Poured Concrete

Figure No. 1005

Drain set in poured roof deck slab. Flashing is secured by a non-puncturing flashing clamp.

Precast Deck

Figure No. 1005 (-C)

Drain with underdeck clamp -C used where roof drain openings are presleeved or sawed-out in the slab. Underdeck clamp provides positive anchoring of the drain body. May be used in any slab or deck. NOTE: Drain flange rests in a recessed portion of the deck, eliminating sump receiver.

Any Insulated Deck

Figure No. 1005 (-R-C)

Drain with sump receiver -R and underdeck clamp -C. Under deck clamp provides positive anchoring of the drain body. The sump receiver is a square metal plate that accepts the drain body flange and eliminates the puddle of water surrounding the roof drain.

Gutter Drain Installation

Figure No. 1605T

Gutter drain set in poured roof deck slab. Flashing is secured by a non-puncturing flashing clamp. For more on installations, click here for Technical Data in our Roof Drains Section.

Although any building or structure can benefit from siphonic roof drainage, siphonic systems are especially ideal for low-rise buildings with large footprints such as:

•  Airport Terminals   •  Aircraft Hangers  •  Covered Malls
•  Office Complexes  •  Warehouses  •  Convention Centers
•  Factories  •  Train Stations  •  Retail  •  Distribution Centers
 

Siphonic Roof Drainage for Building Retrofits 

Building renovations typically involve the replacement of the roof waterproofing system and roof drains. The replacement of roof drains may also require the replacement of the drainage piping. Depending on the age of the building being renovated, an upgrade to current building codes may be required and these codes may require roof drains and piping sized for higher rainfall intensity and the use of independent secondary (i.e. emergency) overflow systems.

With smaller pipe diameters and no pitch, siphonic roof drainage is ideal for building retrofits, especially where architectural preservation is desired. Not only can it accommodate tight ceiling spaces and limited chase and wall space, it reduces construction costs. It also makes it possible to install all the new piping overhead (in ceilings) thereby eliminating the need to saw cut existing floor slabs to excavate and replace buried piping.

In the context of the LEED™ rating system, siphonic roof drainage contributes to the reduction in materials used by allowing for smaller piping. And it facilitates the achievement of LEED™ credits for the reuse of existing buildings. Siphonic roof drainage is also useful for the replacement of exterior downspouts particularly along facades that must be preserved due to historic value.

Siphonic roof drainage is environmentally friendly, enables historic preservation, is easier to install, and saves money that can be used on other renovation efforts.