• Good workability – High flexibility in cutting / sawing, shaping, nailing and drilling like those in wood using hand tools and power tools.
  • Easy handling- This happens due to low density and rapid construction reducing construction labour cost and time.


  • Applying thin-bed mortar with toothed trowel (width corresponds to block thickness).
  • Aligning blocks with rubber mallet and water level.
  • Cutting pieces to fit with marking triangle and hand saw.
  • Correcting unevenness with sanding board or plane.


  • The jointing mortar shall be leaner i.e. 1:6. The mortar shall not be spread so much ahead of the actual laying of the units that it tends to stiffen and lose its plasticity thereby resulting in poor bonding.
  • Consistency as per requirement of the site must be maintained at the point of laying.
  • Laying of AAC block masonry shall be in accordance with the recommendations of IS 6041 of 1985 and IS 1905 of 1987. The maximum joint thickness (Vertical and Horizontal) shall be 10-12 mm.
  • The laying of blocks may be started either at the corners first or may be  from one end and proceed to the other.
  • First, lay 10 mm thick cement mortar uniformly over bed. Wet the blocks on all sides by using a tray filled with 20/25 mm water and place them one by one and press it firmly to have a proper bond. Ensure proper spread of mortar in the joints between the blocks.
  • The first course of the cellular block masonry should be laid with great care, making sure that it is properly aligned, leveled and plumbed, as this may assist the mason in laying succeeding courses to obtain a straight and truly vertical wall.
  • Ensure that all the surfaces of the block which comes in contact with cement mortar are wet to have proper bonding.
  • To maintain proper cement mortar filling at the sill level, please check the height of masonry and distribute the same along the joints and in case the gap is more, the same can be adjusted in the bedding mortar. Later the joint shall be filled up with jute strips dipped in cement slurry so that flexible jointness can be maintained at that level.
  • Before laying the mortar, two 10 mm square rods can be placed on both the sides of the block to obtain an uniform joint.
  • The mortar joint shall be struck off flush with wall surface and should be compressed tightly, once the mortar stiffens.
  • Once the masonry is erected, the curing shall be minimum unlike brick masonry. Usually more curing is required at the joints.
  • Before plastering, cement slurryshould be applied on the walls and only leaner mix has to be applied. The thickness should be within 10 -12 mm in the external walls and internal application, in case of dry walls plastering can be avoided. In such a case, P.O.P/ Gypsum plaster can also be applied directly.
  • Maximum erection of 5-6 courses is desirable in a day.