Efflorescence is a process that occurs when crystalline deposits of salts within the building material dissolve with the moisture and bubble up to the surface where the water evaporates leaving the powdery deposits intact on the surface. It can be seen where there is presence of humidity within or on brick, concrete, stone, stucco or other building surfaces. The eventual appearance is a whitish or greyish tint to the walls due to salt deposits that remain on the surface after water evaporates.
There are three major types of efflorescence as shown below:
Primary efflorescence which occurs due to moisture captured by the material during the first installation of the structure. For example, it could occur at the application stage when the water used for a cement or mortar mix evaporates. In such cases, the problem may not recur if the surface is cleaned once the evaporation is complete.
Secondary efflorescence occurs when moisture is absorbed into a dry material, long after its installation. This can be seen during water infiltration from behind brick cladding, or water pooling in the ground beside or beneath a building. In these cases, the efflorescence remains until the problem is addressed. This can be rectified using corrective measures through Terraco Efflorescence Solutions.
Another reason efflorescence could occur in dry conditions is when water within a material evaporates before reaching the surface, which means the salt deposits occur underneath the surface. This can degrade the material resulting in scaling or spalling.
Aesthetically, efflorescence looks like a stained surface but could be indicative of excess moisture within the affected building material. This could be due to multitude of reasons and must be examined immediately to avoid any unpleasant surprises, such as unseen structural damage or mould formation.
To avoid these issues, Terraco recommends the below products that would be ideal to rectify efflorescence issues and ensure the structural integrity of the buildings.
Weathercoat GP is a high quality, versatile, permanent waterproofing system for roofs, facades, wet rooms and water retaining structures.
Handycoat Exterior is a ready-mixed skimcoat for levelling exterior masonry and cement fibre board surfaces.
Handycoat ACP is a ready-mixed skimcoat for cold surfaces to minimise condensation problems.
Terramix Standard is a polymer modified, cementitious, masonry repair mortar / plaster ideal for repairs and levelling up to 3 – 5mm thickness.
Terramix Fine is a repair mortar and thin layer plaster for repairs and levelling up to 1 – 3mm thickness.
Flexishield is a mid-sheen elastomeric performance paint for exterior substrates with excellent crack bridging properties.
A fine, low build textured coating applied by roller with a fine even stipple finish.
A low profile textured coating applied by roller with a lightly grained even finish
Terracoat Excel is a trowel applied texture giving an alpine scratch finish. It is available in 3 grain sizes.
Terracoat G is a low build roller applied lightly grained textured coating. Consumption rates are low making it a very economical finish.
A multi-textured coating applied by spray / roller and spatula to achieve various patterns from fine spray to roller stucco.
A fine to medium build textured coating applied by roller / spray with a sand grain finish.
Available in over 1000 colours.
A medium build textured coating applied by roller / spray – the medium build spray finish is most popular.
A high build textured coating applied by roller / spray with a high profile decorative finish.
Terracoat Suede is a medium build decorative textured coating applied by trowel with a suede effect finish. Recommended as a finish for Terraco EIFS.
A trowel applied textured coating with a 1mm and 2mm even granular finish. Recommended as a finish for Terraco EIFS.
A trowel applied textured coating with a 1mm and 2mm filled granular finish. Recommended as a finish for Terraco EIFS.
A filled granular finish using a combination of aggregates tinted to almost any colour, allows Terracoat Granule Filled to create the illusion of texture while not appearing to be porous.