This sequence of thermal images shows a wall in the master bedroom of a 35 year old brick veneer house that had pump-in, cavity wall insulation installed 18 months earlier. (Look carefully and you'll see that the photos overlap slightly.) It was a cool day, ~13 degrees outside and ~16.5 inside.
The yellow/green sections have insulation and the blue areas are empty wall cavities!
The owners report that the house has been warmer since the insulation was installed BUT imagine how much better it could be if it were done properly!
Please note, we have also seen some very good retrofitted cavity wall insulation.
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