Just get a tube of CT-1 and fill every gap and crack you can, any big gaps then a bit of rolled up newspaper stuffed behind, it's what builders do...
any big gaps
The traditional method is stuffing with oakum. Newspaper is probably a bit more readily available though.
@NotThamesWater started
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Just get a tube of CT-1 and fill every gap and crack you can, any big gaps then a bit of rolled up newspaper stuffed behind, it's what builders do...