A BBC Wales investigation into cavity wall insulation has revealed concerns about unsuitable homes being fitted with the product.
Cavity wall insulation, when fitted properly in appropriate properties, can make the building more energy-efficient. But if installed incorrectly, or in unsuitable properties, it can lead to damp problems.
Simon Haslett, from Newport, believes he is one of the victims of poor pre-installation surveys. He had cavity wall insulation fitted in 2007, by Mark Group, but two years later he discovered dry rot in his home had caused more than £7,000 damage
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