Roladuct is a spiral column used as formwork for concreting. The Roladuct sometimes call pier liners, column formers, pipe liners, void forming tubes and grout tubes. They are light weight but strong and easily installed. Roladuct is available in custom sizes from 100mm diameter to 2500mm diameter. Lengths can be specified up to 12mtrs provided this length can be transported. BC Sands stock sizes 203mm,254mm,305mm,356mm,406mm, 457mm,508mm & 610mm. Standard lengths available are 3000mm & 4000mm.