Wind protection system and roof ballast module
A wind protection system, a roof ballast module, and a method for protecting a building from high winds are described. The wind protection system includes a plurality of roof ballast modules disposed across a rigid roof. The roof ballast modules may include several elongate liquid impermeable bladders. A valve permits filling the bladder with a liquid, such as water. Also, a method of protecting a building from high wind includes placing several water impermeable bladder panels on a rigid roof to ballast the roof.
The application claims priority to U.S. Provisional Patent Application No. 60/725,159 filed Oct. 11, 2005, which is expressly incorporated herein by reference.
FIELD OF THE INVENTIONThe present invention relates to apparatuses and methods to secure and protects buildings and rigid roofs from high winds, and more particularly to a wind protection system and a roof ballast module to protect a building from high winds, such as hurricane winds.
BACKGROUND OF THE INVENTIONStorm winds, such as hurricane winds, present a unique problem in the protection of buildings. Any breach in the walls, doors, windows, or the roof of a building can lead to a complete significant damage to a building. Maintaining the security of the roof is of particular importance in protecting a building from damage. Roof structures can be susceptible to at least three forces tending to separate a roof from a building. Wind forces may act under the eaves of a roof tending to separate the roof from the building at its point of attachment. If windows, doors, or any part of the walls of a building are compromised, wind entering the building will place an uncontrollable positive pressure inside the building and thus under the roof. Finally, the movement of high winds across the top of the roof creates a reduced pressure at the top surface of the roof due to Bernoulli's principle, thus tending to lift the roof off of the building. Once a roof is breached, the interior of a building is susceptible to a greater extent of damage from wind, debris, and water. Therefore, adequate building protection requires securing both the building and the roof from these forces.
In addition to these three forces, hurricane force winds present additional problems compared to other types of wind storms. First, hurricane winds are more turbulent and sustained than other wind storms. Hurricane winds can last hours at a time while permitting gusts that are 25%-50% higher than the maximum sustained winds. In a hurricane with sustained winds at 150 mph, gusts can exceed 200 mph. Also, hurricane winds generate a larger quantity of debris than other wind storms. The debris is carried by the strong winds, which multiply the potential damage that can be caused by the debris. For example, in a 100 mph wind, a 4 ft. by 8 ft. sheet of plywood could be thrown with up to 1100 lbs. of force. Thus, even the smallest debris increases the risk of compromise to the walls, doors, and windows of a building. If just small portions of the building walls, doors, or windows are compromised, the pressure inside the building (and thus against the underside of the roof) can quickly increase. Hurricane winds also change slowly in direction, which increases the probability that winds will achieve a critical angle of attack against a building or roof, thus maximizing the forces tending to remove the roof from the building. Ultimately, all of these factors contribute to a chain reaction compromising the building and the roof, possibly leading to the total destruction of the building.
Recent studies have demonstrated that fastening equipment and building protection could reduce the amount of property damage. In particular, the National Association of Homebuilders (NAHB) Research Center concluded that, in one observed hurricane, the use of fastening equipment could have reduced the loss of roof sheathing from 64% to 15% or less. Therefore, there is a need for systems and methods to protect buildings and roofs from wind damage in general, and more particularly hurricane wind damage.
SUMMARY OF THE INVENTIONA wind protection system, a roof ballast module, and a method for protecting a building from high winds are therefore provided. In one embodiment, the wind protection system includes a plurality of roof ballast modules disposed across a planar section of a rigid roof. The roof ballast modules have a plurality of elongate liquid impermeable bladders. The bladders have a port on one end permitting the interior of the bladder to be filled with a liquid, such as water. Channels may be provided between the bladders permitting fluid communication therebetween.
The wind protection system of one embodiment includes a protective shield to protect the building from airborne objects carried by high winds. At the upper end, the protective shield may be secured to roof ballast modules or to the building itself, for example extending from a fascia below the roof. At the lower end the protective shield may be secured to the ground by an anchor system or one or more anchors. The anchors may include ground screws, weighted bladders, and/or ground pillars, among other devices that may be used to secure the protective shield against high winds.
A roof ballast module according to one embodiment of the invention may include a plurality of elongate liquid impermeable bladders. The roof ballast module may include a first port on a top end of one of the bladders permitting the interior of the bladder to be filled with a liquid. An example of one type of port used in the invention may be a valve. Several channels may be provided between the bladders to permit fluid communication between the bladders.
Embodiments of the roof ballast module may include a drain valve disposed at the bottom end of a bladder. A second port may be disposed near the top end of another of the elongate bladders to permit fluid spillover from the interior of the bladder to another roof ballast module. In this way several roof ballast modules may be connected and filled through the spillover from the adjacent roof ballast modules.
