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Application Area Façades and Flat Roofs

Drainage of Façades and Flat Roofs

Various standards and guidelines must be taken into account when draining flat roofs, roof terraces, balconies and façades. Surface water penetration due to driving rain, slush formation or splash water can cause major damage to the fabric of buildings. Therefore, precipitation must be safely and quickly drained away from the building. In this context it is important, on the one hand to permanently protect buildings of all kinds from standing or pressurised water and, on the other hand, to ensure the barrier-free construction of entrances and transitions.

On this page Challenges Sealing of substructure areas Sealing of non-substructure areas Product comparison Installation situations

The choice of façade channel

Every drainage project is unique. With the right planning and choice of product, every flat roof and façade drainage project will be a success.

There are various technical and constructional specifics in the drainage of façades. For example, the drainage ­system should have a construction width of more than 15 cm, unless the splash water exposure is minimised by a roof. Low installation heights and the correct installation often place high demands on the product to be selected. In addition, the façade channel should be corrosion-resistant, as it is frequently exposed to cleaning solutions.

Challenges in façade drainage

Sealing of substructure areas

The connection height of the sealing to rising structural components should be at least 15 cm above the surface covering or gravel fill. This is to prevent precipitation water from penetrating through the door or window areas in the event of driving rain, slush formation, wind pressure, icing or water accumulation due to blocked drains.

A reduction of the connection height to 5 cm is possible if proper water drainage is ensured at all times and the splash water exposure is minimised. In case of a reduction to below 5 cm and up to 2 cm, a drainage channel or a comparable construction with direct connection to the drainage must be used in the immediate door or window area.

Drainage in accordance with flat roof guidelines for a penthouse in Wiehl
Barrier-free drainage for a penthouse in Wiehl
Drainage of areas under buildings
Drainage of areas under buildings

Sealing of non-substructure areas

Here, too, the sealing should be placed at least 15 cm above the ground surface (access) to prevent rainwater from entering the building or running down behind the sealing. For lower connection heights below 15 cm, direct water drainage in the door area must be ensured and the splash water exposure minimised.

“When it comes to the drainage of façades, balconies and flat roofs, there are standards and guidelines to consider in addition to technical and constructional peculiarities. I would be happy to support you with my many years of experience in the field of façade drainage with all the requirements in your construction project.”

Patrick Riewe Area Sales Manager at HAURATON
Product comparison for façades and flat roofs
Product comparison for façades and flat roofs
Attribute STEELFIX REGULAR STEELFIX FLEX DACHFIX STEEL DACHFIX POINT DACHFIX RESIST FASERFIX KS RECYFIX PRO
Load class according to EN 1433 A 15 – A 15 A 15 A 15 Up to F 900 Up to C 250
Load frequency 3 out of 5 2 out of 5
Load dynamics 3 out of 5 2 out of 5
Nominal width | System size 115, 135, 155, 205, 255 Customised 115, 135, 155, 205, 255 30/30 & 40/40 115 100, 150, 200, 300 100, 150, 200, 300
Materials of the lower parts Galvanised or stainless steel Stainless steel, galvanised steel, corten steel Galvanised or stainless steel Galvanised or stainless steel Recycled composite Fibre-reinforced concrete Polypropylene (PP), 100 % recycled composite
Angle housing

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Galvanised steel or stainless steel angle housing with 20 x 20 mm insertion depth

Recycled composite angle housing with 20 x 20 mm insertion depth
Grating variants

– FIBRETEC design gratings
– Mesh gratings
– Longitudinal bar gratings
– Perforated gratings
⇒ Made of composite, galvanised or stainless steel

A wide range of gratings with customised bar spacings and surfaces are possible,
e.g.:

  • longitudinal bar grating
  • transverse bar grating
  • perforated grating
  • mesh grating

⇒ Made of galvanised steel, stainless steel

– Slotted grating
– FIBRETEC design slotted grating
– Mesh grating
– Longitudinal grating
– Perforated grating
⇒ Made of recycled composite, galvanised steel, stainless steel, ductile iron

– Longitudinal grating
– Mesh grating
⇒ Made of galvanised steel, stainless steel

– Slotted grating
– Mesh grating
– Longitudinal grating
– Perforated grating
⇒ Made of recycled composite, galvanised steel, stainless steel

– Reinforced slotted gratings
– FIBRETEC & METROPOLIS design slotted grating
– Perforated grating
– Longitudinal grating
– Mesh grating
– Ductile iron grating
⇒ Made of ductile iron, recycled composite, galvanised steel, stainless steel

– GUGI gratings made of PA-GF
– Longitudinal grating
– Mesh grating
– FIBRETEC design slotted grating
– Reinforced slotted gratings
⇒ Made of ductile iron, recycled composite, galvanised steel, stainless steel
Accessibility

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Yes

Yes

Yes

Yes

Yes
Gradient

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Special characteristics

– Channels in closed design
– Design based on standards & guidelines
– Channels in flat design possible
– Perforation in the base of the drain element – on-site connection
  • Removable side panel on the façade side for easy inspection of the pane
  • Channels and gratings can be individually adapted to the project
  • With optional drip tray

– Design in accordance with standards & guidelines
– Practical height adjustment
– Channel in shallow design possible
– Easy drainage connection through perforation in the channel bottom

– Height adjustment achieved through modular design
– Connection options for cross-intersection channel  and pipe connection

– Corrosion-free variant
– Channel in shallow design possible

– Boltless quick lock SIDE-LOCK
– 10-fold fastening possibility of the grating per metre

– Pre-assembled ready for installation – channel and grating = one component
– Low weight
– Channel body made of (polypropylene) can be easily machined, cut, drilled on site

References for façades and flat roofs

Custom solutions for special requirements

As an expert for comprehensive rainwater management we also offer you the right solution for special façade drainage requirements such as ventilated façades (base channels), radial channels or removable side walls.

Contact us here

Questions?

Our experienced planning team will be happy to help you.

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Questions?