US 5,144,782 AGranted

Double-level drainage system for flat roofs

OwnerJean-Paul Paquette, Luc Trudeauinventors

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Abstract

A draining system for water which may collect between the upper and lower membranes of flat, horizontal or slightly sloped insulated roofs upon perforation of the upper membrane. The insulating panels located between the two membranes are provided at both their upper and lower faces with a network of intersecting grooves, and these networks communicate with each other through passages made through the insulating panels or constituted at the panel joints. A lower drain member is sealed to and opens above the lower membrane to drain any water having seeped under the broken or perforated upper membrane, so as to prevent deterioration of the insulating panels and water accumulation which may provoke considerable roof overload problems. In certain roof constructions, the network of upper grooves is not necessary.

Claims19

Dependent claims

In a building roof draining system for a horizontal or slightly sloped flat roof including a heat-insulating layer formed of a plurality of heat-insulating panels joined side by side and having an upper and a lower face, an upper watertight membrane covering said layer, a lower fluid-tight membrane underlying said layer and an upper drain member sealed to and opening above the upper membrane for draining surface water from the roof, the improvement comprising a first water passage means located between said upper membrane and said layer, a second water passage means located between said layer and said lower membrane, and a third water passage means through said layer;

and a lower drain member sealed to and opening above the lower membrane and under said layer for draining from the roof water collected between the two membranes, said first, second and third water passage means and said lower drain member being in mutual communication.

Dependencies are inferred from the claim text.