The present invention generally relates to anchoring systems for insulated cavity walls, and more specifically, a thermal veneer tie that creates a thermal break in a cavity wall.
Anchoring systems for cavity walls are used to secure veneer facings to a building and overcome seismic and other forces (e.g., wind shear, etc.). Anchoring systems generally form a conductive bridge or thermal pathway between the cavity and the interior of the building through metal-to-metal contact. Optimizing the thermal characteristics of cavity wall construction is important to ensure minimized heat transfer through the walls, both for comfort and for energy efficiency of heating and air conditioning. When the exterior is cold relative to the interior of a heated structure, heat from the interior should be prevented from passing through to the outside. Similarly, when the exterior is hot relative to the interior of an air conditioned structure, heat from the exterior should be prevented from passing through to the interior. The main cause of thermal transfer is the use of anchoring systems made largely of metal components (e.g., steel, wire formatives, metal plate components, etc.) that are thermally conductive. While providing the required high-strength within the cavity wall system, the use of metal components results in heat transfer. Failure to isolate the metal components of the anchoring system and break the thermal transfer results in heating and cooling losses and in potentially damaging condensation buildup within the cavity wall structure. However, a completely thermally-nonconductive anchoring system is not ideal because of the relative structural weakness of nonconductive materials.
In one aspect, a veneer tie for use in a cavity wall to connect to a wall anchor to join an inner wythe and an outer wythe of the cavity wall includes an insertion portion configured for disposition in a bed joint of the outer wythe. A cavity portion is contiguous with the insertion portion, and a pintle is contiguous with the cavity portion and configured for attachment to a receptor of the wall anchor. A thermal coating is disposed on the pintle, the thermal coating being configured and arranged to reduce thermal transfer in the cavity wall between the veneer tie and the wall anchor when attached to the pintle.
In another aspect, an anchoring system for use in a cavity wall to join an inner wythe and an outer wythe of the cavity wall includes a wall anchor configured for attachment to the inner wythe, the wall anchor having at least one receptor. A veneer tie includes an insertion portion configured for disposition in a bed joint of the outer wythe and a cavity portion contiguous with the insertion portion. A pintle is contiguous with the cavity portion and configured for reception in the receptor of the wall anchor. A thermal coating is disposed on the pintle, the thermal coating being configured and arranged to reduce thermal transfer in the cavity wall between the veneer tie and the wall anchor when attached to the pintle.
Other objects and features will be in part apparent and in part pointed out hereinafter.
Corresponding reference characters indicate corresponding parts throughout the drawings.
Referring to
Successive bed joints 26 and 28 are formed between courses of blocks 16 and are substantially planar and horizontally disposed. In addition, successive bed joints 30 and 32 are formed between courses of bricks 20 and are substantially planar and horizontally disposed. In accordance with building standards, the bed joints are approximately 0.375 inches (0.9525 cm) in height in a typical embodiment. Selective ones of bed joints 26, 28 receive a wall reinforcement 46. Selective ones of bed joints 30 and 32 receive the insertion portion of a veneer tie 44. A wall anchor 40 extends into the cavity 22 and is attached to the wall reinforcement 46 in a suitable manner, such as by welding. It is also contemplated that the wall anchor could be formed as one piece with the reinforcement. It is understood that the described and illustrated wall structure 12 is exemplary only. Other structures may be used without departing from the scope of the present invention. As described in greater detail below, the veneer tie 44 is configured to provide a thermal break in the cavity 22. The anchoring system 10 is constructed and configured to limit thermal transfer between the wall anchor 40 and the veneer tie 44.
For purposes of the description, an exterior cavity surface 24 of the inner wythe 14 contains a horizontal line or x-axis 34 and an intersecting vertical line or y-axis 36. A horizontal line or z-axis 38, normal to the xy-plane, passes through the coordinate origin formed by the intersecting x- and y-axes.
