Types of Foam Board Insulation & R Values
| Foam Board | R-Value/inch |
| Expanded Polystyrene (EPS) | 4.0 |
| Extruded Polystyrene (XPS) | 5.0 |
| Polyisocyanurate | 8.0 |
| Polyurethane | 6.5 |
What insulation has the highest are value?
- Aspen Aerogels Spaceloft – R:value per inch: 10.3
- Demilec HEATLOK SOYA 200 PLUS – R-value per inch: 6.0
- Styrofoam Boards – R-value per inch: 5.0
- ROCK WOOL Comfort Board 80 – R-value per inch: 4.2
- Owens Corning ThermaFiber UltraBatt (unfaced) – R-value per inch: 4.15
- ROCK WOOL Comfort Batt AND ThermaCork – R-value per inch: 4.0
Which insulation has the highest R-value?
Types of Insulation
- Rigid Foam or Panel Insulation. The type of insulation with the highest R-Values, with a few exceptions, is rigid foam or panel insulation.
- Foamed-in-Place. Also called “spray foam,” foamed in place is the newest type of insulation used in residences. ...
- Blanket: Batts and Rolls. ...
- Loose Fill. ...
- Structural Materials. ...
How do you determine the are value of insulation?
Insulation types with the highest R-value
- Closed-cell spray foam R-value: 6.5 per inch
- Mineral wool R-value: 4-5 per inch
- Cotton batts R-value: 3.5-4 per inch
- Open-cell spray foam R-value: 3.5 per inch
- Fiberglass batts and blankets R-value: 3.0-4.0 per inch
What is the best your value for insulation?
What is the Best R Value Insulation?
- Fibreglass insulation – this generally is sold in a long roll, or may be cut into lengths called batts. ...
- Foam Insulation – this is available in sheets of different thicknesses. ...
- Blown In Insulation – this kind of insulation is blown into walls or an attic to create a blanket of shredded material which works to eliminate heat loss through the ...
What is the R-value for 2 inch rigid insulation?
R-Value Chart for EnerfoilTM Rigid Foam Faced InsulationThickness (Inches)R-value (in I-P/Imperial)RSI (R-value in Metric)1.06.21.081.59.31.622.012.42.162.515.52.76 more rows•Dec 13, 2018
How many inches of rigid insulation is r30?
Typical R-30 fiberglass insulation is 10-inches-thick. Prior to buying fiberglass insulation, it is important to measure the joint spacing you are working with. Note that the actual space between the framing members will be less than 16 or 24 inches, but the foam batts can easily be stuffed between these lengths.Feb 12, 2018
What rigid insulation has the highest R-value?
The type of insulation with the highest R-Values, with a few exceptions, is rigid foam or panel insulation. Also called “foam board” or “continuous” insulation. Most varieties of this type of insulation consist of expanded foam sandwiched between two rigid panels.Sep 17, 2021
What is the R-value of 1 inch foam board?
This product typically has an R value of 3.6 to 4.0 per inch of thickness.
What is the R-value of rigid foam board?
Extruded polystyrene: Extruded polystyrene (XPS) rigid foam is usually blue or pink in color, with a smooth plastic surface. XPS panels typically aren't faced with other material. The R-value is about R-5.
What is the best R-value for attic?
Recommended insulation levels for retrofitting existing wood-framed buildingsZoneAdd Insulation to AtticUninsulated AtticExisting 3–4 Inches of Insulation1R30 to R49R25 to R302R30 to R60R25 to R383R30 to R60R25 to R383 more rows
What is the R-value of 2 inch foam board?
A wall utilizing STYROFOAM T-MASS Technology with a 2-inch exterior layer and a 4-inch interior layer of concrete along with a 2-inch layer of STYROFOAM extruded polystyrene insulation would result in a material R-value of approximately 11.33.
What is the R-value of 4 inch foam board?
Foam Board Insulation R-Value per inchThickness (in Inches)R-value (in I-P/Imperial)RSI (R-value in Metric)2.515.52.73.018.63.243.521.73.784.024.84.326 more rows
What is a good R-value?
Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
What is the R-value of 3 inch foam board?
Rigid foam R-values range from R-1 for 1/4-inch thick sheathing panels to R-15 for 3-inch thick panels. R-value is not entirely a function of the thickness of the material, as the facing material and type of foam used will affect the R-value of the material.Jan 28, 2022
What is the R-value of 3.5 inches of spray foam?
