On properties that suffer from red, brown or orange staining on either rendered, pebble dashed, Krend or slap dashing is due to iron ore pigment in the sand getting wet due to water ingress which then causes them to rust and bleed out through to the surface causing the staining. You will notice on walls that don’t get so much weather or under canopies etc the problem will be a lot less apparent
I know this because we have carried out extensive test on a variety of sands as we operate a exterior cleaning company www.colinsquirebuilding.co.uk and found any mined material such as building sand rock etc will nearly always contain iron fragments.
Visit my website @ www.colinsquirebuilding.co.uk to see how by having your house professionally cleaned without doing any damage to your properties external finish can dramatically improve the appearance of you house.
Painting over the stains is not really an alternative as the stain will bleed through and surfaces such as Krend coloured render etc recommend not to paint as the finish needs to breathe.
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I know this because we have carried out extensive test on a variety of sands as we operate a exterior cleaning company www.colinsquirebuilding.co.uk and found any mined material such as building sand rock etc will nearly always contain iron fragments.
Visit my website @ www.colinsquirebuilding.co.uk to see how by having your house professionally cleaned without doing any damage to your properties external finish can dramatically improve the appearance of you house.
Painting over the stains is not really an alternative as the stain will bleed through and surfaces such as Krend coloured render etc recommend not to paint as the finish needs to breathe.
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