The present invention relates to steel framing components, and more particularly to steel framing components for supporting rigid insulation installed on primary structural framing in both light gauge steel and wood framing applications.
Walls of buildings may include framing made of light gauge steel, wood, or a combination thereof. In addition to structural requirements that the framing must meet, thermal characteristics are important, especially for exterior walls. Minimizing heat transfer through the walls is desirable both for comfort and for energy efficiency of heating and air conditioning. For example, when the outdoors is cold relative to inside a heated structure, heat from indoors should be prevented from passing through the walls to the outdoors. Conversely, when the outdoors is hot relative to inside an air conditioned structure, heat from outdoors should be prevented from passing through the walls to the inside. The degree of prevention of heat transfer may be based on considerations of technical feasibility as well as cost.
Heat transfer through walls may be addressed in a variety of ways. Framing may include a top plate, a bottom plate or sill, vertical posts or studs, and mid-section blocking, among other components. Spun fiberglass insulation is commonly placed in the cavities formed by the framing components. Rigid insulation, such as expanded or extruded polystyrene, may also be used. Another method is to inject foam insulation into the cavities. While each of these methods reduces conduction of heat through the areas between framing components, they do not address conduction through the components themselves, which may present a direct and continuous path for heat transfer across the wall. Although heat conduction is of concern with wood framing, it is of even greater concern in metal framing, which has a significantly higher heat transfer coefficient than wood.
Several known designs for insulating walls with metal members attempt to minimize heat transfer by using rigid insulation. The metal members may be, among other things, “C” shaped in cross-section, meaning having a web, first and second flanges generally perpendicular to the web, and returns on each flange, or “U” shaped in cross-section, having a web and first and second flanges generally perpendicular to the web, without returns. The flanges of the members are sometimes embedded in the rigid insulation in slots that are formed by “hot-wiring” the insulation. Such construction adds to the complexity of manufacturing and fabrication, and limits the ability to make on-site modifications.
For the foregoing reasons, there exists a need for a framing component that supports rigid insulation, limits heat transfer through a wall and in particular direct conduction through wall framing, is relatively easy and quick to install, and may allow field modifications.
In accordance with an embodiment of the present invention, a thermal framing component for use in wall framing includes an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, and a second edge parallel to the longitudinal axis. The web has first and second sides. A first tab extends from the first edge at approximately a 90 degree angle from the first side, a second tab extends from the first edge at approximately a 90 degree angle from the second side, and a third tab extends from the second edge at approximately a 90 degree angle from the second side. A fourth edge may extend from the first or second edge in the same plane as the planar web. Alternatively, a fourth tab may extend from the second edge at approximately a 90 degree angle from the first side. Position may be varied, for example, by having tabs along each edge consistently alternate in direction of bending, or by having opposing tabs across the web bent in the same or opposite direction from each other.
In accordance with an embodiment of the present invention, a thermal framing component for use in wall framing includes an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, and a second edge parallel to the longitudinal axis. The web has first and second sides. A first tab extends from the first edge at approximately a 90 degree angle from the first side, a second tab extends from the first edge at approximately a 90 degree angle from the second side, and a third tab extends from the second edge at approximately a 90 degree angle from the second side. A fourth tab extends from the second edge at approximately a 90 degree angle from the first side. The first and third tabs are in longitudinal registration and the second and fourth tabs are in longitudinal registration. Alternatively, the first and fourth tabs are in longitudinal registration and the second and third tabs are in longitudinal registration.
In accordance with another embodiment of the present invention, a thermal framing assembly for use in wall framing includes a top plate, a bottom plate, and a thermal framing component. The thermal framing component includes an upper end and a lower end, the upper end mounted to the top plate and lower end mounted to the bottom plate. The thermal framing component includes an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, and a second edge parallel to the longitudinal axis. The web has first and second sides. A first tab extends from the first edge at approximately a 90 degree angle from the first side, a second tab extends from the first edge at approximately a 90 degree angle from the second side, and a third tab extends from the second edge at approximately a 90 degree angle from the second side. Rigid insulation has an edge in close and complementary registration with a side of the web. Mid-span blocking may also be provided.
In accordance with another embodiment of the present invention, a thermal framing assembly for use in wall framing includes a top plate, a bottom plate, a wall stud, and a thermal framing component. The wall stud includes an upper end and a lower end. The upper end is mounted to the top plate and lower end is mounted to the bottom plate. The thermal framing component is mounted along the wall stud below the top plate and above the bottom plate. The thermal framing component includes an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, and a second edge parallel to the longitudinal axis. The web has first and second sides. A first tab extends from the first edge at approximately a 90 degree angle from the first side, a second tab extends from the first edge at approximately a 90 degree angle from the second side, and a third tab extends from the second edge at approximately a 90 degree angle from the second side. Rigid insulation has an edge in close and complementary registration with a side of the web. Mid-span blocking may also be provided.
