The present invention relates to thermal insulation of walls, and more particularly to systems for supporting rigid insulation in structural 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 sheets or panels, such as those made from expanded or extruded polystyrene or polyisocyanurate, 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 generally do not address conduction through the components themselves, which may present a direct and continuous path for heat transfer across the wall.
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 system that supports rigid insulation to limit heat transfer through a wall, is relatively easy and quick to install, and may allow field modifications.
In accordance with an embodiment of the present invention, a thermal wall system includes top and bottom tracks, top and bottom plates, and vertical studs mounted to and extending between the top and bottom plates. Each track and plate includes a web in an approximately horizontal plane, a first flange, and a second flange. The top track flanges and top plate flanges extend downward at approximately right angles to the web. The bottom track flanges and bottom plate flanges extend upward at approximately right angles to the web. The web and first flanges of the top track and top plate are substantially nested. The second flanges of the top track and top plate are spaced, forming a longitudinal opening. Likewise, the web and first flanges of the bottom track and bottom plate are substantially nested and the second flanges of the bottom track and bottom plate are spaced, forming a longitudinal opening. The top track and bottom track oppose each other, the top plate and bottom plate oppose each other, and the longitudinal openings oppose each other.
In accordance with another embodiment of the present invention, rigid insulation disposed between the top and bottom tracks includes two approximately horizontal edges respectively disposed in the longitudinal openings and two approximately vertical edges.
In accordance with another embodiment of the present invention, a vertical thermal framing component is provided and extends between the top and bottom plates. The thermal framing component includes a web with projections from each edge at right angles to the web in both directions, such that a slot is formed on each side of the web.
In accordance with another embodiment of the present invention, a thermal wall system includes top and bottom tracks, top and bottom plates, and vertical studs mounted to and extending between the top and bottom plates. Each track and plate includes a web in an approximately horizontal plane, a first flange, and a second flange. The top track and top plate flanges extend downward at approximately right angles to the web. The bottom track and bottom plate flanges extend upward at approximately right angles to the web. The web and first flanges of the top track and top plate are substantially nested. The second flanges of the top track and top plate are spaced, forming a longitudinal opening. Likewise, the web and first flanges of the bottom track and bottom plate are substantially nested and the second flanges of the bottom track and bottom plate are spaced, forming a longitudinal opening. Vertical thermal framing components interposed between the studs and extending between the top and bottom plates, each include an elongated planar web including a longitudinal axis, a first edge parallel to the longitudinal axis, a second edge parallel to the longitudinal axis, a first side, and a second side. Each thermal framing component has four of more tabs: a first tab extending from the first edge at approximately a 90 degree angle from the first side; a second tab extending from the first edge at approximately a 90 degree angle from the second side; a third tab extending from the second edge at approximately a 90 degree angle from the second side, wherein the second and third tabs form a slot; and a fourth tab extending from the second edge at approximately a 90 degree angle from the first side, wherein the first and fourth tabs form a slot. There are a plurality of rigid insulation sheets disposed between the top and bottom tracks, each sheet including two approximately horizontal edges respectively disposed in the longitudinal openings and two approximately vertical edges, each of which is disposed in a slot. The top track and bottom track oppose each other, the top plate and bottom plate oppose each other, and the longitudinal openings oppose each other.
In accordance with another embodiment of the present invention in which a thermal wall system includes rigid insulation with an approximately vertical edge, a thermal end cap includes an approximately vertical web with flanges projecting from each edge at approximately right angles to one side of the web. The approximately vertical edge of rigid insulation is disposed between the flanges.
In accordance with another embodiment of the present invention, a method of assembling a thermal wall system includes providing a top plate including a web in an approximately horizontal plane, a first flange, and a second flange, the flanges extending downward at a right angle to the web. A bottom plate is provided including a web in an approximately horizontal plane, a first flange, and a second flange, the flanges extending upward at a right angle to the web. At least two approximately vertical studs are provided. One end of the studs is mounted to the top plate and the other end to the bottom plate. A top track is provided having a web in an approximately horizontal plane, an interior flange, and an exterior flange, with the flanges extending downward at a right angle to the web. A bottom track is provided having a web in an approximately horizontal plane, an interior flange, and an exterior flange, with the flanges extending upward at a right angle to the web. A top plate or bottom plate is mounted to the respective top track or bottom track, such that the selected plate is disposed in the respective track and the plate and track webs and first flanges are substantially nested and a first longitudinal opening is formed between the second flanges. At least one rigid insulation sheet is provided to fit between the top and bottom track and corresponding longitudinal openings. One horizontal edge of the rigid insulation sheet is inserted into the first longitudinal opening. The remaining track is mounted to the respective remaining plate, such that the remaining plate is disposed in the remaining track and the remaining plate and remaining track respective webs and first flanges are substantially nested and a second longitudinal opening is formed between the second flanges. The remaining free horizontal edge of the rigid insulation sheet is inserted in the second longitudinal opening.
