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VEVOR offers a comprehensive range of foam board insulations designed to deliver superior thermal performance, moisture resistance, and structural support for residential and commercial building projects. There are different types of foam insulation board systems, ranging from thin 1/2-inch panels for interior walls to thick 3-inch systems for exterior walls. All of them have a high R-value per inch, a closed-cell structure, and stable dimensions. VEVOR's foam board insulations are available for new construction, retrofits, and energy-efficiency upgrades at competitive prices and with reliable customer service.
Are you looking for insulation with the highest R-value at the smallest thickness that's structurally strong and easier to install? Foam board insulation performs better than other types because it creates continuous thermal barriers without gaps, compression, or moisture sensitivity that degrade performance in the real world. VEVOR's foam board insulation comes in a range of thicknesses to fit above-grade walls, below-grade foundations, and other unique situations where limited space or exposure to moisture call for the best insulation technology.
To pick the right foam board insulation, you must first know what the R-value requirements are for your climate zone and building assembly. VEVOR's foam board insulation comes in a range of thicknesses from 1/2 inch to 3 inches and R-values, so it can meet any thermal performance need.
The R-value measures heat resistance; higher numbers indicate better insulation. Foam board insulation has a much higher R-value per inch than fiberglass batts, making it ideal for tight spaces. Expanded polystyrene (EPS) VEVOR foam board insulation provides about R-4 per inch of thickness. This means that a 2-inch foam board provides a total of R-8, which is the same as a 3-inch fiberglass batt in half the room.
If you install polyiso foam boards properly, they can offer R-6 to R-6.5 per inch of insulation, while extruded polystyrene (XPS) sheets offer R-5 per inch. Their closed-cell structure prevents air from passing through the material, so the rated R-value remains the same even when it comes into contact with humidity or small amounts of moisture, which would greatly reduce fiberglass's performance.
When comparing products, make sure that the manufacturer's specs show the "aged" R-value. Over the first year, polyiso boards lose 10 to 15 percent of their initial R-value due to the breakdown of the blowing agents. VEVOR clearly labels foam board insulations with both the original R-value and the aged R-value.
Building rules set minimum R-values for walls, roofs, and foundations based on climate zone. For example, areas in the south that are warmer need less insulation than areas in the north that are colder and have higher heating costs. A 1 inch foam insulation board with R-5 to R-6 meets the code requirements for walls in the southern zone, but not for walls above grade in the northern zone, which needs R-20 or higher.
VEVOR's 2 inch foam insulation board panels offer R-10 to R-12, which is enough to meet most wall needs in moderate climates while still being thin enough to fit inside standard 2x4 stud bays when used as internal insulation. 3 inch foam insulation board systems provide R-15 to R-19, meeting or exceeding code standards for zones 5 through 7 without the need for double-layer installations.
They are ideal for cold climates or exterior continuous insulation applications. Roof systems usually need higher R-values than walls because the sun heats them up more, and warm air rises. VEVOR foam board insulations provide temperature zone recommendations and code-compliance guidance.
Depending on the thickness and type of foam, foam board insulations can either slow down or stop the flow of vapor. This is an important consideration when designing the building envelope to prevent condensation and moisture damage. The 1/2 inch foam insulation board pieces from VEVOR are thin enough to let some vapor pass through, so small amounts of moisture can move through without causing condensation on the inside.
In interior settings where building codes require vapor-permeable assemblies, these work well. More layers of boards make it harder for vapor to pass through. For example, 2-inch and 3-inch foam insulation boards work well as vapor barriers. The technique is helpful for exterior continuous insulation because the board keeps warm, humid air inside from reaching the cold sheathing outside, where condensation would form.
But if you don't carefully manage the vapor that forms between the thick foam and the exterior sheathing when using it as internal insulation in cold places, mold and rot can grow. VEVOR's assembly guides show where to put the vapor barrier based on the thickness and use of the foam board insulation.
When the thickness of a single foam board insulation can't achieve the desired R-value, stacking several boards with their seams spaced out provides a higher total R-value while keeping board sizes and weights reasonable. Putting in two layers of 2 inch foam insulation board with seams that are not lined up with each other gives you R-20 to R-24 and stops thermal bridges at the joints.
