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Applications of ACO façade channels

Façade drainage in a system

ACO façade and terrace channels are used to comply with the requirements of regulations and to prevent water from being pushed up as a result of wind stress or from accumulating in front of particularly vulnerable areas.

The formation of snow drifts, slush and ice must also be taken into account. Snow drifts in front of doors thaw first - due to increased heat radiation in these areas. The runoff of the melting water in this area is then often inhibited by the remaining snow or slush surrounding it. In this respect, drainage channels must also and especially be suitable for such water stress. The gutter height must be adapted to the actual moisture load. Appropriate hydraulic proof can be provided at any time by the ACO Hochbau application technology department.

Essential for assessing the effectiveness of drainage channels are therefore their location, size, the opening cross-section of the cover and the channel body as well as the installation situation.

A drainage channel will only be able to develop its full effectiveness in reducing the moisture risk in the area of a door threshold if it extends at least over its entire width and is positioned sufficiently close in front of it. This should usually be the case if it is no more than 5 cm away.
Deposits due to dirt ingress are largely retained by the channel body and can be easily removed through the closed channel bottom without damaging the seal. Regular maintenance should be a matter of course here.

The safe drainage of rainwater as well as suspended matter takes place in terrace drainage via the lateral drainage slots into stub channels leading to the drains, into the free space under slab coverings on stilt bearings/mortar bags or into the drainage layer. The drainage slots should not be smaller than 4 mm, otherwise there is a risk of sintering here. The use of chippings smaller than 4 mm is not critical, because experience shows that only a little chippings penetrates through the drainage slots into the channel due to the wedging. If deposits collect on or in the grating due to an inserted dirt fleece, the entire construction is to be judged as critical.

Perforation of channel bodies on one side of the façade is not advisable, as this is a loosely laid open channel system in which moisture inevitably also settles on the façade side. With perforation of the gutter sides on both sides, the moisture is considered to be pressureless and to dry off quickly.

System structure


  • Safe and fast drainage even of large amounts of rain
  • Additional backwater reserve in case of sudden rainfall
  • Avoidance of puddles of water in the façade area
  • Protection of the interior from moisture penetration
  • Avoidance of water splashing up during driving rain
  • Use as a grating for maintenance and care

Evaluating the actual moisture stress

The actual moisture and water stress depends on the region in which the building project is located, i.e. on the rain and snowfall intensity as well as the prevailing wind directions and on the existing protection, e.g. through roofing. A corresponding assessment can be made at any time by the ACO Hochbau application technology department.

The water-bearing layers

The water-bearing layers are considered to be the waterproofing layer and the covering layer. In the case of inverted roofs, the insulation level is also included.

The slope

The waterproofing layer should have a planned slope of at least 2 % away from the connection point. The covering level should have a planned slope of at least 1 % away from the connection point.

The ACO branch channel and attachments for roof drains

For the ACO Profiline, ACO Profiline X and ACO Greenline 3.0 channel systems, there is a branch channel and various sized attachments for roof drains as a maintenance shaft available as accessories for all systems.

The branch channel is a 3 cm high and 10 cm wide hollow body with lateral 4 mm drainage slots. Its front side is butted against the drainage slots of the channel body and the attachment for roof drains and lies within the drainage layer. It therefore connects the channel body and the attachment and thus forms a defined drainage channel or is a direct connection of the channel to the drains.

The attachments for roof drains must be arranged above the roof drains as an inspection shaft in the case of patio areas. Gratings that are firmly embedded in the terrace decking must not be firmly connected to the roof drain at the same time.