Gutter Installation

To select the correct type of gutter profile you require, check the following 5 bullet points:

• The size of gutter you need and it's flow capacity.
• Whether the gutter is fitted level or fall.
• The position of the drainage connection (to determine the position of the gutter outlet).
• If the gutter outlet is at one end or in the centre of the gutter length.
• The maximum roof area to be drained.

Gutter capacity - Outlet fixed at one end of gutter run

Half Round

Square

Ogee

m2

43

78

115

l/s

0.9

1.6

2.4

m2

48

74

138

l/s

1.00

1.54

2.88

Half Round

Square

Ogee

m2

84

155

209

l/s

1.75

3.2

4.36

m2

92

141

251

l/s

1.92

2.94

5.23

Formula

B + A/2 x length of roof = m2

For further guidance consult BS EN 12056, part 3:2000 and The Building Regulations, 2002 Approved Document H, part 3

Gutter Fixing

Fascia brackets should be fixed at a maximum of 1 meter intervals. In areas of heavy snow fall, two screws (1" x 8 recommended) should be used for each bracket and the spacing intervals reduced to 800mm. When fixing to cellular fascia board, use screws which penetrate the full thickness of the board. A fascia bracket should be fixed 150mm from a union, outlet or angle.
Each gutter fitting has a line marked internally, the gutter should be installed to this line to allow room for contraction and expansion.

Down pipe Fixing

Pipe clips should be spaced no more than 1.8m apart. 32 x 6.5mm screws should be used. A supporting pipe clip should be used where sockets, bends, branches or shoes are used. A 10mm expansion gap should be allowed at each joint. Swan Neck Joints should be constructed on site using two offset bends with a short length of pipe.