NATURAL HYDRAULIC LIME


Unilit allows successful application of lime plaster and render over all mineral substrates, and the range of bonding layers will ensure adhesion to substrates varying from dense concrete to friable masonry. Unilit is noted for its success in traditional lath and plaster applications and can be used with or without hair reinforcement. It is particularly successful where patch repair to old lime plaster is required, and will allow the application of a new finish to both the new and existing plaster. For areas below ground level, up to one metre above ground level and any other excessively damp or salt laden areas we recommend the use of Unilit 30 waterproofing and stabilising mortar which maintains the permeability, prevents water liquid passing through the plaster and ensures damp and salts control.


The majority of our mortars are pre-bagged to ensure the suitability of the mix for the specific substrate.


Condensation and Insulation


The open pore structure of lime mortars provides benefits over dense cementitious materials as they do not transmit heat or cold as readily. The flexibility of the mortar ensures that movement caused by thermal gain is significantly reduced. Expansion joints are not required.


The mortar Unilit 20 is a hydraulic lime blended with perlite to provide a natural insulation mortar that will eradicate problems caused by condensation or thermal shock. In improving the insulation value of the building, Unilit 20 regulates the moisture content in the structure, which can occur due to the introduction of heating into older structures. It is particularly suitable for buildings of architectural or historical importance where skill and care in the selection of the techniques for conservation is critical. Unilit 20 can be applied internally to achieve thermal improvement without adverse affect upon the performance or integrity of the original fabric The product is extremely lightweight (4Kg/cm/m2) making it ideal for application in thicknesses from 15-100mm onto weak substrates.


Insulated render recommendations vary greatly from those above for lime built traditional structures where permeability and vapour control are of paramount importance to those for modern day concrete and cement structures which are covered in the new construction section in the following pages.


Damp Eradication and Control of Hydroscopic Salts


Correct investigation to establish the cause of damp is essential with wall thickness, temperature, ventilation and heat transmission all impacting upon the movement of vapour, as well as the ability of the structure to perform as a dry element. Structural defects, impermeable sealers, decorative coatings and dense cementitious renders can all adversely affect the building performance.


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