Window sills.

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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.
 
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Joined
30 Jun 2021
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Rip a length of polystyrene & jam it into the cavity.
Use sealant to seal any suspect area at the bottom rail of the frame.
MDF window board is available from any supplier or shed.
 

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