INSULATING RADIANT BARRIER FACTORY BONDED TO CELLULOSIC SUBSTRATE

Abstract

An insulating radiant barrier sheathing product formed by directly bonding or applying an insulating radiant barrier (IRB) material to the interior surface (i.e., facing the attic or other interior space) of a wood, wood-based, manufactured wood, or cellulosic panel or structural or sheathing panel. The IRB panel product may be used as a roof sheathing panel, with one or more outer protective and finishing layers applied to the outer surface, such as, but not limited to, an underlayment and roofing shingles. The IRB material may comprise a mixture of a radiant barrier (RB) paint and a granulated insulating material. The granulated insulating material may comprise cork, EPS, XPS, poly-iso, other similar insulating material, or combinations thereof.

Claims

1. A roof sheathing panel, comprising: a core structural layer with an exterior face and an interior face; and a combined insulating radiant-barrier layer covering some or all of the interior face.

2. The panel of claim 1, wherein the core structural layer is a manufactured-wood panel.

3. The panel of claim 1, wherein the core structure layer is an oriented strand board panel.

4. The panel of claim 1, wherein combined insulating radiant-barrier layer contains a mixture of a radiant barrier paint and a granulated insulating material.

5. The panel of claim 4, wherein the granulated insulating material comprises cork.

6. The panel of claim 4, wherein the granulated insulating material comprises extruded polystyrene.

7. The panel of claim 4, wherein the granulated insulating material comprises expanded polystyrene.

8. The panel of claim 1, wherein the combined insulating radiant-barrier layer has an emissivity value of from 0.10 to 0.25.

9. A method of producing the panel of claim 1, comprising the steps of: providing a section of oriented-strand board with a first face and a second face; while transporting the section of oriented-strand board on a factory conveyor line, applying an insulating radiant-barrier coating material to said first face; and after applying the insulating radiant-barrier coating material, dividing the section of oriented-strand board into two or oriented strand board panels.

10. The method of claim 9, wherein the step of applying comprises curtain-coating the first face with the insulating radiant-barrier coating material.

11. The method of claim 9, wherein the step of applying comprises spraying the insulating radiant-barrier coating material on the first face.

12. The method of claim 9, wherein the step of applying comprises rolling the insulating radiant-barrier coating material on the first face.

13. The method of claim 9, wherein the step of applying comprises brushing the insulating radiant-barrier coating material on the first face.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 shows a view of a new radiant barrier system with an insulating radiant barrier (IRB) in accordance with the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0008] In various exemplary embodiments, the present invention comprises an insulating radiant barrier sheathing product 2 formed by directly bonding or applying an insulating radiant barrier (IRB) material 10 to the interior surface (i.e., facing the attic space) of a wood, wood-based, manufactured wood, or cellulosic panel or structural or sheathing panel 20.

[0009] In the embodiment shown in FIG. 1, the IRB panel product 2 is used as a roof sheathing panel, with one or more outer protective and finishing layers applied to the outer surface, such as, but not limited to, an underlayment 22 and roofing shingles 24. A weather-resistant barrier may also be applied to the exterior face of the sheathing panel, and as such would be located underneath the underlayment and roofing shingles. The IRB surface faces into the attic (or interior) space 50. The IRB panel product 2 may also be used as any form of wall sheathing or similar sheathing panel.

[0010] The panel 2 may be of any suitable thickness and size (e.g., 4′×8′), but typically has a thickness between ⅜″ and 3″. The inner surface is coated with an IRB material 10 comprising a mixture of a radiant barrier (RB) paint and a granulated insulating material. In one exemplary embodiment, the RB paint (and the resulting combined IRB material) has an emissivity value of 0.10 to 0.25, although emissivity values outside of that range may also be used.

[0011] The granulated insulating material may comprise any number of materials which possess thermal conductivity at or below 0.05 W/m.Math.K, such as, but not limited to, cork, EPS, XPS, poly-iso, aerogel, perlite, other similar insulating material, or combinations thereof. The granules of the low thermal conductivity material can be of various dimensions, with an average particle size between 150 to 5,000 microns. In another embodiment, the insulating material may be applied directly to the interior-facing surface of the wood-based, manufactured wood, or cellulosic panel or structural or sheathing panel, and then subsequently coated with a layer of the RB paint.

[0012] The IRB material may be applied to the panel at various points. In one exemplary embodiment, the IRB material is factory-applied, or applied during or in conjunction with the manufacturing process. In another embodiment, the IRB material is field-applied on panels prior to installation of the panels on the jobsite (e.g., prior to installation on a building or structure frame). In another embodiment, the IRB material is applied after installation of the panels on the jobsite (e.g., after installation on the building or structure frame), which has the advantage of allowing the IRB material to coat the inner face of the wood structural panels as well as other, adjacent structural roofing members, thereby enhancing the reduction of the incidence of heat transfer into the attic (or other interior) space.

[0013] The resulting insulating radiant barrier sheathing product provides high insulating and low emissivity properties due to the IRB surface, which results in dramatically lower heat-transfer into the attic space, and in turn, reduced the energy load on HVAC systems, reducing energy costs. Used independently, these materials would not yield the same collective benefit as can be observed with the combination. By using a novel approach of intermixing a low thermally conductive material with a low thermally radiative material, the panel is able to combat the transfer of heat in two forms: conduction and radiation.

[0014] When the sun's radiant energy causes the roofing materials to elevate in temperature, this energy wants to balance itself out across adjoining materials and the surrounding area. Some of this energy is radiated back into the surrounding outdoor air, but a large portion is also conducted directly into the structure of the roof, such as the sheathing and roof framing members. When a radiant barrier or other low emissivity material is used in the roof assembly, the amount of energy radiated into the attic space is dramatically reduced. When insulation is used in a roof assembly, the low thermal conductivity of the insulating material prevents a large proportion of this energy from entering the attic space as well. Today, builders and homeowners must choose which of these products to utilize that best fits their need. The present invention combines roof sheathing, low emissivity, and low thermal conductivity in a single solution.

[0015] The use of an insulating material in this product also slows the radiation of heat outward at night in cooler environs (i.e., night sky radiation), thereby preventing condensation and moisture buildup. This unique approach enables homes in colder climates to take advantage of the benefits of lower heat transfer into their attics during hot summer months, which they cannot presently do as a result of the risk of condensation.

[0016] In one exemplary embodiment, the radiant barrier sheathing described herein is formed as follows. First, a section of OSB (oriented-strand board) is manufactured in a typical OSB production process to serve as the base material for structural panel substrates. Oriented, multilayer wood strand boards of the above-described type, and examples of processes for pressing and production thereof, are described in detail in U.S. Pat. Nos. 3,164,511, 4,364,984, 5,435,976, 5,470,631, 5,525,394, 5,718,786, and 6,461,743, all of which are incorporated herein in their entireties by specific reference for all purposes. The OSB is fed through a conveyor line where the IRB coating material (as described above) is applied to a surface or face. The IRB coating material may be curtain-coated, sprayed, or rolled or brushed onto the surface. One or more panels of desired sized are separated from, or cut or sawn from, the coated OSB.

[0017] Thus, it should be understood that the embodiments and examples described herein have been chosen and described in order to best illustrate the principles of the invention and its practical applications to thereby enable one of ordinary skill in the art to best utilize the invention in various embodiments and with various modifications as are suited for particular uses contemplated. Even though specific embodiments of this invention have been described, they are not to be taken as exhaustive. There are several variations that will be apparent to those skilled in the art.