According to one embodiment, the roof ballast modules and bladders may be formed from first and second panels sealed to one another along a common periphery. Additionally, grommets may be disposed about a periphery of the roof ballast modules for securing the roof ballast modules to one another or the roof. Furthermore, the ports may include threaded water hose connectors in order to facilitate connection to common water hose sources.
With respect to a method of protecting a building from high wind, one embodiment of the invention includes placing a plurality of water impermeable bladder panels on a rigid roof to ballast the roof. The impermeable bladders are filled with a liquid, such as water. Embodiments of the method may also include attaching a protective shield to a periphery of a building. The protective shield is anchored to the ground to secure the protective shield in place against high winds.
Therefore, a new wind protection system and roof ballast module is provided to more effectively protect a roof and a building from high winds, such as hurricane and other storm force winds. Generally, the roof ballasts may be filled with a liquid over a large area of the roof to add substantial mass to the roof. The added mass overcomes the lifting forces applied to the roof by high winds to maintain the integrity of roof and the building.
BRIEF DESCRIPTION OF THE DRAWINGSHaving thus described the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
The inventions now will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the inventions are shown. The inventions may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey embodiments within the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.
Referring now to
Returning to
The protective shield may comprise nylon, blended composites of nylon, rubber, plastic, carbon fiber, or natural materials such as high strength weaves of cotton, wool, jute, etc. One example of a protective shields for this purpose includes polypropylene netting having a mesh size of about ⅜th inch square. As the protective shield netting protects the exterior of a building, it may be desirable to employ UV stabilized material to avoid degradation from ultraviolet light. The protective shield 30 may have a series of protective panels 38 at places near windows, doors, etc.
In the example provided in
Additionally, the ballast modules may be used on sloping roofs (as shown in
When disposed on sloping rigid roofs 22, 24, the plurality of elongate bladders 54 may be disposed such that the axial length of the bladders proceeds from a higher elevation to a lower elevation on the roof. By doing this, the weight of the water mass in the interior of each bladder is distributed at different elevations to reduce the moment of inertia of water at the lower elevation of the bladders. For example, if the plurality of elongate bladders 54 were distributed horizontally, the moment of inertia would be higher due to a larger mass in a single bladder being at the at the lower elevation of the bladder. Thus the bladder would be more likely to rotate and roll the roof ballast modules down the roof. Distributing the bladders axially from a higher elevation to a lower elevation therefore redistributes the water mass to overcome the rolling effect, and is a preferred arrangement. However, other arrangements, including horizontal arrangements are also within the scope of the invention.
Other features of the roof ballast may include grommets 70 disposed about the periphery of the roof ballast module. Grommets permit securing the roof ballast modules to one another, or to the roof itself. For example, any or all of the adjacent modules shown in
Furthermore, each elongate bladder 54 may also include a drain valve 72 disposed at the lower end of the bladders. The drain valve 72 therefore permits gravity drain of water effluent when the roof ballasts are no longer needed for wind protection.
As is understood by those of ordinary skill in the art, there are numerous processes and methods by which to construct a bladder. For a flexible bladder, one particular method known to those of ordinary skill includes radio frequency (RF) sealing and heat sealing of thermoplastic sheets of liquid impermeable materials. Referring back to
In other embodiments, it may be desirable to use potable water as the liquid for filling the roof ballast modules so that adequate supplies of water remain after storms, hurricanes, etc., when regular water supplies may be limited. In this regard, materials that may be used can include thermoplastics that are approved by the Food and Drug Administration for contact with food substances. Other materials and embodiments of bladders and construction of liquid impermeable bladders are known and may be used, and these examples are given without limitation.
Some examples of valves for filling and draining the bladders may include valves with threaded fittings to attach to common household water hoses or other water supply systems. The valves may include plugs, ball valves, check valves, etc. (not shown), to permit filling and retaining water in modules. Additionally, the modules may support various attachments for ancillary uses of the water. For example, a shower head attachment can be provided to permit showering water after a storm in the event that regular water supplies are not available.
Referring now to
A wind protection system in accordance with an embodiment of the invention may be installed relatively simply by placing the unfilled ballast modules on the roof and, is desired, securing them together. Then, once in place on the roof, the ballast modules can be filled with water. Filling may be accomplished, for example, with regular water hoses. thus, the system can be installed at low weight and filled to the desired weight once in place.
