▽ +09.00Technical detail · PS-D-05
Roof drain
A two-level roof drain: the membrane clamped onto the drain flange, and a perforated extension that takes water at membrane and finish level.
+01.00PS-D-05
Section and numbered callouts
Callouts
- 1Grating at finished levelشبكة عند منسوب التشطيب
- 2Perforated extension (two-level drainage)وصلة تمديد مثقبة (تصريف بمستويين)
- 3Bolted clamping ringحلقة ضغط مثبتة بمسامير
- 4Membrane clamped onto the drain flangeالغشاء محصور على فلنجة المصرف
- 5Reinforcing patch around the outletرقعة تقوية حول المصرف
- 6Drain body with flange, set in the slabجسم المصرف بفلنجة، مثبت في البلاطة
- 7Outlet pipeماسورة الصرف
- 8Tiles on bedding mortarبلاط على فرشة مونة
- 9Geotextile separation layerطبقة فصل من الجيوتكستايل
- 10Insulation cut around the drainعزل حراري مقصوص حول المصرف
- 11Screed falling to the drainصبة ميول نحو المصرف
- 12Concrete slabالبلاطة الخرسانية
+02.00About this detail
What this detail solves
The drain is the lowest point of the roof; all the water on the membrane ends there. The screed falls to it with a sump around the outlet, a reinforcing patch goes down, and the membrane is laid into the drain flange under a bolted clamping ring. In an inverted roof a perforated extension takes water at membrane level and at tile level, capped by a grating at the finished level.
Critical points
- Use a drain with a flange and clamping ring that suits the membrane — and a two-level drain on inverted roofs.
- Fix the drain body before the screed; set the flange flush with the screed surface.
- Lay the reinforcing patch first, then the membrane under the ring; tighten the bolts evenly.
- Cut the insulation around the drain without covering its openings.
- Clean and test the drain after the finishes; no mortar left inside.
Notation in this drawing
- FFLfinished floor level
- FALLdirection of the falls
- NTSnot to scale
+03.00Downloads
Detail files
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Detail sheet — PDF (A3 landscape, Arabic & English)
Typical detailAR · ENR02026-10-08325 KB
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+04.00Related
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