Earth retaining walls use "Strong strength mortar"

Mixing

Add only 4 to 5 litres of clean water per bag Pour the water in slowly as the product mixes, using just enough to achieve the correct workability. Mix for 3 to 10 min. Lime green mortars may be reworked up to 8hrs. Please contact us for further information.

Application

Before pointing or building clean and remove all dust and loose material from joints and masonry, and adequately dampen dry or high suction surfaces. Do not use in temperatures less than 5 ºC or over 30ºC.

Please note that colours on screen may vary from actual finishes.

Use this colour chart to narrow your choice of finishes then get in contact with us for your your colour samples

Tallow

Bath

Cotswold

Ochre

York

Purbeck

Bracken

Stone

Barley

Corfton

Harnage

Earth

Terracotta

Salmon

Tugford

Farringdon

Birch

Cinders

Chalk

Please note that colours on screen may vary from actual finishes.

Use this colour chart to narrow your choice of finishes then get in contact with us for your your colour samples

Image showing the regeneration of London’s King’s Cross Station- constructed using Lime Green’s Lime Mortar and Roman Stucco Plaster.

Project: King's Cross Station

 

London's King's Cross is undergoing extensive development and regeneration. But as a landmark location, special care must be taken to preserve the area's historic character and nature.

The organisation responsible for doing this is English Heritage. In particular, they are keen to retain the ‘natural' look of King's Cross, meaning that the renovation of existing buildings has to be undertaken sympathetically and in keeping.


The Requirement

So when it came to the repair of brickwork and high-level decorative cornices damaged during the Second World War and left untouched since, they set out a very detailed specification for their reinstatement.


This meant ensuring that, particularly when it came to mortar, the colour should remain consistent throughout, so as not to give a patchwork appearance to hundreds of square metres of wall.

The Problem
However, there were a number of fundamental problems in achieving this:

  • Artificial pigments couldn't be used in the mortar because they were not used originally, so any colour had to come from the materials alone.
  • There was the added difficulty of maintaining consistency of colour, so that the mortar applied on the first day had the same colour and texture as the mortar applied on the last.
  • For health and safety reasons no dust could be created that might affect the public or machinery, so any batching had to be done off-site.


The Solution
Lime Green was asked if it could meet those requirements. After numerous site visits, and much research and experimentation that saw us carefully mixing and remixing the constituent materials, we had a nine-ingredient mortar that was the perfect colour match for the one already in place.
With English Heritage and their architects satisfied, and our Prompt-based Roman stucco plaster also chosen for the cornices, work began.
To ensure consistency of product was maintained throughout the process, the mortar was carefully mixed. Checks were then made on each batch, before being sent to site 10 tonnes at a time.


The Benefits
Besides being of high-quality, our specialist products also had other advantages.

  • The mortar was as easy to use as a cement-based product, so contractors could work more quickly than traditional site batched lime-based mixes - important when they were on a tight time schedule to complete or face stiff penalty clauses.
  • Our Roman stucco sets repidly, therfore the contractors could work more quickly - which meant that the plasterers could build up the cornice to size as they went, using zinc blades to shape and maintain the cornice's still soft profile.
  • And because of both products inherent flexibility, there was no need for unsightly expansion joints in the facade, as there would have been if cement-based plaster had been used.


Our products were the only ones that ticked all the boxes, not just for English Heritage, but also for their teams of advisers and their contractors, who found working with our mortar and plaster quicker, easier and more enjoyable than using standard site mixed mortars and plasters.


And so pleased were English Heritage with our mortar, that having discovered it, they have specified it again for other projects elsewhere.

 

 


 Image showing a plaque from The Bomber Command Memorial, London’s Green Park. Predominantly created using Portland Stone and Lime Mortar - Lime Green

 

Project: The Bomber Command Memorial

Britain's Bomber Command played a significant role in the Allied victory of the Second World War, a contribution not recognised with a national memorial until June 2012. Then, in London's Green Park, the Queen unveiled The Bomber Command Memorial, in commemoration of the 55,573 who gave their lives during the 1939-1945 conflict.

The Requirement

To echo the distinctive white-grey limestone appearance of London's major public buildings such as St Paul's Cathedral, Buckingham Palace and the Cenotaph in Whitehall, Portland Stone was chosen as the predominant material for The Bomber Command Memorial. It is also the same stone that the Armed Forces Memorial at Alrewas in Staffordshire is made from.

Given its historic significance, the memorial has to be robust enough to stand the test of time, and remain in great condition, despite all that a busy London can throw at it.

The Problem

  • Portland Stone is much softer than concrete and modern day bricks, so it requires a high quality lime render that will have not only durability and a good surface finish, but also the flexibility and porosity to ensure that it does not crack or shrink. To have used strong, rigid-setting Portland cement (which has nothing to do with the Isle of Portland where Portland Stone comes from), could have proven potentially disastrous.
  • The lime mortar used would need to be an exceptional colour match to the stone blocks for the monument to have the appearance of a one-piece unit.
  • The lime mortar would also have to meet the demands of structural engineers who required both strength and speed of setting to meet their deadlines.
  • The site where the memorial was being built was both short on space and logistically difficult to service, being right in the heart of London where deliveries at peak times are restricted.
  • Some of the joints in the block were very fine and would need a correspondingly fine lime mortar to look their best.
  • Portland stone columns used in the structure would be difficult to bed down solidly on mortar alone.

The Solution

Given Lime Green's previous expertise and experience working on major developments in London, the mortar consultants on the project stipulated us as the preferred supplier. For The Bomber Command Memorial, we supplied three different products in all:

  • Several hundred tonnes of standard mortar, 'tweaked' to become Bomber Command Mortar Number 1 and used for all brickwork areas.
  • A very specific ashlar mortar, which with its very fine texture could be used in the thin joints of the beautifully carved stone blocks.
  • Grout that was poured into the columns to provide structural strength, rather than trying to keep heavy stone blocks balanced on soft beds of mortar. 

 

 

Image showing positioning of The Bomber Command Memorial columns at London’s Green Park. Materials including Portland Stone and Lime Mortar - Lime Green

  The Benefits

  • By carefully testing and mixing mortars we were able to achieve the exact colour match necessary to ensure there are no tell-tale lines breaking up the blockwork.
  • Since lime is able to accommodate movement, it will flex as required, so there won't be any unsightly cracking of mortar.
  • The quality of our lime mortar means that the memorial will stay looking good over a very long time.
  • Given that delivery was often time-critical, materials were delivered in 25 kg bags or one tonne bulk bags. This meant quick offloading onto a tight site, enabling trades to keep working to meet their tight deadlines.

 

Since being unveiled by the Queen, The Bomber Command Memorial has become a major tourist attraction and a moving experience for many who visit it.

 Image showing The Bomber Command Memorial at London’s Green Park- Predominantly constructed with Portland Stone and Lime Mortar - Lime Green

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