Type I EPS Technical Data
For decades, Benchmark Foam has been built on the idea that a product can only be considered truly effective if it consistently delivers on its promises. Our Type I Expanded Polystyrene (EPS) insulation is a testament to this philosophy. It is a cost-effective, durable and energy-efficient solution engineered for a wide array of insulation applications, from residential attic insulation to commercial roofing systems and perimeter insulation. We adhere to rigorous industry standards like ASTM C578, but our dedication to quality means we often exceed these benchmarks, setting a new standard for performance and customer satisfaction in the industry.
Performance and Properties of Type I EPS
Our Type I EPS is characterized by its balanced profile of thermal efficiency and mechanical strength. The following table details its key physical properties as defined by standardized test methods.
Downloadable data sheet
Thermal Performance (R-Value and k-Value)
The insulation efficacy of Type I EPS is measured by its R-value (thermal resistance) and k-value (thermal conductivity), tested in accordance with ASTM C518. This standard uses a heat flow meter apparatus to measure how well a material resists heat flow under steady-state conditions, providing you with dependable performance data. It is important to note that R-value can vary with temperature; for residential construction, the R-value at 75°F is typically used for calculations.
Understanding the Key Properties
Strength and Durability in Application
The strength of EPS foam depends on how dense it is. Our Type I EPS has a strength of 10 psi, which makes it a good choice for jobs with light pressure, like walls or under certain roofs. It’s flexible enough to handle a building’s normal shifting without cracking the walls or finishes.
Moisture Management and Breathability
The closed-cell structure of Type I EPS naturally resists moisture. This significantly reduces water absorption and helps to prevent mold growth. While it is not a vapor barrier, its structure allows it to “breathe.” This breathability is a major advantage, as it eliminates the need for costly venting that other insulation materials might require. It helps prevent moisture accumulation within wall and roof assemblies, supporting a healthy and durable building environment. The water vapor permeance, tested via ASTM E96 methods, measures this vapor flow through the material.
Fire Safety and Flammability
Like many construction materials, EPS is combustible and must be installed with appropriate safeguards as outlined in all current model building codes. The Oxygen Index test (ASTM D2863) measures the minimum concentration of oxygen required to support flaming combustion, providing a measure of the material’s relative flammability under controlled laboratory conditions.
Important Safety Note: This test does not indicate how the material will perform in a real fire. When exposed to high heat, EPS will not continue to burn on its own; it will melt away.
Long-Term Stability and Protection
In order to maintain its integrity and performance, EPS should be covered or finished when prolonged exposure to sunlight is expected because ultraviolet (UV) radiation can cause surface dusting or discoloration.
Our Dedication to Your Project’s Success
Since 1988, our name “Benchmark Foam” has represented our goal to set the standard by which other companies in our industry are measured. We are serious about our customers, our products and our promises. Our team diligently strives to surpass our own standards every day.
Let us help you select the right material for your next project. Contact Benchmark Foam today to get started.