Brick Wall

NHL

Natural Hydraulic Lime

Concrete Bucket & Trowel

Rendering |  Pointing Joints |  Finishing Coat

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Rendering

Cover your Façade and walls in natural breathable lime render. 

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Pointing Joints

Touch up your joints on your natural stone or brick façade to keep your building looking sharp and fresh. 

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Finishing Coat

Apply a finishing skim coat your render to enhance your surfaces details and leave a smooth texture for painting.  

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Our Natural Hydraulic Lime products can be used for an array of building applications including, rendering walls, pointing brick/stone joints and finishing or skim coats. Lime is the original building material when it came to constructing buildings before the portland cement was invented in 1824. So, if you’ve got a masonry building built before the 1930s there is a good a chance you’ve got lime mortar rather than portland cement mortar, and if it was built before the 1880’s then it’s almost certain to be lime. Knowing what building material your home or building was constructed with is very important when it comes to renovating or repairing the existing building. These two building materials operate differently when considering the overall performance of your home or building. 

The key differences between the two are:

  • Chemical Composition

  • Physical Properties

  • Vapour Barrier

  • Environmental Concerns 

 

Chemical Properties

Lime is produced from natural limestone and in the manufacturing process it becomes quicklime (calcium oxide). The quicklime is then mixed with small amounts of water to create hydrated lime, which may be included in cement or mixed with water for use as mortar. Cement consists of highly reactive silica-containing compounds. 

Physical Properties

Lime will harden a lot slower than a cement making it a much more workable when trying to render a wall for example. Lime is less brittle and less prone to cracking any cracked areas can absorb carbon dioxide and mend over time. Cement will harden very quickly and this will make it difficult to work with large quantities unless you are casting. Cement can also be too strong for some applications like working with old bricks. Cement is also prone to cracking and usually will require repair to be done once it has settled. Lime is not as hard as cement, it has a lot more flexibility which will allow any necessary movement the building require when settling.

Vapour Barrier

Lime is also breathable, allowing vapours to pass through, which can reduce moisture and improve the environment of the home. Cement creates a waterproof barrier that does not allow vapors to escape, and can absorb water, causing moisture to accumulate -- especially in basements.

Environmental Concerns 

Lime production results in release of carbon dioxide into the atmosphere, but lime mortar absorbs carbon dioxide from the atmosphere over its lifetime. As a result, lime mortar is considered by environmentalists to be "carbon neutral." In contrast, cement production contributes greatly to global warming, as copious amounts of carbon dioxide are released during its production.

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Natural Stone Pointing

Lime is the perfect solution to repair the joints of a natural stone façade. 

The elasticity of the lime will stop any pressure being put on the stone as the lime hardens. 

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SECIL
NHL 2 

Secil 2 can be used for internal plastering 

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SECIL
CAL RJ

A general purpose breathable lime mortar for building or pointing stone, brick and block.  Ideal for conservation, restoration and newbuild. 

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SECIL 
CAL AC FINO

Secil Cal AC Fino is a fine finishing plaster with smooth finish

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RoundTower 
NHL 3,5 WHITE

Reveal panel in the iQ-Therm system

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Setting Stuff

Final skim coat for lime plaster.

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SECIL 
NHL 3,5

Secil NHL 3,5 is ideally suited for bedding and pointing mortars.

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SECIL 
CAL RB

Reabilita Cal RB is used for the conservation of old buildings and is also suitable for application onto substrates such as concrete, bricks or stone. etc.

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SECIL ecoCORK

Remmers iQ-Tex is used to take up movement in the substrate and is used for reinforcing areas of interior insulation.

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PROMPT Natural Cement

Used to gauge traditional lime mortars and plasters, as well in situations that require rapid setting or exceptionally high compressive strengths

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SECIL 
NHL 5

Secil NHL 5 is normally used for flooring such as limecrete floors or in highly exposed locations such as chimney flaunching etc.

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SECIL 
CAL AC

Secil Cal AC is a finishing plaster

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RoundTower 
NHL 3,5 GREY

Wedge-shaped interior insulation panel in the iQ-Therm system

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Lime Putty

Used mainly on historic buildings, soft masonry and where exact mortar matches are important

Our Products

Secil Natural Hydraulic Lime (NHL) features the same properties it used to have, decades ago, before the introduction of Portland cement. It is an exclusive result of the chemical composition of its natural raw materials. Roundtower Limes has been used in thousands of jobs from Derry City Walls to Mizen Lighthouse. Manufactured by Secil, the largest producer of Naturally Hydraulic Lime in France, this range of limes gives first-class results, full breathability and vapour permeability, great flexibility, minimal shrinkage and, most importantly, stability over time.

When it comes to choosing a hydraulic lime, we have a choice of the traditional lime products from two different regions (Portugal and France).

 

Our Portuguese Lime is manufactured by a company called Secil and we stock 3 variants: (NHL 2 | NHL 3.5 | NHL 5). When mixed with sand it will tend produce a colour similar to the sand being used or a creamy brown colour.

Our French Lime is manufactured by Roundtower and we stock one variant in two different colours; NHL 3.5 Grey | NHL 3.5 White. As described, this lime will produce a bright white and a grey coloured lime mixture. 

Earthborn is a range of eco paints and natural varnishes designed to provide a healthier and environmentally friendly alternative to conventional paints and varnishes. Goa 5L White and Just White 5L All standard colour and Delemere Range 5L All other colours including extended range, Eco Chic range and Colour-match colours 100m1 Claypaint sample pots all colours 1L Colour match sample 

 
 
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