A sealing assembly for fluidly sealing a roof drain within a conductor pipe has a sealing element and an expansion ring. The sealing element defines an inner wall with a portion that transitions inward and may be disposed on a portion of the roof drain. The expansion ring is disposed within the inner wall. Reciprocation of the of the expansion ring along the inward transitioning portion of the inner wall causes the sealing element to expand outwardly to a sealed position with the sealing element outer wall abutting the conductor pipe inner wall in a fluid tight seal. Opposite reciprocation of the ring allows the sealing element to contract and release from the conductor pipe.

The drainage system is for flat surfaces, especially roofs, terraces, baths, car parks, designed for drainage of water or other liquids from the area of the surface. The drainage system includes at least one rectangular plate, the lower surface of which is substantially flat and the upper surface is non-flat. At points on the upper surface, the inclination of at least a part of the upper surface is smoothly variable.

A seal assembly, including a first conduit member having a first seat and a second conduit member having a second seat. The second conduit member is coupled to the first conduit member such that the first and second conduit members are movable between at least a rest configuration in which the first and second seats are a rest distance apart, and a compressed configuration in which the first and second seats are held at a compressed distance apart. The compressed distance is less than the rest distance. The seal assembly also includes a flexible seal received between the first and second seats such that the flexible seal is compressed when the first and second conduit members are in the compressed configuration, the flexible seal expanding axially outwards when compressed to engage with an inner surface of a body in which the seal assembly is received.

A seal assembly, including a first conduit member having a first seat and a second conduit member having a second seat. The second conduit member is coupled to the first conduit member such that the first and second conduit members are moveable between at least a rest configuration in which the first and second seats are a rest distance apart, and a compressed configuration in which the first and second seats are held at a compressed distance apart. The compressed distance is less than the rest distance. The seal assembly also includes a flexible seal received between the first and second seats such that the flexible seal is compressed when the first and second conduit members are in the compressed configuration, the flexible seal expanding axially outwards when compressed to engage with an inner surface of a body in which the seal assembly is received.

There is described a drainage structure for collecting and removing liquid from an area, the drainage structure comprising: a catchment reservoir; an outlet; an outlet orifice located at an interface of the catchment reservoir and the outlet, wherein the outlet orifice enables liquid to flow between the catchment reservoir and the outlet; and an outlet orifice surface arranged adjacent the outlet orifice, the outlet orifice surface comprising at least one protrusion which protrudes into the catchment reservoir and/or the outlet.

A roof drain assembly includes a drain body, a gravel guard, and a cover. The drain body includes an inlet, an outlet, and a conduit between said inlet and outlet. The gravel guard includes a frame having a top opening, a bottom opening, a plurality of castellations separated from each other by a plurality of gaps. The gravel guard may be removably coupled to the drain body or integral with the drain body. The cover is configured to be removably coupled to a top surface of the gravel guard (e.g., at least a portion of the plurality of castellations). The cover includes a plurality of openings configured to allow fluid to flow therethrough into the drain body.

In an exemplary embodiment, a system for releasing stormwater on a rooftop of a building structure includes at least one drain water retention device including a float control device to measure volumetric stormwater retained in the rooftop and a valve to operatively open a drain when the measured volumetric stormwater is exceeded, at least one leak detection device configured to detect a water leak, located under an underlying surface of the rooftop, the at least one leak detection device detects the leak in response to change in relative humidity levels or dew point under the underlying surface of the rooftop, and a controller, executing control instructions, in communication with the at least one drain water retention device for selectively controlling the valve in accordance with the control instructions, the controller includes a storage associated with the controller for storing the control instructions. The control instructions are performed according to the steps of measuring the volumetric stormwater retained in the rooftop, determining a duration of time of stormwater retained in the rooftop, determining a location of the building structure to provide prior estimated precipitation and atmospheric conditions, defining a predefined allowable tolerance, and comparing the measured volumetric stormwater with the predefined allowable tolerance and, if the measured volumetric stormwater exceeds the predefined allowable tolerance, opening the drain to remove the stormwater.

A roof snow melt system includes a drip edge cover having a drip edge cable platform and a drip edge S-bend; a first plate having a plate attachment strip insertable into the drip edge S-bend and a plate cable containment lip, the plate cable containment lip and drip edge cable platform to house a length of heat cable; a first valley end cap couplable to the at least one plate, the first valley end cap comprising an insertion lip formed at a valley cap C-shaped bend; and a valley plate to be coupled to a valley of a roof, the valley plate having a valley plate C-bend to receive the insertion lip of the first valley end cap to couple the valley end cap to the valley plate wherein the valley plate includes at least one valley plate containment lip to receive the length of heat cable.

A roof drain including a base defining a channel and an axis, a gravel guard coupled to the base and including a plurality of teeth, where the gravel guard defines a plurality of gullets between the teeth, and a dome coupled to the base, where the dome includes a plurality of ribs, where the ribs define a plurality of gaps therebetween, and where each gap is radially aligned with a corresponding gullet.

A roof drain system. The roof drain system includes a roof system, the roof system including a structural deck and a water impermeable membrane in a spaced apart relationship and together defining a drain opening. The upper drain member can be joined to the water impermeable membrane, the upper member having a lower portion disposed in the drain opening. The lower drain member can be joined to the structural deck, the lower drain member being disposed in the drain opening and having an upper portion disposed inside the lower portion of the upper drain member in a spaced apart relationship to define a drain gap.