Is thin bed mortar to be used for bedding the first course of AAC?
The first course of blocks are always laid in thick bed mortar mix made of 1:4 (by volume) cement: sand added to it as a bonding agent @ 10% of water. This serves as a leveling pad for the first course of blocks. Care must be taken at this stage to ensure the blocks are plumb and level so further construction up to ceiling height will be fast and accurate. The second and successive bed joints may use thin-bed mortar, which is a pre ploymerised & is a non cement-based product and inorganic fillers such as flyash etc. Head joints always use thin-bed mortar. When thin-bed mortar is used, a joint thickness of 1/16-1/8 inch is realized.
