That's because they saved money by not bothering with the adhesive that the applicator nozzle is supposed to spray over the balls as they are blown into the cavity.
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6 years ago
Is cavity wall insulation frowned upon?
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6 years ago
Had ours done with foam about 30 years ago - no damp.
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6 years ago
Mostly filled cavities are all fine. Mine is blown fibre (strangly, done at build time, and injected from the inside), and my parents had blown fibre done 5-10 years ago in their 1950's house without any problems.