In accordance with another embodiment of the present invention, the method of assembling a thermal wall system may further include providing at least two vertical thermal framing components, each including a web and projections from each edge at right angles to the web in both directions, such that a slot is formed on each side of the web. The thermal components are mounted to the top and bottom plates before mounting the top and bottom tracks to the respective plates. Each approximately vertical edge of the rigid insulation sheet is inserted into at least one thermal framing component slot.
In accordance with another embodiment of the present invention, a thermal end cap is provided including a vertical web with opposing flanges projecting from each edge at right angles to one side of the web. The thermal end cap is mounted on a vertical edge of a rigid insulation sheet, wherein the edge of the insulation is between the flanges.
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 wall system of the present invention may receive and secure rigid insulation and may also provide an attachment surface for exterior finish materials. The thermal wall system may reduce conduction of heat through a wall by providing insulation and, as applicable, limiting direct conduction through some structural framing members.
The thermal wall system may include 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,” “horizontal,” “vertical,” “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.
Dimensions and spacing may be selected as known by one of ordinary skill in the art. For example, the plates may be 2½ inches (6.35 cm) wide, the tracks 3⅝ inches (9.21 cm) wide, and the insulation 1 inch (2.54 cm) thick, leaving a slight excess of space for the insulation. Or, the plates could be 3½ inches (8.89 cm) wide, the tracks 5½ inches (13.97) wide, and insulation 2 inches (5.08 cm) wide for a snug fit. Vertical studs 36 may be spaced, for example, at 24 inches (61 cm) on center. Where orientations are noted or shown it should be understood that the orientations are approximate, such as approximately horizontal and approximately vertical. Thermal components 44 may be spaced between the vertical studs 40, also 24 inches (61 cm) on center or as otherwise selected by one of ordinary skill in the art.
A section view showing the top and bottom configurations is shown in
In a reverse arrangement to the top track 34 and plate 32, the bottom track 38 may be a “U” shape, having a horizontal web 66 with flanges 68, 70 extending upward from each edge. One flange may again be referred to as the interior flange 68. The other flange may be referred to as the exterior flange 70. The bottom track 38 goes beneath and around the bottom plate 36, which also has a web 72, an interior upward flange 74, and an exterior upward flange 76, regardless of whether the bottom plate 36 is metal as shown or wood. The bottom plate 36 may also have returns 78, 80, and is shown as a “C” shape. Again, the webs 66, 72 and interior flanges 68, 74 are substantially nested, and therefore may be considered to be in close and complementary registration. The exterior flanges 70, 76 are spaced from each other, and form a longitudinal opening 82 that is aligned with, and opposes, the longitudinal opening 64 at the top track 34 and plate 32. Rigid insulation 46 is disposed in the bottom longitudinal opening 82 as well as the top longitudinal opening 64.
Thermal framing components and a variety of their connections to framing members are shown in
A portion of a thermal framing component 44 is shown in
Inner tabs 98-100 provide surfaces for mounting to the framing members (not shown), while outer tabs 101-104 provide mounting surfaces for exterior sheathing or finish material. Laterally aligned tabs, for example, tabs 98 and 101, 99 and 102, and 100 and 104, could be bent in the same direction and still be according to the present invention, but are shown to be bent in opposite directions. Bending such tabs in opposite directions provides clear, open access to the surface of the tab that is to be attached to a framing member. Tabs that are directly across the web from each other, or laterally aligned and at the same location along the longitudinal axis, may be considered to be in longitudinal registration.
In
In one method of assembly, a thermal wall system may be constructed as a wall panel, which is then installed to frame the structure. First the top plate, bottom plate, and studs may be assembled. Then a thermal framing component, if any, may be added. One vertical edge of rigid insulation may be inserted into the slot formed by the tabs of the thermal component. Another thermal component may be positioned onto the free vertical edge of the insulation, and may be then mounted to the top plate and bottom plate. This process may be repeated to install the thermal components and insulation along the wall system. Alternatively, more than one thermal component may be mounted prior to inserting insulation, and then the insulation may be inserted by sliding it into the slots of the thermal components from either the top or bottom. The top track may be placed over the top plate and the adjacent top horizontal edge of insulation. Likewise, the bottom track may be placed under the bottom plate and the adjacent bottom horizontal edge of insulation. The tracks may be fastened in place. Mid-span blocking may also be provided, and thermal framing components may be mounted to the mid-span blocking if desired. Thermal end caps may be placed over the terminal vertical edge of insulation, or alternatively may be mounted first and then the insulation may be inserted by sliding into the end cap slot. The framing method may be performed, for example, as a prefabricated assembly offsite, or onsite. The assembly may also be performed in place, with the assembly being performed from the bottom upward.
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 insulation may be mounted to the frame components. Different materials other light gauge steel, and wood may be used and remain within the scope of the present invention, such as other metals, composites, or plastics. 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 U.S. provisional application 60/481,484, filed Oct. 8, 2003, by the inventors hereof, the entire disclosure of which is incorporated herein by reference.
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