Concrete Canvas have developed shelter variants with 25sqm and 54sqm of floor space. The technology can be scaled up to provide even larger structures. All shelters have lockable doors at each end, available in either translucent polycarbonate or aluminium skin composite panels for secure applications. Each shelter is lined with a flame retardant fibre reinforced polyethylene inner. This provides a hard wearing ground sheet which can be upgraded to a concrete floor, using Concrete Cloth, for long term applications.