Many modifications and other embodiments of the inventions will come to mind to one skilled in the art to which these inventions pertain, having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims
1. A wind protection system comprising:
- a plurality of roof ballast modules adapted to be disposed on a rigid roof, each roof ballast module comprising: a plurality of liquid impermeable bladders, the bladders defining an interior and an exterior; a first port on at least one of the bladders permitting the interior of the bladder to be filled with a liquid; and at least one channel permitting fluid communication between the plurality of bladders.
2. The wind protection system according to claim 1, further comprising:
- a protective shield extending from adjacent the roof to adjacent the ground; and
- an anchor system to secure the protective shield to the ground.
3. The wind protection system according to claim 2, the anchor system comprising at least one bladder filled with liquid.
4. The wind protection system according to claim 2, the anchor system comprising at least one ground pillar.
5. The wind protection system according to claim 2, the anchor system comprising at least one ground screw.
6. The wind protection system according to claim 1, wherein the roof ballast modules further comprise a drain valve.
7. The wind protection system according to claim 1, wherein the roof ballast modules further comprise a second port disposed on at least one of the plurality of bladders, the second port permitting the liquid to spillover from the interior to the exterior of the plurality of bladders.
8. The wind protection system according to claim 1, the bladders being formed from first panel and a second panel sealed together to define the interior and exterior of the bladders.
9. The wind protection system according to claim 1, wherein the roof ballast modules further comprise grommets disposed about a periphery of the roof ballast modules.
10. The wind protection system according to claim 1, the first port further comprising a threaded water hose connector.
11. The wind protection system according to claim 1, wherein the first port comprises a valve.
12. A roof ballast module comprising:
- a plurality of liquid impermeable bladders, the bladders defining an interior and an exterior;
- a first port on one of the bladders permitting the interior of the bladder to be filled with a liquid; and
- at least one channel permitting fluid communication between the interiors of plurality of the plurality of elongate bladders.
13. The roof ballast module of claim 12, further comprising a drain valve disposed on at least one of the plurality of bladders.
14. The roof ballast module of claim 12, wherein each of the plurality of bladders is elongate such that the plurality of elongate bladders comprise being disposed parallel to one another.
15. The roof ballast module of claim 12, further comprising a second port permitting the liquid to spillover from the interior to the exterior of the plurality of bladders.
16. The roof ballast module of claim 12, the bladders being formed from a first panel and a spaced second panel; the first panel and the second panel being sealed to one another along a common periphery to define the interior between the first panel and the second panel.
17. The roof ballast module of claim 12, further comprising grommets disposed about a periphery of the roof ballast module.
18. The roof ballast module of claim 12, the first valve further comprising a threaded water hose connector.
19. The roof ballast module of claim 12, wherein the first port comprises a valve.
20. A method of protecting a building from high winds comprising:
- placing a plurality of liquid impermeable bladder modules on a rigid roof; and
- filling the liquid impermeable bladder modules with a liquid.
21. The method according to claim 20, further comprising, connecting several of the plurality of bladder modules together so that one of the bladder modules receives a liquid spillover from another one of the connected bladder modules.
22. The method according to claim 20, further comprising:
- attaching a protective shield adjacent the roof of the building; and
- anchoring the protective shield to the ground to secure the protective shield in place against high winds.
23. The method according to claim 20, wherein the step of placing a plurality of liquid impermeable bladders on a rigid roof further comprises placing elongate liquid impermeable bladders on a sloping roof such that the longitudinal axis of the liquid impermeable bladders is distributed from a higher elevation on the roof to a lower elevation on the roof.
24. A wind protection system comprising:
- a plurality of roof ballast modules adapted to be disposed on a rigid roof, each roof ballast module comprising: at least one liquid impermeable bladder, the bladder defining an interior and an exterior; a first port on at least one of the bladders permitting the interior of the bladder to be filled with a liquid; a second port on at least one of the bladders permitting liquid to spillover from the interior of the bladder;
- wherein at least two of the plurality of roof ballast modules are connected from a first module's second port to a second module's first port to permit filling the second modules by the liquid spillover from the first module.
25. The wind protection system according to claim 24, the bladders being formed from first panel and a second panel sealed together to define the interior and exterior of the bladders.
26. The wind protection system according to claim 24, wherein the roof ballast modules further comprise grommets disposed about a periphery of the roof ballast modules.
27. The wind protection system according to claim 24, the first port and second port each further comprise a threaded water hose connector.
28. The wind protection system according to claim 24, wherein the first port and second port each comprises a valve.
Type: Application
Filed: Sep 21, 2006
Publication Date: May 3, 2007
Inventor: Charles Hess (Tulsa, OK)
Application Number: 11/524,473
International Classification: E04B 5/00 (20060101);