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How to lay the first row of gas blocks? In this video I will show how I laid the blocks myself. The first row of blocks is laid on a cement-sand mortar. This is done in order to level the gas block in the horizontal plane. If the foundation has large irregularities, then you need to use a leveling layer of concrete or brick. The main thing is to lay the first row of blocks as evenly as possible, so that further construction of walls from aerated concrete proceeds quickly with minimal leveling of subsequent rows. #AlexanderKvasha