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Eaves gutters rainwater systems

Main characteristics

Our half round, box section or ogee zinc gutters are available in various sizes and finishes. They collect rainwater at the eaves of pitched roofs and channel it to the downpipe, and are part of a wide range of rainwater drainage goods.

Check out our elZinc® rainwater guttering and drainage product catalogue:

Download the elZinc® Rainwater guttering and drainage catalogue

Eaves gutters zinc

Advantages of zinc gutters

  • Tried and tested systems used for generations
  • Attractive designs in half round, box section and cornice styles
  • Very long lasting and maintenance free
  • Does not discolour due to UV radiation
Main components of the hanging gutter system

Main components of the hanging gutter system

Un sistema de canalones se compone de diferentes elementos, cada uno de los cuales contribuye a la recogida segura y estanca del agua de lluvia:

1. Half round eaves gutter
2. Box section gutter
3. Moulded gutter
4. Roof mounted gutter bracket
5. External corner
6. Internal corner
7. Stop end
8. Expansion joint
9. Universal outlet
10. Elbow (72º shown)
11. Downpipe
12. Downpipe bracket


Cold climates

In cold climates, snow retention systems should be installed to prevent snow slipping onto the gutters from the roof. This can quickly overload the brackets and damage the gutter – local regulations may apply. If this is not possible for any reason then the gutter’s front edge should not be higher than the projected line of the roof.


Universal outlets: There are various standard dimensions to provide a number of gutter / outlet combinations. The outlet is hooked around the gutter and is free to move so it does not limit thermal movement.
Running (spigot) outlets :are soldered to the gutter, so they do limit thermal movement and therefore an expansion joint must be placed a maximum of 7,5m from them. .
It is good practice to provide an outlet next to internal angles to deal with the extra flow at that point from the valley gutter. Depending on the size of the roof, a corner hopper may be beneficial.

Gutter sizing

The drainage capacity of the rainwater system is affected by the capacity of the gutter to carry rainwater to the outlet, and the capacity of the outlet and rain water pipe to drain that water. In normalised eaves gutter systems, outlets, downpipes and gutters are designed to create free discharge conditions, meaning that only the gutter run needs to be calculated.
Using EN 12056-3, which assumes free discharge conditions, the following tables giving gutter flow capacity and the effective roof area able to be drained by a gutter run is shown. These figures assume nominally level gutters and no wind effect on the effective catchment area. It should be noted that for each corner within the run with a change in direction greater than 10º, both the discharge capacity of the gutter and the roof area it can drain must be reduced by 15%. Further reductions are needed if the outlet is fitted with a leave guard. For more information on the dimensioning of hanging gutters, please consult our technical department.


Gutters lengths are joined end to end and connected to corners and expansion joints using soft soldered joints.


Eaves gutters should be installed to a slight fall to aid their self-cleaning.
Ideally 3 – 5mm / m but at least 1mm / m. This also gives them added flow capacity.


Gutter brackets should be fixed at centres varying from 700mm to 900mm according to the expected snow loads, or can be fixed to line up with standing seam centres (more expensive than the former but generally it looks much better). Two main types of bracket exist – roof fitted or fascia fitted. Roof fitted brackets must be rebated into the substrate to fit flush with the surface. They should be securely fitted, which means they should be either nailed or screw fixed through to the rafters (which in turn means they will not line up with standing seam centres) or alternatively fitted to an eaves board made of solid softwood which allows the brackets to be fixed independently of rafter positions and thus to line up with seam centres – see drawings.

Thermal expansion and contraction

Gutters are installed to allow for thermal movement and the entire system is designed taking this into account. The gutter brackets allow the gutter to slide over them and expansion joints are placed every 15m maximum (7,5m maximum from corners or running outlets) to keep expansion within limits.

Downpipe assembly

Downpipes are fixed to the wall at centres not exceeding 3m using downpipe brackets. These are positioned at the top of each pipe, just below the sleeved end to end downpipe joint (which is slightly wider) and therefore cannot slip through the bracket. The downpipes should be lapped 50mm within each sleeved joint. The pipes should be fixed at least 20mm away from the wall.

Hanging gutter and associated downpipe sizes

Width (w), depth (h) in mm, section (cm2) Corresponding downpipe
GirthHalf round Box section Cornice Round Square
20096, 40, 31, 686, 42, 296060 x 60
250123, 53, 43, 4103, 55, 478080 x 80
280145, 63, 74, 980 / 87
333173, 77, 108140, 75, 90150, 98, 11010095 x 95
400214, 96, 166,1172, 90, 135120120 x 120
500272, 125, 273,1222, 110, 220120 / 150120 x 120

Half round gutter capacity table

Gutter run 250 mm girth 333 mm girth 400 mm girth 500 mm girth
QEffective catchment area in r= l/s ha QEffective catchment area in r= l/s ha QEffective catchment area in r= l/s ha QEffective catchment area in r= l/s ha
<51,0736 m227 m22,6488 m266 m24,63154 m2116 m28,66289 m2217 m2
7,51,0235 m226 m22,5484 m263 m24,48149 m2112 m28,59286 m2214 m2
100,9732 m224 m22,4582 m261 m24,35145 m2109 m28,35278 m2209 m2
150,8829 m222 m22,2876 m257 m24,10137 m2103 m27,97266 m2199 m2
200,8027 m220 m22,1271 m253 m23,87129 m297 m2
‘r’ is rainfall in l/s ha. 300l/s ha is equivalent to 108mm/h, 400l/s ha is 144mm/h. For other rainfall intensities, please contact elZinc®.

Box section gutter capacity table

Gutter run NG 250 mm NG 333 mm NG 400 mm NG 500 mm
QEffective catchment area in r= l/s ha QEffective catchment area in r= l/s ha QEffective catchment area in r= l/s ha QEffective catchment area in r= l/s ha
<51,0234 m226 m22,3879 m259 m23,96132 m299 m27,23241 m2181 m2
7,50,9732 m224 m22,2876 m256 m23,83127 m295 m27,02234 m2175 m2
100,8230 m223 m22,1873 m255 m23,63121 m291 m26,82227 m2172 m2
150,8228 m220 m22,0167 m250 m23,44115 m286 m26,43214 m2161 m2
200,7425 m219 m2,8562 m246 m23,21107 m280 m26,07202 m2152 m2
‘r’ is rainfall in l/s ha. 300l/s ha is equivalent to 108mm/h, 400l/s ha is 144mm/h. For other rainfall intensities, please contact elZinc®.


Download detailed information on rainwater drainage.