Peemac, if proper ventilation is the root cause, can you clarify possible reasons why - if there was no dampness in the house 7 years ago - it could now be the issue?
Prior to installing cavity insulation, many houses have a myriad of drafts and air leakage points that facilitate regular air changes so that moisture does not build up within the house. When you install cavity insulation you usually significantly increase the air-tightness of the house and need to compensate by adding increased ventilation.
The house is two-storey and it's an external blackish staining in one spot just above the first floor. There are no trees over-shadowing the building and the gutters were cleaned last year. I will check the gutters again and I'm thinking of spraying the darkened area with a dilute chloras solution.Could you be a bit more specific about the staining? Where it is happening on the walls, is the house 2 storey, bungalow, a dormer, etc. Is it overshadowed by trees, are gutters cleaned, etc, etc?
This is possibly true because the ventilation wasn't increased after insulation.When you install cavity insulation you usually significantly increase the air-tightness of the house and need to compensate by adding increased ventilation.
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