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Ballasted storm water retention system

a technology of storm water and ballasted roof, which is applied in the direction of roof covering, roofs, constructions, etc., can solve the problems of large excess water can exceed the capacity of storm sewer systems, and the cost of drainage systems can be relatively high, so as to reduce the burden on sewage systems from storm runoff from flat roofs

Inactive Publication Date: 2009-07-30
CARLISLE INTANGIBLE LLC
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AI Technical Summary

Benefits of technology

[0005]The present invention is premised on the realization that storm water runoff from a flat roof can be reduced utilizing a ballasted storm water retention roof system. The storm water retention roof system incorporates a water impervious roofing membrane as the water barrier for the roof. This membrane may be covered with a drainage board in turn covered with a water retention mat. The drainage board and mat are held in position with a ballast layer such as gravel.

Problems solved by technology

Storm runoff presents a significant burden to sewage systems.
Excess water can exceed the capacity of the storm sewer system.
Such drainage systems can be relatively expensive, particularly as their volume increases.
Unfortunately, garden roofs are in many applications cost prohibitive.
Further, the maintenance costs of a garden roof must also be considered.

Method used

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Embodiment Construction

[0010]As shown in FIG. 1, the present invention is a roof structure 10 that incorporates a roof deck 12 covered with a water barrier layer 14. The roof structure 10 is a flat roof, meaning the slope of the roof is less than about 1 inch per foot. Generally, the slope is about 0.25 inch / foot. As shown, the water barrier layer 14 is a polymeric membrane, although any water barrier layer that is suitable for a flat roof surface can be used in the present invention. Suitable polymeric membranes include EPDM, TPO and polyvinylchloride. These are commonly used on flat roof surfaces. The water barrier layer 14 can be installed in any typical manner. For example, the membrane can be simply loose-laid, held with mechanical fasteners, or fastened with an adhesive.

[0011]Between the roof deck 12 and the membrane 14 can be various layers, as is well known. Typically, one may employ an insulation layer 15 between the roof deck and the membrane.

[0012]Covering the membrane 14 is an optional, protec...

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Abstract

A roof system designed to retain water during storms and release it slowly over a period of time includes a polymeric water impervious membrane covered with a drainage board in turn covered with a water retention mat. The water retention mat and drainage board are held in position by ballast, preferably gravel. The mat is designed to retain at least about 25% of a one-inch per hour rainfall and release it gradually over 2 to 3 hours, thereby reducing rain runoff during storms and reducing the load on a storm sewer system

Description

RELATED APPLICATION[0001]This application is related to and claims the benefit of U.S. Provisional Patent Application Ser. No. 61 / 023,257, filed Jan. 24, 2008, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Storm runoff presents a significant burden to sewage systems. Excess water can exceed the capacity of the storm sewer system. Drainage systems that include holding ponds can be used to temporarily retain water and slowly feed this to sewer systems. Such drainage systems can be relatively expensive, particularly as their volume increases.[0003]One way to reduce the storm runoff is to temporarily retain water on a roof using a garden roof. The garden roof incorporates a growth medium layer, which supports plant growth and also acts to retain water. Thus, during a storm, the growth medium absorbs water and gradually allows some of the water to run off the roof. This slows the storm runoff, allowing the storm sewer system to handle the wa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04D13/00
CPCE04D13/0477E04D11/00
Inventor DUCHARME, MICHAEL J.FULLER, BRANDON M.
Owner CARLISLE INTANGIBLE LLC
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