Limelite Lime Putty


Limelite Lime Putty is made from the finest Buxton quicklime and can be used to make lime mortars, plasters and renders used in restoration and conservation work.


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Overview


Contact:

03444 630 046
limelite@tarmacbp.co.uk

Uses:

Lime putty for building restoration

Limelite Lime Putty is suitable for conservation and restoration of historic buildings that were built with lime mortar.

Lime putty for low strength lime mortar

Limelite Lime Putty can be mixed with a suitable sharp sand to make a lime mortar for repointing brick and stone walls built with lime mortar.

Lime putty for internal plaster and render

Limelite Lime Putty can be used to make a lime render for internal or sheltered external use.


Technical Data Sheet (pdf)

Product Description:

Slow hardening of lime mortars made with lime putty

Lime putty has no hydraulic set and does not set by reaction with water. It slowly hardens by absorbing carbon dioxide from the air. This slow process allows for small movements in the building before it finally sets.

High workability of lime mortars made with lime putty

Lime mortar made with lime putty is a very workable material and when hardened is more ductile than cement-based mortars. This allows the building to continue to accommodate small movements.

Breathability of lime mortars made with lime putty

Lime mortars are also “breathable” and this helps in control of moisture in the building fabric.

Low bond strength of lime mortars made with lime putty

The bond strength of lime mortar is normally weaker than the brick or stone fabric of the building. This avoids the risk of movement in the building causing damage to the building fabric and also makes it easier to eventually recycle the masonry units.

Matching existing lime mortar aesthetic

Lime mortars made using Limelite Lime Putty help to maintain and complement the general colour and aesthetic when renovating or extending historic buildings or constructing new buildings in historic locations or conservation areas.

Flexibility and reduced strength of lime mortars

Lime mortars made using Limelite Lime Putty, are slow to harden and remain more flexible than modern sand-cement mortars, with lower compressive and flexural strength, which helps to accommodate movement such as settlement or thermal expansion without causing stress to other building materials like brick or stone.

Quality assurance

Limelite Lime Putty is made from the finest Buxton quicklime. Matured for a minimum of 4 months it is ideal for the production of lime mortars, plasters and renders in restoration and conservation work.


Mortars


Lime putty will hold up to three times its volume of clean well-graded sand. No further addition of water is required to make a mortar. We recommend 21/2 to 3 parts by volume of sand for mortar production. Through mixing for up to 20 minutes will ensure a workable product is achieved.

For repointing: Remove all mortar to a depth of 1 inch, ensure joints are dampened down, re-mix the mortar to ensure workability. Pozzolans can be added before remixing if using. Pack joints thoroughly, shape whilst it is in the green state. Ensure mortar dries slowly usually over 2 to 3 days. Dampen down if necessary in hot weather to prevent shrinkage.

Pozzolanic additions
Pozzolans such as fly ash or ground blastfurnace slag can be added to give a hydraulic set and increase the strength of lime mortars. Please refer to the supplier’s user guides for addition quantities. Trial mixes should be used on a small test area for suitability before you commence on a large area.


Lime Plaster


Background preparation
Ensure background is clean and dust free. Dampen down the surface to prevent excessive suction. This can be done several times the day before and repeated just before application. Always start at the top of the wall.


Dubbing out
It may be necessary to apply a dubbing out coat to surfaces with large amounts of damaged joints. Always allow this coat to dry out before keying.


Undercoat/Scratch coat
Can be applied 3 -4 days after the dubbing out coat. It can be made from 1 part White Peak lime putty to 2.5 parts grit sand. Before use, hair can be added for extra strength at an addition rate of 0.5kg per 100 litres of plaster. Apply plaster in a layer of 10 -12mm. If a thicker plaster is required apply two costs. Allow for sufficient drying times between coats. Key the surface between coats.


Float coat
Can be applied 4 -5 days after the undercoat. This is made from 1 part White Peak lime putty to 2.5 parts well-graded sand. Hair can be added to the rate of 0.5kg per 100 litres of plaster. This layer should be no thicker than 11mm. Check for shrinkage in the first 2 days and dampen down the surface if necessary.


Finishing coat
Apply unhaired mix 1 part White Peak lime putty to 1 part fine silica sand for a fine internal finish. For an external finish 1 part White Peak lime putty to 2 parts good quality building sand is suitable. Plastering and Rendering on timber laths Wet the laths well the day before plastering and again 2 hours before you start. If dry patches appear dampen them down, unless the laths have been treated with fungicide or insecticide in which case they must be allowed to become surface dry before plastering. It is advisable to add hair to every coat except the finishing coat.

The mortar for the first coat must be stiff enough to hold up when laid but pliable enough to squeeze between the laths.


Storage
On opening the tub it is common for a small amount of liquor to be present on the surface. We recommend this is decanted off before use, and replaced on the surface before resealing tubs containing unused lime putty. Always store under frost-free conditions. Replace the surface water on top of the putty and tightly reseal any part used tubs.

Lime putty improves with age. It can be stored unopened for many years. Well-sealed, part used tubs will also be useable for many years.

Orders


Lime putty is supplied in 16 litre tubs, 33 x 15 litre tubs (approximate weight 700 Kg) palletised and shrink wrapped and delivered in load sizes up to 24 tonnes, or via distributors.


Contact us to order Limelite Lime Putty: