Expanding foam cheapest/only/best option?

5 Nov 2010
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United Kingdom
I want to seal the gaps between the roof and walls of my garage.

The previous owner has already used expanding foam in many areas.

I was about to attempt to fill in the rest of the gaps but just wondering if there are other methods?
IMG_20200519_143655.jpg IMG_20200519_144259.jpg IMG_20200519_144304.jpg IMG_20200519_144335.jpg

It seems that some some of the old expanding foam has shrunk a wee bit. Must I remove it before using the new or can I go over it?

Thanks very much and hope you can help.
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