It’s not a 10mm gap, but the smallest joint filler foam strips come in 10mm I think?
Ah, ok. I reckon stuffing something made for 10mm I to that gap won't look very tidy.
Foam strips for gaps around doors come in a variety of sizes. But I'd lean towards silicon if there is not much movement.
@Backstop started
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It’s not a 10mm gap, but the smallest joint filler foam strips come in 10mm I think?