The basement building was made of reinforced concrete with brick stairs. Houses were constructed with walls of wooden planks, mud, laterite brick, or stone. The buildings were made of brick or stone. Special chainsaws can cut concrete, brick and natural stone. Interior walls were a mixture of conventional brick and blockwork construction. The heat exchangers were vented through brick or masonry chimneys. The walls were of unadorned rough brick. The structure was of red brick and marble lining. The Scheduled Caste people are able to build brick and stone houses. Daugavpils is exceptionally rich in red brick buildings. The clay was shaped and fired in a series of brick and tile kilns. The granite base is capped with a dome built of brick and pilaster. Cellular bricks have depressions exceeding 20% of the volume of the brick. It was made of brick and marble. The fronts had facades with lines painted on the surface imitating brick mortar.