How to make mud bricks waterproof?

Mud bricks can be made waterproof by treating them with a lime or silicate sealer. The sealer will help to prevent water from entering the brick and reduce erosion.

Additionally, you can also apply a coat of linseed oil or paraffin wax to further protect the mud bricks from water damage. Another useful strategy is to apply a mixture of sand and clay to the surface of the mud brick, which will form a waterproof barrier when it dries.