HDPE Butt Fusion Recessed Roof Drain Rainwater Hopper for Siphonic Drainage

A recessed roof drain rainwater hopper manufactured from high-density polyethylene, specifically designed for roofs with insulation layers.

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Category: HDPE Siphonic Fittings

HDPE Siphonic Fittings

Product Overview

A recessed roof drain rainwater hopper manufactured from high-density polyethylene, specifically designed for roofs with insulation layers. This HDPE recessed roof drain sits below the finished roof surface to collect rainwater through the insulation layer, feeding siphonic drainage stacks at full bore flow. Built to ISO 8770 and EN 1519-1 for DN 50 to 315 mm siphonic roof drainage systems.

Quick Information

Diameter Range: DN 50 - 315 mm
Applicable Standards: ISO 8770, EN 1519-1, CJ/T 245
Stock: In stock

Specification Table

Parameter	Specification
Material	HDPE PE100
Diameter Range	DN 50 - 315 mm
Application	Siphonic Roof Drainage
Standard	ISO 8770 / EN 1519-1
Connection	Butt Fusion / Socket Fusion
Stock	In stock

Key Features

Recessed Low-Profile Design: The HDPE recessed roof drain installs flush below insulation level, collecting rainwater without raising the finished roof surface.
Siphonic Full-Bore Flow: This siphonic rainwater hopper is engineered to prime instantly and run at full bore, draining roofs faster than gravity systems.
PE100 Weather Resistance: The HDPE recessed roof drain resists UV, thermal cycling and rooftop chemicals for decades of maintenance-free service.
Anti-Vortex Grille: A precision grille on this siphonic rainwater hopper prevents air entrainment so the siphonic action stays stable at peak flow.
Leak-Free Fusion Joints: The HDPE recessed roof drain welds to HDPE pipe by butt or socket fusion, forming a homogeneous watertight system.
Wide Size Range: This siphonic rainwater hopper covers DN 50 to 315 mm to match any siphonic roof drainage design.

Production

Raw Material

Every HDPE recessed roof drain is molded from certified virgin PE100 resin with carbon black UV stabilizer, batch-tested for melt flow rate and density before production.

Molding Process

Each siphonic rainwater hopper is injection molded with precision cores that form the recessed bowl and outlet socket in one cycle, holding dimensional tolerance within 0.1 mm.

Quality Control

Batches of HDPE recessed roof drains are sampled for hydraulic flow testing, dimensional gauging and fusion joint integrity per ISO 8770 and EN 1519-1 requirements.

Applications

Insulated flat roofs on commercial and industrial buildings use the HDPE recessed roof drain for concealed rainwater collection.
Siphonic roof drainage systems on warehouses and logistics centers rely on this siphonic rainwater hopper for high-capacity discharge.
High-rise buildings install the HDPE recessed roof drain to handle storm events without gravity downpipe sizing.
Green roofs and podium decks choose this siphonic rainwater hopper for reliable drainage beneath soil and paver layers.