M C PHILLIPSON* C A FUDGE**S L GARVIN* and A W STUPART* * BRE Scottish Laboratory** Celcon Blocks

Thin joint systems are based on AAC units with smalt dimensional tolerances and a mortar which sets rapidly. Traditionally, mortar bed depths are about 10mm thick, with thin joint systems depth is reduced to 3mm or less. There are a number of potential benefits that can be gained from using thin joint mortar systems which are described in the paper. Construction with thin joints requires some changes to be made to site processes and these may be seen as disadvantages because appropriate training may be required for operatives. There is little room for adjustment of the masonry as it is built, consequently good base preparation is essential. As with alt construction, the quality of workmanship and adherence to manufacturers requirements needs to be ensured for successful construction.