The wall reinforcement 46 includes parallel side wire members 48, 50 and intermediate wires 52 extending between the side wires. As illustrated in
Veneer tie 44 is shown in
The veneer tie 44 includes a thermal coating that is configured to provide a thermal break in the cavity 22. The main components of the veneer tie are preferably made of metal (e.g., steel) to provide a high-strength anchoring system. Through the use of a thermal coating, the underlying metal components of the veneer tie obtain a lower thermal conductive value (K-value), thereby providing a high strength veneer tie with the benefits of thermal isolation. Likewise, the entire cavity wall 12 obtains a lower transmission value (U-value), thereby providing an anchoring system with the benefits of thermal isolation. The term K-value is used to describe the measure of heat conductivity of a particular material, i.e., the measure of the amount of heat, in BTUs per hour, that will be transmitted through one square foot of material that is one inch thick to cause a temperature change of one degree Fahrenheit from one side of the material to the other (BTU/(hr·ft·° F.); or W/(m·K) in SI units). The lower the K-value, the better the performance of the material as an insulator. The metal components of the anchoring systems generally have a K-value range of 16 to 116 W/(m·K) (about 9 to 67 BTU/(hr·ft·° F.)). The coated veneer tie as described below greatly reduces the K-values to a low thermal conductive K-value not to exceed 1 W/(m·K) (about 0.58 BTU/(hr·ft·° F.)), for example about 0.7 W/(m·K) (about 0.4 BTU/(hr·ft·° F.)). The term U-value is used to describe the transmission of heat through the entire cavity wall (including the veneer tie, the anchor, the insulation, and other components), i.e., the measure of the rate of transfer of heat through one square meter of a structure divided by the difference in temperature across the structure. Similar to the K-value, the lower the U-value, the better the thermal integrity of the cavity wall, and the higher the U-value, the worse the thermal performance of the building envelope. The U-value is calculated from the reciprocal of the combined thermal resistances of the materials in the cavity wall, taking into account the effect of thermal bridges, air gaps and fixings. Several factors affect the U-value, such as the size of the cavity, the thickness of the insulation, the materials used, etc. Desirably, the use of veneer ties as described herein may reduce the U-value of a wall by 5%-80%.
The pintles 62, 64 (i.e., the portion of the veneer tie 44 that contacts the wall anchor 40) are coated with a thermal coating to provide a thermal break in the cavity (
The thermal coating reduces the K-value of the underlying metal components which include, but are not limited to, mill galvanized, hot galvanized, and stainless steel. Such components have K-values that range from 16 to 116 W/(m·K). The thermal coating reduces the K-value of the veneer tie to not exceed 1.0 W/(m·K). Likewise, the thermal veneer tie reduces the U-value of the cavity wall structure. Preferably, the U-value of the cavity wall structure including the thermal veneer tie is reduced by 5-80% as compared to the U-value of the cavity wall structure including a veneer tie without the thermal coating described herein. The thermal coating is fire resistant and gives off no toxic smoke in the event of a fire. Furthermore, the coating is suited to the application in an anchoring system with characteristics such as shock resistance, non-frangibility, low thermal conductivity and transmissivity, and a non-porous resilient finish. Additionally, the thermal coating can provide corrosion protection which protects against deterioration of the anchoring system over time.
The thermal coating can be applied through any number of methods including fluidized bed production, thermal spraying, hot dip processing, heat-assisted fluid coating, or extrusion, and includes both powder and fluid coating to form a reasonably uniform coating. The coating preferably has a thickness selected to provide a thermal break in the cavity. In one embodiment, the thickness of the coating is at least about 3 microns, such as a thickness in the range of approximately 3 microns to approximately 300 microns, and in one embodiment is about 127 microns. The thermal coating is cured to achieve good cross-linking of the layers. Appropriate examples of the nature of the coating and application process are set forth in U.S. Pat. Nos. 6,284,311 and 6,612,343.
Optionally, the wall anchor 40 can also include a thermal coating as described above. All or a portion of the wall anchor 40 and the wall reinforcement 46 can be coated to provide a thermal break in the cavity wall structure. In one embodiment, the receptor portions 58 (i.e., the portion of the wall anchor 40 that contacts the veneer tie 44) include a thermal coating (shown by stippling on the wall anchor in
Referring to
Successive bed joints 130 and 132 are formed between courses of bricks 120 and are substantially planar and horizontally disposed. In accordance with building standards, the bed joints are approximately 0.375 inches (0.9525 cm) in height in a typical embodiment. Selective ones of bed joints 130 and 132 receive the insertion portion of a veneer tie 144. A wall anchor 140 is threadedly mounted on the inner wythe 114 and is supported by the inner wythe. It is understood that the described and illustrated wall structure 112 is exemplary only. Other structures may be used without departing from the scope of the present invention. As described in greater detail below, the veneer tie 144 is configured to provide a thermal break in the cavity 122. The anchoring system 110 is constructed and configured to limit thermal transfer between the wall anchor 140 and the veneer tie 144.
