External wall - cavity insulation behind radiators

6 Oct 2004
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United Kingdom
I'm in a 1980's house with cavity walls and no cavity insulation. I'm needing to take some of the window sills out for repair and all of them are on external walls (obviously they cry) and have radiators beneath them. So I'm thinking of insulating the cavity that I will have access to under the sills, directly behind the radiators.
Are there any regs or recommendations here on materials and installation ?
I'm thinking of either rigid foam or something like rockwool merely pushed down into and filling the accessible cavity.
Thanks in advance.
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