The unit 1 comprises a web 2 of a damp-proof material and support means 3 for receiving a suitable filler material, so that when the filler material is set, central web 2 is supported through its whole surface-area. The support means may be formed from a perforated or perforatable ...
A UNIT FOR FORMING, AND A METHOD OF INSTALLING, A DAMP-PROOF COURSECOLIN JOSEPH * SHEFFIED