In accordance with another embodiment of the present invention, a method of making a thermal framing component is provided. An elongated metal strip is provided including two parallel edges and a longitudinal axis. A portion of the strip is designated as a web, the web having two edges substantially parallel to and spaced from the strip edges. At least at two locations the strip is cut, or an equivalent means such as punching, from each strip edge to the proximate web edge along a path substantially perpendicular to the respective strip edge to form a tab along each web edge. The strip is broken, or bent, along each web edge to bend the tabs to be substantially perpendicular to the web. The tabs may be in longitudinal registration or offset from each other.
In accordance with another embodiment of the present invention, a method of installing a thermal framing assembly is provided. A top plate and a bottom plate are provided with the bottom plate substantially parallel to and spaced from the top plate. First and second thermal framing components are provided, each including an upper end and a lower end. The upper end of each thermal framing component is mounted to the top plate and each lower end to the bottom plate. Each thermal framing component includes an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, a second edge parallel to the longitudinal axis. The web has first and second sides. A first tab extends from the first edge at approximately a 90 degree angle from the first side, a second tab extends from the first edge at approximately a 90 degree angle from the second side, and a third tab extends from the second edge at approximately a 90 degree angle from the second side. Rigid insulation is provided including two substantially parallel edges, and the rigid insulation is inserted between the two thermal components causing the edges to be in close and complementary registration with a side of the web of each component.
In accordance with another embodiment of the present invention, a method of installing a thermal framing assembly includes providing a top plate and a bottom plate substantially parallel to and spaced from the top plate. First and second wall studs are provided, each including an upper and a lower end. The upper end of each wall stud is mounted to the top plate and the lower end of each wall stud is mounted to the bottom plate. First and second thermal framing components are provided. The first thermal framing component is mounted to the first wall stud and the second thermal framing component is mounted to the second wall stud, with the mounting locations below the top plate and above the bottom plate. Each thermal framing component includes an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, a second edge parallel to the longitudinal axis. The web has first and second sides. A first tab extends from the first edge at approximately a 90 degree angle from the first side, a second tab extends from the first edge at approximately a 90 degree angle from the second side, and a third tab extends from the second edge at approximately a 90 degree angle from the second side. Rigid insulation is provided, including two substantially parallel edges. The rigid insulation is inserted between the two thermal components causing the edges to be in close and complementary registration with a side of the web of each component.
Features and advantages of the present invention will become more apparent in light of the following detailed description of some embodiments thereof, as illustrated in the accompanying figures. As will be realized, the invention is capable of modifications in various respects, all without departing from the invention. Accordingly, the drawings and the description are to be regarded as illustrative in nature, and not as restrictive.
A thermal framing component of the present invention may receive and secure rigid insulation and may also provide an attachment surface for exterior sheathing or finish materials. The thermal framing component may provide a thermal circuit break or reduce conduction of heat through framing members by limiting metal to metal contact, in particular to improve the thermal performance of steel framing structures. Mounting of thermal framing components to wood studs may further decrease heat transfer while providing stability. In general, thermal performance may be improved by attempting to minimize the direct thermal transfer through the primary structural framing components.
The thermal wall component may be fabricated from light gauge steel or other metal, and may be incorporated into conventional and proprietary wall framing components of light gauge steel or wood. The scope of the invention is not intended to be limited by materials or dimensions listed herein, but may be carried out using any materials and dimensions that allow the construction and operation of the present invention. Materials and dimensions depend on the particular application. Metal primary structural framing members may be “C” shaped, “U” shaped, or other shape as selected by one of ordinary skill in the art. Certain relative dimensions, sizes, and spacings are shown on the Figures and discussed herein; it should be understood that the dimensions, sizes, and spacings shown and discussed merely illustrate selected embodiments of the invention. Further, certain terms of orientation such as“top,” “bottom,” “upper,” “lower,” “inner,” “outer,” “interior,” and “exterior” are used for convenience and refer to the position of elements as shown in the figures, which generally correspond to installed positions, but should not be construed as limiting to the invention.
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In installation, a thermal component may be mounted, for example, to a top plate and bottom plate, or to a wall stud, or combination thereof. Then one vertical edge of rigid insulation is inserted into the slot formed by the tabs. Another thermal component is positioned onto the free vertical edge of the insulation, and is then mounted to the desired parts. This process may be repeated to install the thermal components and insulation along the wall. Alternatively, more than one thermal component may be mounted prior to placement of the rigid insulation, and the rigid insulation may be slid into the slot or slots formed by the tabs, either from the bottom or the top.
Specific embodiments of an invention are described herein. One of ordinary skill in the structural engineering arts will recognize that the invention has other applications in other environments. For example, sheet materials other than rigid foam insulation may be secured by the thermal framing components. In addition, the recitation “means for” is intended to evoke a means-plus-function reading of an element in a claim, whereas, any elements that do not specifically use the recitation “means for,” are not intended to be read as means-plus-function elements, even if they otherwise include the word “means.” The following claims are in no way intended to limit the scope of the invention to the specific embodiments described.
This application claims priority from co-pending U.S. provisional application No. 60/497,674, filed Aug. 25, 2003, by the inventor hereof, the entire disclosure of which is incorporated herein by reference.
Number | Date | Country | |
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60497674 | Aug 2003 | US |