For purposes of the description, an exterior cavity surface 124 of the inner wythe 114 contains a horizontal line or x-axis 134 and an intersecting vertical line or y-axis 136. A horizontal line or z-axis 138, normal to the xy-plane, passes through the coordinate origin formed by the intersecting x- and y-axes.
In the illustrated embodiment, the anchoring system 110 includes wall anchor 140, veneer tie 144, and an optional wire or outer wythe reinforcement 146. At intervals along the exterior surface 124 of the inner wythe 114, wall anchors 140 are driven into place in anchor-receiving channels 148 (see
Veneer tie 144 is shown in
The veneer tie 144 includes a thermal coating that is configured to provide a thermal break in the cavity 122. The main components of the veneer tie are preferably made of metal (e.g., steel) to provide a high-strength anchoring system. Through the use of a thermal coating, the underlying metal components of the veneer tie obtain a lower thermal conductive value (K-value), thereby providing a high strength veneer tie with the benefits of thermal isolation. Likewise, the entire cavity wall 112 obtains a lower transmission value (U-value), thereby providing an anchoring system with the benefits of thermal isolation. The pintles 162, 164 (i.e., the portion of the veneer tie 144 that contacts the wall anchor 140) are coated with a thermal coating to provide a thermal break in the cavity. The coating is illustrated by stippling in
The thermal coating reduces the K-value of the underlying metal components which include, but are not limited to, mill galvanized, hot galvanized, and stainless steel. Such components have K-values that range from 16 to 116 W/(m·K). The thermal coating reduces the K-value of the veneer tie to not exceed 1.0 W/(m·K). Likewise, the thermal veneer tie reduces the U-value of the cavity wall structure. Preferably, the U-value of the cavity wall structure including the thermal veneer tie is reduced by 5-80% as compared to the U-value of the cavity wall structure including a veneer tie without the thermal coating described herein. The thermal coating is fire resistant and gives off no toxic smoke in the event of a fire. Furthermore, the coating is suited to the application in an anchoring system with characteristics such as shock resistance, non-frangibility, low thermal conductivity and transmissivity, and a non-porous resilient finish. Additionally, the thermal coating can provide corrosion protection which protects against deterioration of the anchoring system over time.
The thermal coating can be applied through any number of methods including fluidized bed production, thermal spraying, hot dip processing, heat-assisted fluid coating, or extrusion, and includes both powder and fluid coating to form a reasonably uniform coating. The coating preferably has a thickness selected to provide a thermal break in the cavity. In one embodiment, the thickness of the coating is at least about 3 microns, such as a thickness in the range of approximately 3 microns to approximately 300 microns, and in one embodiment is about 127 microns. The thermal coating is cured to achieve good cross-linking of the layers. Appropriate examples of the nature of the coating and application process are set forth in U.S. Pat. Nos. 6,284,311 and 6,612,343.
Optionally, the wall anchor 140 can also include a thermal coating as described above (not shown). All or a portion of the wall anchor 140 can be coated to provide a thermal break in the cavity wall structure. In one embodiment, walls of the apertures 155, 157 (i.e., the portion of the wall anchor 140 that contacts the veneer tie 144) include a thermal coating. In another embodiment, the entire wing nut 153 includes a thermal coating. In another embodiment, the entire wall anchor except for the threaded portion 156 includes a thermal coating.
Referring now to
Successive bed joints are formed between courses of bricks 220 and are substantially planar and horizontally disposed. In accordance with building standards, the bed joints are approximately 0.375 inches (0.9525 cm) in height in a typical embodiment. Selective ones of bed joints are constructed to receive the insertion portion of a veneer tie 244. A wall anchor 240 is surface-mounted on the inner wythe 214 and is supported by the inner wythe. It is understood that the described and illustrated wall structure 212 is exemplary only. Other structures may be used without departing from the scope of the present invention. As described in greater detail below, the veneer tie 244 is configured to provide a thermal break in the cavity 222. The anchoring system 210 is constructed and configured to limit thermal transfer between the wall anchor 240 and the veneer tie 244.
For purposes of the description, an exterior cavity surface 224 of the inner wythe 214 contains a horizontal line or x-axis 234 and an intersecting vertical line or y-axis 236. A horizontal line or z-axis 238, normal to the xy-plane, passes through the coordinate origin formed by the intersecting x- and y-axes.
