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Deleted member 174758
Ideally use mineral wool (e.g Rockwool, Earthwool, etc) as it has better sound insulation properties than fibre glass- There's quite a large gap (10cm all the way up) between door frame and wall which needs insulated. Is it best to use expanding foam or fibreglass insulation material?
Glad to hear that you've decided to keep the door. Original Victorian front doors were very common in my childhood/youth (the 1960s) but have all but disappeared