What is the R-value of 2 inch foam board?
R-Value Chart for EnerfoilTM Rigid Foam Faced Insulation
| Thickness (Inches) | R-value (in I-P/Imperial) | RSI (R-value in Metric) |
|---|---|---|
| 1.5 | 9.3 | 1.62 |
| 2.0 | 12.4 | 2.16 |
| 2.5 | 15.5 | 2.7 |
| 3.0 | 18.6 | 3.24 |
How much R-value does XPS lose?
An initially rated R-value 5.0 XPS product will eventually drop to closer to an R-value of 4.3. Since EPS is made up of only air and polystyrene, its R-value does not depreciate over time.
Is XPS a good insulator?
EPS is slightly more permeable to air and moisture, whereas XPS is less resistant to water vapour. Therefore, if you’re looking to insulate a humid area (e.g. floors, cellars and foundation walls), XPS is your best option.
What is the R-value of 1.5 inch foam board?
R-6.3
EPS Thickness R-Value (Rigid Insulation Chart 4)
| ISO Thickness: | R-Value: |
|---|---|
| 1 Inch EPS Foam Board | R-4.2 |
| 1.5 Inch EPS Foam Board | R-6.3 |
| 2 Inch EPS Foam Board | R-8.4 |
| 2.5 Inch EPS Foam Board | R-10.5 |
Which foam board has the highest R-value?
Polyisocyanurate
Polyisocyanurate: Known as polyiso for short, polyisocyanurate foam has the highest R-value per inch (R-6.5 to R-6.8) of any rigid insulation. This type of rigid foam usually comes with a reflective foil facing on both sides, so it can also serve as a radiant barrier.
What is the thinnest insulation with highest R-value?
Thermablok® Aerogel is a revolutionary advancement in thermal technology offering the thinnest insulation available to prevent thermal and cold bridging. Classed as a Super Insulation, Aerogel has the highest insulation value of any known material with the lowest thermal conductivity value of any solid (0.015W/mK).
Does XPS insulation degrade over time?
Polyisocyanurate (polyiso), XPS, and spray closed-cell foams substantially degrade over time as the insulating blowing agent gases diffuse out and plain air diffuses in.
Which is better EPS or XPS?
In general, when comparing EPS and XPS board densities, the compressive strength of XPS is greater than that of EPS. For EPS to achieve the same compressive strength as XPS, the density of the foam would need to be increased, often resulting in a greater thickness of board being required.
Does XPS insulation absorb water?
Independent research2 has shown that over time XPS will actually absorb and retain more moisture than EPS resulting in a significant decrease in R-value. One of the studies showed XPS retained 19% water absorption compared to 5% for EPS after being buried below grade for 15 years.
What is XPS insulation used for?
XPS foam board is often used for above-grade insulation applications such as walls, ceilings, attics and roofs as well as for below-grade applications such as foundations and basements. When used above-grade, it can reduce thermal bridging and improve energy efficiency.
What is the R-value of 3 inch foam board?
This product typically has an R value of 3.6 to 4.0 per inch of thickness.
What is the thinnest insulation with the highest R-value?
Aerogel insulation offers the highest R-value of any insulating material at less weight and thickness—ideal for construction, refineries, pipelines, and thin-gap thermal barriers.
What is the most efficient house insulation?
Q. What is the most energy efficient wall insulation? Closed cell spray-foam insulation is the most energy efficient wall insulation. Applications can reach much higher R-values for each inch of thickness than other insulation products, with values as high as R-6.2 per square inch (roughly R-34 on a 2×6 wall).
Is R60 too much insulation?
Recommended R-Value Varies by State
You need exactly as much as the area you live in determines. Here, where temps get pretty hot for much of the year, attics should have from R30 to R60 (average is R38). Those living up north want anything from R49 to R60. This helps insulate against the extreme cold weather.
Does XPS insulation need a vapor barrier?
XPS is manufactured in both an unfaced form or with different plastic facings. However, XPS is considered a vapor retarder, not a vapor barrier.
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What happens when XPS gets wet?
How strong is XPS foam?
Products are available in a range of compressive strengths to meet different applications. XPS foam board can be manufactured up to 100 psi or more.
What material has highest R-value?
Vacuum insulated panels have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.
How thick is R60 blown?
between 19 and 22 inches
R 60: Thickness that oscillates between 19 and 22 inches.
How many inches of insulation do I need for a R60?
17 inches
The average recommended level is 17 inches of R60. In Zone 6, the average minimum requirement for attic insulation is 14 inches of R49 fill. The average recommended level is 17 inches of R60.
Does XPS absorb water?
Is XPS breathable?
Simply put, XPS is not breathable. It retains water over time. This is due to the way it’s produced with the beads being so tightly joined together, resulting in a much lower perm rating than GPS. So, a double vapor barrier is created when a layer of XPS foam board is placed on the exterior of a wall assembly.
Does doubling insulation Double R-value?
Doubling the thickness of insulation will double the insulation’s R-value, cutting heat loss in half. Each time the insulation layer is doubled in thickness, this rule applies.
What is the best R-value for attic?
Attics. The absolute minimum for attic insulation R-values across the country is R-30, with upper recommended ranges between R-49 and R-60 for zones 1 through 3.
Is XPS foam flammable?
While the code requirements for continuous insulation help to improve efficiency, they raise another challenge: the foam plastic insulations commonly used for continuous insulation—polyisocyanurate aka polyiso, expanded polystyrene also known as EPS, extruded polystyrene aka XPS and spray polyurethane foam or SPF—are …