External Cement Wall Render – Common Problems
Smooth external cement renders are composed of basic sand, water and cement in precise proportions. Too much cement and it becomes very brittle and not able to deal with thermal expansion and contraction or too much sand can lead to it holding water against the wall whilst too much water leads to slumping and poor adhesion.
Due to these potential weaknesses it is recommended that such coverings should only be applied at a temperature of 5°C or above and should only be carried out during dry conditions and not in direct sunlight. Whenever you see lots of tiny hairline cracks like crazy paving it is because the rendering was put on when the weather was too hot and the water has evaporated too quickly.
Redecoration of cement renders needs to be carried out approximately every 2 – 3 years. Without regular maintenance moisture will penetrate and it is possible for 1 M² to hold up to 2 gallons of water.
When moisture has penetrated freezing occurs causing loss of adhesion to the wall and eventually causing large sections to fall away. Repairs are very noticeable with this method of covering.
Once penetration has occurred water vapour in the home cannot easily escape through the walls , the temperature drops and you now have the ideal conditions for black spot mould and condensation.
Wethertex Exterior Rendering – why is it superior ?
Unlike traditional exterior wall renders Wethertex’s external rendering is made up of technologically advanced materials that result in an exterior finish that will bond to virtually any substrate in most weather conditions and is specifically designed to be flexible and breathable but also be incredibly strong.
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