At intervals along the inner wythe 214, wall anchors 240 are mounted and extend into the cavity 222. Each wall anchor 240 includes a receptor portion for receiving the veneer tie 244. As seen in
The veneer tie 244 is formed of wire and includes attachment portions or pintles 262, 264, cavity portions 266, 268, and insertion portion 270, which is received in a bed joint of the outer wythe 218. The pintles 262, 264 are received in the receptor portions 250 of the wall anchor 240 to secure the veneer tie to the wall anchor. The pintles 262, 264 can be compressively reduced such that each pintle has a thickness extending along an x-vector, and a width extending along a z-vector, the width being greater than the thickness. Optionally, the insertion portion 270 can be compressively reduced in height (not shown). It is understood that neither the pintles nor the insertion portion need be compressively reduced within the scope of the present invention. As illustrated, the veneer tie 244 is configured to receive a wire reinforcement 271. The insertion portion 270 of the veneer tie 244 includes swaged areas 274 for receiving the reinforcement 271.
The veneer tie 244 includes a thermal coating that is configured to provide a thermal break in the cavity 222. The main components of the veneer tie are preferably made of metal (e.g., steel) to provide a high-strength anchoring system. Through the use of a thermal coating, the underlying metal components of the veneer tie obtain a lower thermal conductive value (K-value), thereby providing a high strength veneer tie with the benefits of thermal isolation. Likewise, the entire cavity wall 212 obtains a lower transmission value (U-value), thereby providing an anchoring system with the benefits of thermal isolation. The pintles 262, 264 (i.e., the portion of the veneer tie 244 that contacts the wall anchor 240) are coated with a thermal coating to provide a thermal break in the cavity (
The thermal coating reduces the K-value of the underlying metal components which include, but are not limited to, mill galvanized, hot galvanized, and stainless steel. Such components have K-values that range from 16 to 116 W/(m·K). The thermal coating reduces the K-value of the veneer tie to not exceed 1.0 W/(m·K). Likewise, the thermal veneer tie reduces the U-value of the cavity wall structure. Preferably, the U-value of the cavity wall structure including the thermal veneer tie is reduced by 5-80% as compared to the U-value of the cavity wall structure including a veneer tie without the thermal coating described herein. The thermal coating is fire resistant and gives off no toxic smoke in the event of a fire. Furthermore, the coating is suited to the application in an anchoring system with characteristics such as shock resistance, non-frangibility, low thermal conductivity and transmissivity, and a non-porous resilient finish. Additionally, the thermal coating can provide corrosion protection which protects against deterioration of the anchoring system over time.
The thermal coating can be applied through any number of methods including fluidized bed production, thermal spraying, hot dip processing, heat-assisted fluid coating, or extrusion, and includes both powder and fluid coating to form a reasonably uniform coating. The coating preferably has a thickness selected to provide a thermal break in the cavity. In one embodiment, the thickness of the coating is at least about 3 microns, such as a thickness in the range of approximately 3 microns to approximately 300 microns, and in one embodiment is about 127 microns. The thermal coating is cured to achieve good cross-linking of the layers. Appropriate examples of the nature of the coating and application process are set forth in U.S. Pat. Nos. 6,284,311 and 6,612,343.
Optionally, the wall anchor 240 can also include a thermal coating (not shown) as described above. All or a portion of the wall anchor 240 can be coated to provide a thermal break in the cavity wall structure. In one embodiment, the receptor portions 250 (i.e., the portion of the wall anchor 240 that contacts the veneer tie 244) include a thermal coating (not shown). In another embodiment, the free end portions 248 of the wall anchor 240 include a thermal coating (not shown). In another embodiment, the wall base plate member 246 includes a thermal coating (not shown).
The veneer ties as described above serve to thermally isolate the components of the anchoring system, thereby reducing the thermal transmission and conductivity values of the anchoring system as a whole. The veneer ties provide an insulating effect and an in-cavity thermal break, severing the thermal pathways created from metal-to-metal contact of anchoring system components. Through the use of the thermally-isolating veneer ties, the underlying metal components obtain a lower thermal conductive value (K-value), thereby reducing the thermal transmission value (U-value) of the entire cavity wall structure. The present invention maintains the strength of the metal and further provides the benefits of a thermal break in the cavity.
Having described the invention in detail, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.
When introducing elements of the present invention or the preferred embodiment(s) thereof, the articles “a”, “an”, “the” and “said” are intended to mean that there are one or more of the elements. The terms “comprising”, “including” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.
As various changes could be made in the above products without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
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