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Damp Proofing Renders

Renders have practical uses and are not just designed to make a property look more attractive. Many renders are not designed to be used on parts of a building where there is a damp course, but may be used in older properties. Older buildings may not have a damp proofing course because they have thick walls, a masonry core and brick or stone exteriors. Walls of older houses were designed to absorb water from rising damp. Inevitably things sometimes go wrong and damp proofing renders are called for. If the outer walls have a render of sand and cement then this needs removing. The original render is replaced with a lime and aggregate mortar or just lime as damp proofing renders.

Using the Right Paint

When applying damp proofing renders it is advisable to use lime based paints because these are breathable while modern masonry paint sets up a barrier and prevents the walls from getting rid of water and water vapours. For more modern properties there are now specially designed rendering materials that will protect your home from the problems caused by damp for many years.

Interior Walls

Damp proofing renders for interior walls means removing any bitumen and replacing it with a lime render and paint that is breathable. Damp proofing renders may not have an immediate effect on walls that have been damp for years because it can take between six and twelve months for the walls underneath the damp proofing render to dry out. Lime renders should be applied by a qualified professional if you want them to work because the knowledge of working with lime is passed down from one generation to another. In more modern homes where a damp proof course exists it should not be rendered over as it can cause rising damp and could invalidate the certificate you had with your damp course. If you are going to have exterior walls rendered and there is a damp proof course then you should use a bell cast about a couple of inches above the damp course and render over that, which means the damp course will still be able to work.


Some heavy duty coverings protect your exterior walls from moisture and act as damp proofing renders. Once a wall is coated in a particular product the wall is then sealed against penetrating damp. Damp brickwork and crumbling walls can be offset by damp proofing renders that will enhance the look of your home while protecting it from damp and making it more weatherproof. A waterproofing textured render can protect your home from damp for up to twenty years. If your house has a cellar then there are cellar renderings that can protect your basement from damp. Some damp proofing renders are cement based and these are either sprayed on or put on with a trowel, depending on the size of the area that needs rendering. Some renders set so that they form a bond with the masonry substrata and creates a barrier to rising damp.

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