To fill hollow interlocking CSEB blocks, place and compact mortar in the vertical holes after every fourth course of blocks to provide reinforcement. You will need to use a strong, well-mixed mortar, and ensure it is compacted into all vertical holes. The process involves laying the blocks, then adding mortar to the holes for structural integrity and stability, especially in load-bearing walls. 1. Prepare the area Ensure a level foundation: Lay the first course of blocks on a thick layer of mort

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