Roundtower Natural Hydraulic Limes

Roundtower Natural Hydraulic Limes are natural products. They contain no additives and are not blended. Roundtower Natural Hydraulic Limes are suitable for building restoration and conservation. Equally, they are very suitable for new construction and engineering works. Roundtower Natural Hydraulic Limes are recommended for mortars, plasters, concrete and grouts. There are three grades of Roundtower Natural Hydraulic Lime: NHL2, NHL3.5 and NHL5.

There are many reasons for using Roundtower Natural Hydraulic Limes:

· Natural colours suitable for both conservation and new build. Excellent sand colour reproduction.

· Compatibility & Suitability – variety of strengths and colours available to suit existing mortar, whatever age.

· Suitable compressive strength – range allows for choice of compressive strengths. Compressive strength is achieved gradually, allowing for movement.

· Stability. Some limes are prone to cracking in the medium term (3months-2 years) as carbonation continues to take place. Roundtower has an even distribution of free lime that allows for stable continuous build up of strength with no stresses and associated cracking.

· Low alumina content - less susceptible to attack by salts.

· Resistance to salts – no gypsum or cement make sulphate attack and
alkali-silica reactions impossible. Excellent performance even in marine environment.

· Purity – No addition of any kind.

· No need for blending – no need for pozzolans, cement, plasticizers, water retainers, waterproofers etc.

· Good workability – Free-lime content gives excellent workability

· Self-healing properties – Free-lime content also gives the mortar self-healing properties.

· Versatility of use – rendering, plastering, pointing, grouts and other building mortars

· Reworking – all Roundtower Natural Hydraulic limes can be re-worked within 24 hours.

· Economy – low bulk density means good economy as sold by weight but used by volume.

· Elasticity – no expansion joints, minimal shrinkage and cracking.
· Permeability – condensation dispersion, reduces rot, healthy living environment.

· Resistance to weather – quick setting means less need for protection from adverse weather conditions compared to Fat lime mortars.

· Resistance to bacteria & vegetable growth – alkalinity of lime inhibits growth.

· Insulation – permeability reduces moisture in structure.

· Recycling – building materials used with Roundtower Natural Hydraulic Limes can be recovered and re-used.

· CO2 Absorption – Natural Hydraulic Lime re-absorbs CO2 during carbonation of the free lime.

· Variety of international reference projects.

· First class quality technical back-up service.

Roundtower General Information
Roundtower Technical Information