Decorators caulk or expandable foam for solving draughty skirting boards?

Posted 1st Jan 2021
Given the current cold weather, our draughty kitchen skirting boards are really noticeable and costing a fortune in heating bills!

We have laminate wooden floors and natural wood skirting boards, so I have bought some coloured decorator's caulk to seal up the gaps at the bottom of the skirting boards.

However, someone has recommended expanding tape foam (not the stuff in a can) to seal the gap. As well as blocking up the gap, they assured me the tape foam would do a much better job of heat insulating against the cold air than caulk would do.

Is this true? Why would (what is essentially) expandable sponge on a tape be a better heat insulator than caulk?
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