Does bleach affect plant roots?
Jim W writes
A further question would be why do you have algae on your walls? Is the DPC and insulation OK? I've just cleaned the algae off my north facing sheltered wall of the house, using just a pressure hose and it has new dpc and excellent insulation below and in the walls. The greening builds up because the outside surface of the wall is often damp from dew and mist, sometimes all day or several days in a row and because the wall is well insulated its not dried off from conducted heat inside, nor from air movement as its sheltered. You can actually see the vertical strips of the studs behind the plaster in between the patches, presumably the solid wood conducts more heat. At some stage it will be repainted again, and there is a fungicide in the paint IIRC. -- David |
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