Concrete Drainage Systems
Concrete Rings & Inspection chambers have been produced in substantial quantities since the early 1960's and their use has been approved by the Water Board, Local Authorities and Government Departments. Our products are regularly installed by the trade in general and by many of the largest national building contractors. Only first grade aggregates are used in manufacture and by using modern machinery and vibratory equipment, quality concrete in excess of 28kg/cm² (4000 Ibs/in²) is assured. The wall thickness of our units is greater than that recommended in B.S. and this has been done to produce a robust chamber without the use of steel reinforcement. The possibility of eventual damage of cracking by rust corrosion is, therefore, totally eliminated; where there is a known presence of acid in the soil we can further guard against this by supplying units made with sulphate resisting concrete.