If one layer of boards has holes at the seams, this layered method also does a better job of sealing air. This is because the offset second layer stops air from getting in. Some models of VEVOR's foam board insulations feature shiplap edges or tongue-and-groove profiles, which create tighter seam connections than square-cut edges. The result prevents air leakage and improves the insulation's overall thermal performance.
When you layer boards, switch their direction so that the seams in the first layer run perpendicular to those in the second layer. This crosshatch pattern makes it easier to cover any possible thermal weak spots. Mechanical or adhesive clamps hold layers securely in place.
For walls, roofs, foundations, and other unique applications where thermal bridging or moisture exposure requires specialized solutions, VEVOR's foam board insulation is available in standard and custom sizes.
VEVOR's foam board insulations come in standard 4x8-foot sheets that fit standard building modules. This reduces waste and makes it easier to lay out walls and roofs with frames spaced 16 or 24 inches apart. The 48-inch width covers three stud bays spaced 16 inches apart or two bays spaced 24 inches apart.
This feature means that full-height panels can go from the bottom plate to the top plate of a single-story wall without any horizontal seams. When you need non-standard sizes, like around windows, in cathedral ceilings, or on foundations with odd shapes, foam boards are easy to cut with utility knives, handsaws, or hot-wire cutters. They don't make the itchy dust that comes from cutting fiberglass batts.
You can score both sides of VEVOR's 1 inch foam insulation board and smaller panels to make clean cuts. Handsaws are better for cutting 2-inch and 3 inch foam insulation board to get straight, clean edges. Use straight edges to guide your cuts when cutting foam board insulations so that the edges aren't too rough. Panels that fit tightly together keep out air better and retain heat.
Adding different facings to foam board insulation alters its fire rating, airflow, longevity, and compatibility with finishes. VEVOR's foil-faced foam board insulations have aluminum foil laminated to one or both sides. This creates a radiant barrier that blocks heat and raises the R-value in areas with air gaps, such as attic rafters.
Foil facings also work well as a vapor barrier and have a tough surface that doesn't get damaged during handling and placement on the job site. It is lighter than foil, keeps its vapor barrier qualities, and doesn't tear easily when installed over rough substrates. Plastic-faced boards use reinforced polyethylene films. It's cheaper and easier to use finishes like stucco, plaster, or drywall cement directly on unfaced foam board insulation.
For basement walls and foundations below grade, VEVOR offers foam board insulations with water-resistant facings that withstand direct contact with soil and ground moisture without delaminating. Check that the facings you choose will work with the finish materials so that they stick well and last a long time in exterior continuous insulation systems.
The thickness of VEVOR's foam board insulations ranges from 1/2 inch to 3 inches and more. All of them offer a higher R-value per inch, moisture resistance, and greater stability in size compared to other insulation materials. VEVOR is the best choice for builders, contractors, and DIYers who want to make their homes more energy-efficient, as it comes with standard 4x8 panels and different facing options. Check out VEVOR's full selection of 1 inch foam insulation board, 2 inch foam insulation board, and 3 inch foam insulation board today to make thermal shields that will last for decades.
Southern zones (1-3) typically require R-13 to R-15 for walls, which can be achieved with approximately 2 inches of foam insulation board. Northern zones (5-7) require R-20+ for walls and R-49+ for attics, often necessitating 3 inch foam insulation board or layered assemblies. Check local building codes for exact requirements in your area.
Yes. VEVOR's closed-cell foam board insulations resist moisture and provides continuous insulation over concrete foundations. Use 1 inch foam insulation board for R-5, 2 inch foam insulation board for R-10, or 3 inch foam insulation board for approximately R-15, depending on climate zone requirements. Install a vapor barrier facing toward the interior living space.
For 1/2-inch and 1-inch foam insulation boards, use a sharp utility knife with a straight edge to score both sides, then snap along the line. Thicker 2 inch and 3 inch foam insulation board cuts cleanly with a handsaw or circular saw. Always cut in well-ventilated areas and wear a dust mask.
It depends on thickness and application. Boards 2 inches or thicker function as effective vapor barriers themselves. Thinner 1/2 inch foam insulation board may require separate vapor barriers depending on climate and code requirements. VEVOR provides vapor management guidance specific to each product and application type.
