Pipe frames, fabricated from 18 mm (3/4") internal diameter (ID) water pipe,
were bent to shape by hand around wooden blocks fastened temporarily to the loft
floor. If available a pipe bender would be a useful time saver at this stage of
construction. Fig. 2 shows a completed pipe frame, with its deck beam already bent
to the correct camber and welded in place, being checked against the loft lines.
Positions of waterlines are then marked on each frame to assist in setting up.