12mm thick cement lime sand (1:1:5) plaster finished smooth with lime putty or approved equivalent on internal faces, on blockwalls or ncrete surfaces. Floor finishes J.3 20mm. thick cement and sand 1:3 screed finished smooth with loured cement floating. J.3a Ditto: to verandah: sloped J.3b Ditto: Treads and risrs Plinth Plaster J.4