DIY Tips - Guttering

The primary purpose of guttering is to collect rainwater from the roof and channel it to drains under the ground.  There is great variation in the shape, size and materials used for guttering.  The original material was cast iron, but plastic is normally used these days.  You can also come across guttering constructed from galvanized steel, asbestos cement and aluminium.

The main shapes for guttering are half-round, moulded and square, with ogee moulded being the traditional moulded shape.  Guttering is manufactured in standard lengths which have to be joined up.  The lengths are supported by two brackets or more, some of these being combined with joint units.

Lengths are joined at corners using right-angle elbow joins, although different angles are available for the likes of bay windows, and stop-ends are fitted at the edges of a roof.  An outlet is connected to the gutter to direct rainwater into a downpipe which will take it to the drains, with the downpipe having its own brackets and elbows as well as an outlet at the base.

Hopper heads are fitted to single downpipes in the case where there is more than one of these, with pipes running from the gutters dumping their water into the hopper heads, after which it flows to the underground drains.

For most modern housing, standard guttering of 115 mm is used in conjunction with 70 mm downpipes, although on larger houses deep-flow guttering which has a greater capacity is used.  On garages and outbuildings you can usually get away with using 75 mm guttering and 50 mm downpipes.

Leave a Reply