Is retrospective filling of cavity bad?
Where a cavity is filled retrospectively it can cause problems. This is because originally the cavity wall ties were not galvanised and therefore prone they rust, so any dampness in a cavity can cause this rusting. As explained, the outer layer of brick gets wet and dries with the natural cycle, it stays wetter in areas where the sun cannot get to it and where there is a lack of air movement. Unfortunately, the older original style of insulation is said to encourage the dampness across the cavity and into the inner brick or blockwork, meaning some dampness can get through the inside of the property. Whilst we think that problems with dampness has been exaggerated out of all proportion by those that have a vested interest in the damp proofing industry it can nevertheless look unsightly and be a health problem in extreme circumstances (or so we are lead to believe by what we believe). The other problem with pumps or blown insulation is even where there wasn’t a problem originally the ins
