The square downpipe of the Streamline Gutter System is designed to complement all functional and visual aspects of the eaves gutter components and is available in lengths of up to 6.0 metres. The downpipes are 95mm square and constructed from 0.7mm thick, double sided, plastisol coated steel, seam jointed at one corner, which is usually placed away from the line of sight. A range of accessories for fixing the downpipes are manufactured in the same materials.

The size of the downpipe is designed to meet the gutter's flow capacity to produce an efficient and practical system. The following recommendations for the spacing of downpipes are based on the guidelines of BS 6367 'Code of Practice for Drainage of Roofs and Paved Areas'. The rate of rainfall used is 75mm per hour and calculations are on a gutter flow rate of 15 litres per second and a downpipe capacity of 7 litres per second. The distance between downpipes is determined by the least value of the following conditions.

1. Two downpipes are required as a minimum in any one length of gutter.
   
2. Downpipes to be spaced at maximum centres of 13 metres. (6.5 metres from a stop end).
   
3. Maximum roof area per downpipe - 300m2.

Downpipe Brackets

The downpipe must be supported at centres not exceeding 3.0 metres. This must be provided within 200mm of the gutter and within 1.0 metre of the base.

Two types of bracket are available. SDPB95 is suitable for fixing to profiled wall cladding such as Ward Wall - Profile Rib DR1000W and Ward Wall - Trapezoidal IP1000 sidewalls. This bracket may also be used on flat sidewall cladding. Where a concealed fixing is required to complement the wall cladding, bracket assembly SDPS95 is used. This bracket may only be fixed to flat sidewalls as the Ward Wall Insulated panel range.

Downpipe Bracket Options

Fixing bracket SDPB95. The bends are formed on site to suit gutter offset

Fixing bracket assembly SDPS95 suitable for flat wall panels only

Joint at Downpipe

Joints are formed between lengths of downpipe by using a joint collar SDPC95 rivetted and sealed to the ends of each pipe.

A downpipe support bracket must be used at each joint position.

Downpipe Base

The downpipe may be formed on site to give a shoe for discharge into the ground drainage. Alternatively, square to round gully adaptors may be used as the basis for linking to 100mm or 150mm diameter ground drainage.

Downpipe/Gutter Connection

The downpipe is connected to the underside of the gutter by means of sealing and rivetting to flanges formed during fitting on site. These flanges are formed with the assistance of an outlet forming tool FT95