Commercial Roof Drains

Q. "What is Dura Coat?"
A. Dura coat is a specially formulated paint designed to resist cracking and chipping. Dura Coat is a latex based coating developed to be used with cast iron substrate.

Q. "What does No-Hub mean?"
A. No-Hub is the most widely used connection. It is achieved by butting No-Hub soil pipe or plastic pipe to the bottom of drain and securing it with a No-Hub joint clamp.

Q. "What is the difference between No-Hub and Push-on?"
A. No-Hub is secured by using a No-Hub coupling, and push-on has a gasket in the drain that goes over the pipe connection.

Q. "Do you offer any floor drains?"
A. Yes. We offer a variety of floor drains here.

Q. "What is an external water dam?"
A. Sometimes roofs are designed to contain a predetermined depth of water at all times for various reasons. Roof drains for installation in these types of roofs should be equipped with a water dam (watertight open top collar either internal or external of the dome), with its flood level at the prescribed elevation above deck to serve as a dam to retain the desired amount of water on the roof. Excess water floods over the dam and is discharged into the roof drainage system.

Q. "What does the sump receiver do?"
A. Sump receivers, sometimes called drain receivers, should be used with roof drains to compensate for deck opening irregularities and provide proper support for the drain. The sump receiver is a flat steel plate with a depressed center opening into which the roof drain body flange fits, the sump receiver is supported by the lip of the opening in the deck. In addition to easing the deck opening tolerance requirements, the sump receiver distributes the weight of the drain over a larger surface of the deck.

Q. "How does the underdeck clamp work?"
A.The underdeck clap is designed to be used in conjunction with the sump receiver. With the drain and sump receiver in place, the circular underdeck clamp is drawn tightly in place with hardware provided. This in effect sandwiches the sump receiver between the drain and the clamp.

Q. "What is the purpose of the threaded extension kit?"
A.The threaded extension is placed on the structural deck level to accommodate various thickness of insulation, thereby avoiding the necessity of tapering or feathering the insulation layer down to the fixed body flange level of the drain causing a loss of insulation value at the drain location.