Post in diyuk mate
Just remember expanding foam can damage wood awhile it expands. Also it's pain to remove. You can get low expansion foam as well I heard
You can also get foam inserts you shove in. Just make sure you get the right size for what you need. They come in different thicknesses.
Example : Everbuild Foam Sealant Joint Backer Rod 10mm x 10 Metre https://amzn.eu/d/91FDuRq |