Loft Lifters are easily fitted, purpose designed, strong reinforced polypropylene elevators which enable the addition of at least 180mm (7") of roof space insulation and the subsequent fitting of a walkable floor. Most houses are constructed so that roof trusses or joists are located about 400mm (16”) apart. Loft Lifters should be positioned on the trusses at intervals of 600mm (24”) so that they can adequately support flooring materials subsequently secured to them. The Barbed Base will push down and over floor joists of between 45mm and 50mm thick. If more space is required extension tubes are available which will extend the vertical distance of Standard Loft Lifters by 70mm. This will enable the provision of an additional 70mm roof space insulation and the subsequent fitting of a walkable floor.