-3.5 to R-3.6 per inchOpen-cell spray foam absorbs and holds water. It has a lower R-value per inch than closed-cell foam and is vapor-permeable. The R-value is R-3.5 to R-3.6 per inch, so filling a 2×4 cavity yields about an R-13.
What is the R-value of 4 inch fiberglass insulation?
The R-value for fiberglass batts ranges from 3.1–3.4 per inch of thickness.Dec 25, 2021
What is R value of rigid insulation? - AskingLot.com
With both rigid foam and fiberglass, the R-values are mostly determined by the thickness of the insulating material. Fiberglass insulation packs in more R-value per cubic inch than rigid foam insulation does. Rigid foam R-values range from R-1 for 1/4-inch thick sheathing panels to R-15 for 3-inch thick panels.
R-values of Insulation and Other Building Materials - Archtoolbox
The values in the table above were taken from a number of sources including: the ASHRAE Handbook of Fundamentals, ColoradoENERGY.org, and Building Construction Illustrated by Francis D.K. Ching. Other minor sources were also used. Archtoolbox does not test materials or assemblies.
What Does R-Value Mean In Insulation?
R-value – thermal resistance – is basically how you put ‘how good insulator’ any material is in numbers. What ASHRAE actually measures (considerable research has been put towards this in the 50s and 60s) is thermal conductivity or k-value.
What R-Value Insulation Do I Need? (Attic, Walls, Etc.)
Insulation is almost always a smart investment. You want as high R-value materials as possible.
What is the R value?
R-Value isn’t just a time measurement though. It takes into account the size of the sample and the overall change of temperature over time, so that you can compare thermal conductivity of materials tested with plates of different temperatures, or even that were tested by other methods. The formula for R-Value is:
What does higher R value mean?
A higher R-value means that the insulation will do a better job of holding in conditioned air, whether that’s heat in the winter or cool air in the summer. It’s not about how much heat the insulation retains, but how slowly it allows heat to move through it. The slower, the better. Most insulation manufacturers will first list their insulation’s ...
What happens if you buy too much insulation?
How tightly your building is sealed against air leaks. If you purchase too much insulation, it may cost you more than what you’ll save on your utility bill. If you’re building a new structure, the amount of insulation you’ll need depends on your climate.
What does hr stand for in BTU?
In this formula BTU stands for British Thermal Units, hr stands for time lapse in hours, ft 2 stands for the exposed area of the sample in square feet and °F stands for change in temperature by degrees Fahrenheit.
What Is R-Value?
The R-value for insulation is a way to measure how much resistance the insulation has to heat flow. The higher the R-value, the more the resistance and the better the material is at insulating a home. Generally, insulation materials with higher R-values cost more when compared to those with lower R-values.
How Much R-Value Should My Insulation Have?
In many parts of the country, homeowners can get away with lower R-values for their insulation. Helpfully, the United States Department of Energy has a map that shows the recommended R-value range for different regions of the country.
How Do R-Values Compare for Types of Insulation?
If you are building a new home, there are a number of decisions to make about the insulation including what’s best for the floors, walls, crawlspaces and the roof. However, for the majority of people looking to improve the insulation in their existing home, the best place to look is upward to the attic.
Does a Higher R-Value Help With Tax Credits?
Effective through December 31, 2021, the federal government offered a tax credit of 10% material costs (up to $500) for the purchase of “typical bulk insulation products” used in an existing home that is your principal residence, and we expect the same for 2022.
About This R-Value Table
The following table provides typical R-values (and RSI) for various materials.
Check with the Manufacturer
When calculating the R-value for a real-life installation, always refer to the manufacturer’s data sheets for the actual, specific product you intend to use, or contact the technical department of the product manufacturer or material provider.
R-Value vs. RSI
R-value is used in the United States. RSI (R-value Système International ) is the metric equivalent.
R-Value and Energy Codes
Please note that the R-values for roof membranes, shingles, tiles, air films, and roof deck materials will probably not be permitted by your local code to be included when total roof assembly R-value is being calculated for the purpose of satisfying energy code requirements.
R-Value Chart
Note: While the R-Value for a material is typically given per inch, the RSI is typically given per millimeter, so please be aware that the R-Values and RSI values for the materials in the following table are not for equivalent thicknesses.
