The gutters are fabricated on site by coiled aluminium sheet, roll-formed on an American Knudson Gutter forming machine. Seamless runs to exact site measurements are formed at a rate of 9 metres per minute up to the maximum length, which can be handled conveniently on site.

The formed gutter is lightweight and rigid – three men can easily place a 30-metre length in position.

Concealed brackets at 600mm – 750mm centres are screw-nail fixed to timber, or riveted on to asbestos fascias. The pre-formed aluminium corner and stop end units are fixed with pop rivets and silicone sealed.