I have a 70s house and had the windows done in UPVC. The internal sills are thin tile with the cavity right underneath. Very cold in winter (there is a 4 degree C diff on surface of tile with the outside wall internal surface!). I am going to replace the tiles with oak say 20mm thick. What material should I use under the wood to fill the cavity to reduce the cold hitting the sill? Thanks.
Window sills.
- Thread starter omits
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Use Rock wool cavity slab to bridge the cavity
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