FREQUENTLY ASKED QUESTIONS
Autoclaved aerated concrete (AAC) Block is a lightweight, precast building product used around the world as a superior substitute for traditional clay bricks and is available in blocks of various sizes. AAC Block is an ideal material for structural walls.
AAC blocks are light in weight, larger in size, saves labour cost. Also construction time is less. AAC blocks are accurate in sizes in mm so accuracy in wall construction is there.
Yes, AAC blocks can be used for load bearing and non-load bearing purpose.
Do not use chisel and Hammer for chase cutting. Use saw or any mechanized cutting tool for cutting.
Yes we do. We supply Block fixing adhesive for AAC blocks.
For electrical conducting, preferably use electric chaser machine. It gives fine and accurate chasing and no impact on AAC wall. Manual chasing using normal chisel must be avoided.
Many of the conventional exterior finishing system such as one coat plastering and two coat systems can be used over AAC Blocks as an exterior finish; can just apply Putti and start painting the interiors.
Deflection of beam, soil settlement to one side, uneven placing of blocks during construction are some reasons of wall cracking. Structural Movements due to Thermal Expansion or change in moisture content or moisture movement. To overcome this, AAC blocks must be used delayed till equilibrium moisture content. For this purpose AAC blocks must be stored 10-15 days prior to application. Cracks are appeared in all type of concrete including clay brick. By using some construction techniques and proper workmanship we can minimize these cracks. Levelling of blocks should be accurate and must be checked using Spirit level preferably of 2 met length. First Course of Blocks should be given sufficient time to set and at least 24 hours must be given. Framed Structure should be given enough time to cure and settle so that any change in structure due to structure movement can be noticed. Control Joint of 10 mm must be given after every 3 meter from bottom to top of wall. Control joint must be filled with some resilient material or backer-rod which is more easily compressed. And seal with caulking. Expansion Joint Ties must be given after every 3rd course and placed between gaps of control joint. Bond beam must be given after every 1200 mm in height using reinforcement of two MS rods. Minimum thickness of bond beam must be taken 3” with concrete cover 15-20 mm on sides. Bond beam must be discontinuous at control joint. Mortar Mix for filling the bond beam can be taken as Cement: Sand in the ratio 1:4. Purpose of bond beam is to give Stability and Strength to the wall. After every 3rd course, Wall ties must be used between block and Concrete column.
Yes, when we apply mortar on blocks, AAC absorbs certain amount of water from mortar mix and mix may get crack so prior wetting of blocks is essential. For this purpose we dip the block in water drum completely for few seconds and take out. If water drum is not available, we can wet the blocks by other convenient methods but purpose is to wet the surface of blocks. Never do too much wetting of blocks.
No, in AAC water does not pass through due to discontinuous air pores. While in red clay brick, due to high capillary suction, water penetrates through it.
Yes, AAC has thermal insulating properties; its thermal conductivity is 1/5th of clay brick. So AAC conserves the heat for a longer period and saves energy cost due to air conditioning or room heater.