Dachuntersicht mit PREFA Dachrinne, Rinnenkessel und Ablaufrohr in Anthrazit mit PREFA Siding.X Fassade in Patina grau

Half round gutter

A roof drainage system as an integrated whole: the aluminium half round gutter perfectly rounds off your PREFA roof system.

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PREFA gutters have been tried and tested for decades and their appeal lies in their well-thought-out, detailed technical solutions. Thanks to the proven surface treatment, they remain functional and attractive for many years. PREFA gutters are produced from powder-coated aluminium strips. Alloys according to EN 573 or DIN 1725 make up the basic material for this. 

Advantages of PREFA gutters

  • Surface treatment in a coil-coating procedure
  • Corrosion-free and long service life thanks to aluminium
  • Tested original quality
  • Resistant to constant temperatures of between –30 °C and +80 °C
  • Can be used creatively thanks to a range of 12 colours plus additional special colours (on request)
  • Particularly low maintenance
  • Comprehensive gutter accessories

Colour overview (13)

The product is available in the following colours




250 | 280 | 333


01 Braun

P.10 brown


02 Anthrazit

P.10 anthracite


03 Schwarz

P.10 black


07 Hellgrau

P.10 light grey


10 Prefaweiß

P.10 prefa white


11 Nussbraun

P.10 nut brown


PREFA dunkelgrau ähnlich DB 703 oder RAL 7043

P.10 dark grey


04 Ziegelrot

brick red


05 Oxydrot

oxide red


06 Moosgrün

moss green


08 Zinkgrau

zinc grey


12 Silbermetallic

metallic silver


13 naturblank

plain aluminium


  • The RAL values stated are merely approximate values (~), some of which may differ vastly from the original PREFA colour and, under certain circumstances, may not reflect the subjective perception of the colour. 
  • Above all for colour quality P.10, it is almost impossible to define values due to the surface structure.
  • Plain aluminium: The guarantee does not cover surface appearance alterations caused by processing and environmental influences. Follow the instructions.
  • Metallic colours may vary in shade.
  • To identify exact colours for complementary components please consult original samples.

Technical information

The coating layer is malleable and protected against general chemicals and weather conditions. The coil-coating process is subject to strict quality controls.

In addition, the long-term behaviour is analysed in salt spraying, condensation and water immersion tests.

Temperature resistance

Between –30° and +80°

Quality controls

layer thickness, gloss level, shade, paint hardness, paint adhesion, paint bonding, deformation resistance, paint hardening

Gutter dimensions (piece lengths: 3 m and 6 m)

250, 280, 333, 400

Aluminium downpipe (piece length: 3 m)

Ø 60 mm, Ø 80 mm, Ø 100 mm, Ø 120 mm, Ø 150 mm

Planning and installation

More product information is available for downloading here


Here, you will find a list of matching accessories for the half round gutter.
For a complete, detailed list of accessory products, see our price list (only for processors).

Gutter bracket

250, 280, 333, 400

Upright gutter bracket

280, 333, 400

Gutter bracket (Switzerland)


Fascia bracket

250, 280, 333

Gutter end cap

250, 280, 333, 400; can be used on both sides

Radius end cap

333; ca be used on both sides

Adhesive end cap

333; can be used on both sides

Gutter corner 90° (internal)

250, 280, 333, 400

Gutter corner 90° (internal)

250, 280, 333, 400

Gutter outlet

250, 280, 333, 400

Diagonal outlet

250, 280, 333, 400; can be used on both sides

Gutter expansion joint with bead and cover plate

250, 280, 333, 400

Gutter expansion joint without bead or cover plate

250, 280, 333, 400

Reinforcement hanger for aluminium gutter

250, 280, 333, 400

Eaves drip edge

230 × 2.000 × 0,70 mm