Help, what is a solum

[teenybash]

I thought the floor needed a new joist, but have been told it needs a solum.....any idea what it is and what it's for????:)

[adi1]

basically its the damp-proofing underneath the floor
This may help
http://macpres.co.uk/building-preservation-solum-treatments.php

[teenybash]

Thanks adi1.....:)