How to choose drainage pipes and fittings
Drainage is not a “pretty” choice — it is functional. The wrong diameter or an indoor pipe outdoors ends in smell, blockage or a broken line. This guide sorts drainage choice. Alongside: siphon, plumbing map.
First — where the line goes
| Place | What to take | What not to fit |
|---|---|---|
| Indoors (HT) | Indoor system, e.g. Ostendorf HT | Outdoor PVC “because cheaper” |
| Outdoor / ground | Outdoor-class pipes (PP/PVC/PE per project) | Indoor HT without protection |
Details: indoor or outdoor.
Diameter (DN) — briefly
DN50 often for basin/shower locally; DN110 — stacks/toilet. Numbers must match the project. Full explanation: what diameter means.
HT examples: DN50 × 250 mm, DN50 × 500 mm, DN50 × 1000 mm, DN75 × 500 mm, DN110 × 250 mm, DN110 × 500 mm. Compensation short pipes: DN50, DN110.
Floor drain, channel, siphon
Floor water collection ≠ siphon under a basin. Floor drain/linear channel: comparison. Siphon: how to choose a siphon — e.g. Viega basin siphon, Viega bath siphon.
Typical mistakes
- Mixing indoor and outdoor materials.
- Reducing diameter “because the shop ran out of DN110”.
- Forgetting compensation / cleaning points.
- Installing without fall (water stagnates, smell comes).
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