BRE IP2/98 PDF

The introduction of more stringent thermal buildings regulations may increase the use of lightweight and thin layer mortar which reduce the thermal transmittance of walling (blockwork). Little experimental information is available, so data have been collected both from relevant literature and from testing mortar samples and blockwork wallettes. The use of lightweight and thin layer mortars seems unlikely to have a significantly adverse effect on the strength of autoclaved aerated concrete masonry, except that the flexural strength of lightweight blockwork is likely to be lower than that of traditional masonry.