Roof Drain Recession Plate

Abstract

One embodiment of a recessed roof drain support (recession plate) is to be mounted under structural roof sheathing at the location of a roof deck penetration for a roof drain body. The roof drain body mounting flange, when mounted to the recession plate, will be below the surface of the roof sheathing, creating a recess for a roofing membrane to flow smoothly into the clamping surface of the roof drain body, leaving no opportunity for water to stand.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]None.FEDERALLY SPONSORED RESEARCH[0002]NoneSEQUENCE LISTING[0003]NoneTECHNICAL FIELD[0004]This invention relates to roof drain apparatus in general, and more specifically to a supporting plate for mounting a commercial roof drain assembly, permitting the drain to be positioned beneath the level of the roof sheathing for optimum drainage.BACKGROUND[0005]A flat or nearly level roof is very common on large multi-occupancy and commercial buildings. In some situations the roof sheathing is plywood or structural material that in turn is covered by an impermeable roofing membrane. Because of the minimal slope on such roofs, roofers must install a sufficient number of drains penetrating the roof sheathing and the membrane that covers the roof. Most commercial roof drain assemblies have an outer flange to mount the drain assembly above the roof sheathing and an under-deck clamp to secure the drain body. A watertight seal is accomplished when the m...

AI Technical Summary

Benefits of technology

This invention is a support for a roof drain assembly for flat roofs that helps to prevent water damage to the roof. It was designed using a recessed mounting plate that is attached to the roof deck using plywood. This plate prevents the drain from deforming the roof membrane and allows water to flow gently into the drain. The invention is affordable, easy to install, and can be modified on the go.

Problems solved by technology

Even a small amount of standing water left after a rain can deteriorate the roof membrane around the drain and this often leads to leaks and structural failure.

Standing water often freezes and damage can occur with the expansion of ice.

Prior art has not adequately addressed the problem of standing water.

Because these designs mount above the roof deck, none have successfully solved the problem of rainwater damming up around the edges of the drain.

This still leaves a shallow rise in the roof membrane surrounding the sump, additionally, the apparatus requires commercial fabrication involving either sheet metal presses or the welding and plating of multiple pieces of sheet metal to form a roof drain sump box.

Field fabrication or modification would be cost prohibitive.

Whether applied to wooden or concrete decks, three features may lead to failure of the roof integrity.1. The roof drain is surrounded by a sheet metal apron sandwiching the roof membrane between it and the roof sheathing.

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