Capacity planning runs through every corner of construction. The same math that tells a city how many vehicles an intersection can handle tells a panel plant how many sheets a new line can laminate, and the traffic impact studies and intersection capacity work that sizes a roundabout uses the same queuing logic as a production schedule. A Texas manufacturer is betting on that logic: a new production line at its Corrigan facility will double the output of foil-faced oriented strand board when it runs at full capacity.
The product, a structural roof sheathing panel with a reflective aluminum foil laminated to one face, has been in production since 2003. Demand outgrew the original line, and the expansion shows how a niche product becomes a standard building material when codes and housing markets move in its direction.
Why Demand for Radiant Barrier Sheathing Is Rising
A radiant barrier roof deck is roof sheathing with a reflective foil laminated to one face. Installed with the foil facing the attic, it reflects radiant heat back out of the building instead of letting it soak into the insulation and the living space below. Builders in hot climates have used the product for decades, but the volume only recently justified a second production line.
Demand growth follows a pattern familiar across manufacturing, from the Winnipeg factory expansion for large tank production to sawmills adding kilns: when a product’s market outgrows the plant, the response is a new line. The supplier in this case runs two mills, and the expansion goes into the newer facility, which is the one with room and utilities to spare.
Building Code Changes
Energy codes have pushed roof assemblies toward better thermal performance for two decades. Some jurisdictions require or incentivize radiant barriers on roof decks in hot climates, and others accept them as an alternative compliance path for attic insulation and ventilation requirements. Code changes move product specifications faster than any marketing campaign, because builders specify what the inspector will approve.
Housing Starts in Hot Markets
Radiant barrier roof decks sell where summers are long and cooling bills are high: the Southeast, the Southwest, Texas, and the Gulf Coast. When housing starts climb in those regions, demand for the product climbs with them. The manufacturer that introduced foil-faced OSB in 2003 spent 18 years improving its original line, then concluded in 2019 that the market had outgrown the machine and started planning the new one.
The demand mix matters as much as the total. Single-family builders order radiant barrier decking by the truckload for whole subdivisions, while remodelers buy it by the sheet for attic retrofits and bonus rooms. Serving both channels from one plant is what the second line makes possible.
How a Radiant Barrier Roof Deck Works
Heat moves three ways: conduction through solid materials, convection through air, and radiation across open space. A roof absorbs solar radiation all afternoon and re-emits it as heat; on a summer day an unvented attic can push past 150 degrees Fahrenheit. A radiant barrier interrupts the radiation path by reflecting heat instead of absorbing it.
Reflectivity is the property that does the work. Polished aluminum foil reflects up to 95 percent of radiant heat and emits almost none of its own, while ordinary sheathing absorbs most of the heat it receives and radiates it into the attic. The radiant barrier insulation guides aimed at homeowners explain the same concept in plain language: foil stops heat the way a mirror stops light.
Emissivity and Reflectivity
Emissivity measures how well a surface emits thermal radiation on a scale of 0 to 1. A low-emissivity surface both reflects incoming heat and resists radiating heat it has absorbed, which is why foil works in both directions. Field research in hot climates, including studies from the Florida Solar Energy Center, has measured attic heat gain reductions of 25 to 40 percent and cooling load savings of roughly 10 to 25 percent in homes with radiant barrier decks.
Which Way the Foil Faces
Orientation matters. In a roof deck application the foil faces down, toward the attic air space, with an air gap of at least one inch so the barrier can reflect across it. Foil facing up against the shingles does little, because there is no gap to reflect across. Dust settling on a downward-facing foil over years can also cut its reflectivity, so the foil surface should stay clean until the roof is closed in.
| Surface | Emissivity | Where it is used |
|---|---|---|
| Polished aluminum foil | 0.03-0.05 | Radiant barrier roof decks |
| Unpainted OSB or plywood | 0.85-0.90 | Standard roof sheathing |
| Asphalt shingles | 0.85-0.95 | Roof covering |
| Galvanized steel roofing | 0.20-0.28 | Metal roofs |
How Foil-Faced OSB Is Manufactured
Foil-faced OSB starts as a standard structural panel: strands of wood oriented in layers, bonded with resin under heat and pressure. The radiant barrier version adds one step, laminating a thin aluminum foil to the panel face before the panel leaves the plant.
