Is my wall cavity or solid?

How can I tell if the walls are solid wall or cavity walls? We dispel some myths and look at the best way to tell.

[@Timjacks01]

Just a little feedback, stick to 1 unit of measurement instead of going from inches to mm

[@Domesticsurveys]

Thanks Tim, will try for next time!

[@Pete.Ty1]

👍👍👍

[@Domesticsurveys]

Thanks Pete!