The H+H Celcon Block Coursing Units 3.6N 215 x 100 x 65mm is made from aerated concrete with a compression strength of 3.6N. The concrete brick can be used in both external and internal load bearing situations such as infill above doors and windows or coursing at the ceiling. It is lightweight, strong and easy to work. The coursing block is compliant to BBA certification and has a fire resistance rating of A1.