Expanded polystyrene foam (EPS) is the cheapest and least used foam board product on the market. This product typically has an R value of 3.6 to 4.0 per inch of thickness. Expanded polystyrene insulation is similar to the foam used for packing “peanuts” and it’s typically used for insulated concrete forms also knows as ICF’s.
Foam Board Insulation – R Values and Types, What Is Expanded Polystyrene (EPS)? | Geofoam International, Expanded Polystyrene & R-Values – EPS Industry, R-Value | EPS Industry Alliance, For instance, if the specified insulation has an R-Factor of 3.8 and you are using 3.5 inches of insulation, the R-Value is 13.3. Thermal resistance (R) of a material is its resistance to heat flow, and R-Value is expressed as the reciprocal of the materials thermal conductivity.
8/7/2020 · EPS insulation has a typical R-value of 3.85 per inch at a mean temperature of 75 degrees Fahrenheit and a typical R-value of 4.17 per inch at a mean temperature of 40 degrees Fahrenheit.
7/1/2019 · EPS R-Value Thermal Performance. Another research project done by the EPS Industry Alliance was a 30-month exposure study. Here is an excerpt from the highlights of the study: “Testing confirmed that all types of EPS insulation retained their specified thermal and mechanical properties even after being subjected to in-situ freeze-thaw cycling.
The Connor study test results indicate a rapid drop in R-value per inch for EPS in the first five years in service (with in-service R-values per inch ranging from 3.13 to 3.70). By comparison, the R-values per inch for XPS only gradually dropped after five years in service on previously measured XPS samples (with R-values per inch ranging from 4.51 to 5.15).
One of the main reasons EPS is so effective when used as thermal insulation is its high R-value. The R-value refers to a material’s ability to resist heat flow. The thicker the sheet of EPS, the higher the R-value will be. When it comes to R-value, our polystyrene sheets outperform materials such as weatherboards, plasterboards, concrete slabs, fibre cement sheets and more. What’s more, EPS is resistant to water,.
Additional R-value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included, such as 1 solid foam (polyisocyanurate R 8, extruded polystyrene R 5, expanded polystyrene R 4, or 1 of perlite R 2.7) and for an exterior air film (winter, no wind, R 0.17), an interior air film (again no air movement, R 0.68), 3/4 of reflective air space (no.
Insulation. Expanded Polystyrene insulation like PolyFloor, PolyWall & PolyRoof have a K-Value of 0.035. R-Value Calculations. Thermal R-Values are calculated the dividing the thickness of the material (in meters) by the K-Value of the material.
The thermal conductivity of expanded polystyrene foam of density 20 kg/m 3 is 0.035 – 0.037 W/ (m·K) at 10 °C. ASTM C578 Standard Specification for Rigid Cellular Polystyrene Thermal Insulation addresses the physical properties and performance characteristics of EPS foam as it relates to thermal insulation in construction applications.
Thermal Conductivity, Thermal Insulation, Building Insulation, Building Insulation Materials, Heat Transfer