The Laminating Line
The new production line combines a panel machine with a laminating station. Panels feed through adhesive application, foil layup, and nip rollers that press the foil flat against the board, and the finished sheet exits with the foil bonded across the full face. Equipment like a Globe Machine line with a Black Brothers laminating station is typical of this stage of the process.
Adhesion and Quality
The bond has to survive job site handling, nail guns, and years of temperature swings in an attic. Quality control runs through the whole lamination process:
- Foil adhesion pull tests on finished panels
- Visual inspection for wrinkles, bubbles, and skips in the foil
- Moisture checks on the board before lamination
- Edge sealing so the foil does not peel at cut lines
A small defect in the foil reads as a hot spot in the attic later, which is why manufacturers reject panels at the plant instead of letting the inspector find them on the roof.
Doubling the Output
Two production lines running the same product mean the plant can serve two markets without changeovers: builders who order radiant barrier decking as a standard option and distributors who stock it for code-driven retrofits. Doubling capacity also shortens lead times, and lead time discipline matters on site too; crews that organize materials and tools the way large-capacity rolling tool bags organize a work face get panels up faster and waste less.
Specifying and Installing Radiant Barrier Sheathing
Radiant barrier sheathing goes on the roof deck in hot climates, typically over conditioned attics, garages, and bonus rooms where ductwork runs in the attic space. It replaces standard sheathing one for one, and the structural ratings match conventional OSB, so no framing changes are needed. The only specification change is which face of the panel points down.
Quantities and Coverage
Sizing a radiant barrier roof is straightforward. A 2,000-square-foot single-story home with a 4:12 roof pitch has roughly 2,100 square feet of deck area, which works out to about 66 sheets of 4 by 8 panel. Ordering 5 to 10 percent extra covers cut waste around hips, valleys, and roof penetrations.
For a retrofit, the same panels can be applied over existing rafters before new roofing goes on, or a foil product can be draped over the insulation from below. The sheathing route is the one that doubles as the structural deck, which is why new construction is the biggest market.
Fastening and Layout
- Lay panels with the foil face down toward the attic
- Stagger panel joints and hold a 1/8-inch gap at panel edges
- Fasten per the structural panel schedule, typically 6 inches on center at edges and 12 inches in the field
- Cut with carbide-tipped blades, since the foil dulls steel quickly
- Keep the foil clean and dry until the roof is covered
Capacity in Other Units
Contractors track capacity in several units on the same job. Cordless battery capacity is measured in amp-hours and watt-hours, deck coverage in sheets per day, and roof load in pounds per square foot; each unit answers a different planning question, and mixing them up is where schedules slip.
Energy Performance and Payback
The numbers that matter to a homeowner are cooling savings and attic temperature. Radiant barrier decks cut peak attic temperatures by 10 to 30 degrees Fahrenheit in hot climates, which trims cooling load during the hours when air conditioners work hardest. The U.S. Department of Energy estimates radiant barriers can reduce cooling costs by 2 to 10 percent in warm climates, with the biggest savings in homes that keep ductwork in the attic.
Combining Radiant Barrier With Insulation
A radiant barrier complements insulation instead of replacing it. Insulation slows conduction, foil stops radiation, and ventilation removes the heat that gets through; the three work together. Builders who want the full mechanism spelled out can read how reflective foil lowers attic heat gain in a roof assembly, including where the foil layer sits relative to the insulation.
Ventilation and Moisture
Attic ventilation still does its job with a radiant barrier deck. Building codes typically call for 1 square foot of vent area per 150 to 300 square feet of attic floor, and the foil does not change that requirement; what changes is the heat load the vents have to remove. Moisture behavior stays the same as with standard sheathing, so vapor retarder placement follows the same rules.
Barrier systems appear all over construction, each one using a material property to interrupt a specific energy path. A roof deck stops radiant heat, and highway sound barrier masonry walls stop noise; matching the barrier to the energy form is the whole job. Specified correctly, a foil-faced deck is a code response, an energy saver, and a selling point in one panel.