A well-designed roof drainage system plays a vital role in protecting flat roofs from water accumulation, leaks, and long-term structural damage. This Rain Water Outlet (Dome Type) Installation Detail illustrates the complete construction of a dome-shaped roof drain, a solution widely used in commercial buildings, industrial facilities, and residential projects.

At the center of the detail is a stainless steel dome grate with evenly spaced openings that allow rainwater to flow efficiently while preventing leaves, gravel, and large debris from entering the drainage pipe. A surrounding gravel layer further improves water flow and minimizes the risk of clogging.

The drawing clearly presents each construction layer, including 400 × 400 × 40 mm white concrete tiles, a geotextile protection layer, 50 mm extruded polystyrene (XPS) insulation boards, a 5 mm waterproofing membrane applied over a bituminous primer, and lightweight concrete laid to a minimum 50 mm slope. Together, these layers provide thermal insulation, waterproof protection, and effective drainage toward the roof outlet.

Below the waterproofing system, the reinforced concrete (RCC) slab supports the entire roof assembly, while a PVC sleeve protects the vertical drainage pipe passing through the slab. Special attention is given to the waterproof connection around the roof outlet, helping reduce the risk of leakage at one of the most vulnerable locations on a flat roof.

Although it represents a relatively small construction detail, this drawing provides all the essential information required for accurate installation and long-term performance. Proper execution of this roof drain detail helps prevent standing water, improves drainage efficiency, and extends the service life of the roofing system.

88.Free Download of Rain Water Outlet Dome Type Installation Autocad Drawing DWG

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