How To Kill Mould In Your Sandstone Pavers

Sandstone is a beautiful material that is commonly used as pavers in a number of

applications around the home, including patios, swimming pool edging, floor tiles and wall cladding. As it has a highly porous surface, however, the stone is prone to absorbing mould spores, which will begin to grow if they come into contact with water or excessive moisture. If your sandstone has been infested with a mould growth, there are ways to kill it and prevent it from coming back.

To begin with, you will need to dry the area completely. This is easier if the infected sandstone is indoors, as you can use a hair dryer to dry the mouldy spot as best as possible. If your sandstone is outdoors, you will also need to look at ways to prevent an excessive amount of water from collecting on that particular area (such as downspout extenders or more effective drainage).

Once the sandstone has completely dried, you will need to take a solution of 3% hydrogen peroxide and tip it onto the mould. Using a soft brush, scrub the chemical across the surface, removing and killing as much of the mould as possible. If the mould has been left untreated for an extended period of time, you may find that it has embedded itself deeply into the sandstone. If this is the case, you may need to complete more than one peroxide treatment (leaving the area to dry between each one).

If the mould still stubbornly refuses to be removed, or it continues to grow back after only a day or so, you may not have killed all of the spores. The best way to fix this problem is to scrub at the sandstone again, using a 35% hydrogen peroxide solution on the area this time. If you are having trouble sourcing the 35% peroxide, you should be able to get it from a beauty supply store, as it is commonly used for colouring hair.

Once you have completely removed the mould from the surface and from deep within your sandstone, you will need to properly seal it in order to prevent it from coming back. This is especially important if the area will be frequently exposed to water or moisture (such as a pool area, bathroom or even a kitchen) in fact, your sandstone should have been sealed in these areas the moment it was laid. Remember that some moulds are toxic to human and to pets, so the best way to treat the problem is to prevent it altogether.

by: Harrie Dadhwal

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