May. 27, 2024
When constructing or renovating a high-performance building envelope, you’re likely to choose between three main types of rigid foam panels: Polyisocyanurate (Polyiso, PIR), Extruded Polystyrene (XPS), and Expanded Polystyrene (EPS). Although all three are petroleum-based, their properties and performance levels vary.
Our company is recognized as the world’s best xps panel factory supplier, offering specialized staff to help you find the products you need.
Before making a selection, you should clearly understand what you expect from these foam insulation panels to ensure you make the best choice. Each type has unique characteristics, performance capabilities, and ecological impacts.
Polyiso, also known as PIR, is a thermoset plastic product typically produced as foam. It is commonly used as a rigid thermal insulation panel, often featuring an aluminum foil facing. Polyiso's thermal performance is rated at R6-6.5 per inch, but this performance deteriorates significantly in cold temperatures, below about 15°C.
While many insulation products perform better in colder conditions, Polyiso is an exception. In temperatures below -20°C, it provides considerably less thermal protection, which can lead to moisture damage due to its low permeability.
Despite its limitations in cold climates, Polyiso is widely used in low slope, above-deck commercial roofing applications. It offers a high-strength facer and can be used with various roofing systems, including modified bitumen and built-up systems.
In colder climates, using Polyiso foam insulation may not be the best choice as it loses a significant portion of its thermal protection. For example, a study showed that a wall or roof assembly in Chicago using 2" Polyisocyanurate foam panels lost 30% more heat compared to the same assembly using 2" of EPS foam.
XPS foam panels, often known by the brand name Styrofoam, are rated at R5 per inch. Over time, they tend to off-gas, leading to a decrease in insulation performance, especially in below-grade applications. Above grade, XPS acts as a vapor retarder and can become even less permeable with increased thickness.
XPS foam has been found to retain moisture despite manufacturers' claims. This makes it less suitable for below-grade applications like basement insulation. It's better to use XPS above grade, where its insulative properties can be more effectively utilized.
Traditionally produced XPS uses hydrofluorocarbons (HFCs) as blowing agents, which are highly detrimental to the environment. However, newer versions manufactured by companies like DOW Chemicals are using more eco-friendly blowing agents.
EPS foam panels offer an R4 per inch rating and are more permeable to air and moisture compared to XPS. However, EPS’s higher permeability allows it to dry out quickly without retaining moisture.
While EPS has a lower R value than XPS, it offers a higher R value per dollar, making it a cost-effective insulation choice. EPS foam consistency in performance over time also makes it a reliable option.
For more details, you can visit the glass wool vs rockwool acoustic page for information.
Related links: How Does Biodegradable Plastic Work?
Polyisocyanurate foam insulation panels come with a layer of foil on each side. This foil acts as an excellent vapor barrier, eliminating the need for an additional vapor barrier on the interior of a high-performance wall design.
Polyiso’s blowing agents have a global warming potential similar to those used in EPS, making it an eco-friendlier choice in the right conditions. It’s particularly effective when kept above freezing temperatures and away from moisture.
Unlike petroleum-based foam products, mineral wool is made from recycled stone dust from industrial blast furnaces. It offers excellent R value, is fireproof, non-toxic, and does not off-gas harmful chemicals.
Mineral wool is ideal for retrofitting insulation in basements and other moisture-prone areas. It’s also preferred for its superior soundproofing and fire resistance properties. While it’s more expensive than fiberglass, mineral wool offers easier installation and better overall performance.
Our top recommendation, based on its recycled content and versatile applications, is mineral wool. For petroleum-based options, Polyiso is preferred in warmer climates, while EPS is excellent for below-grade applications. Despite its good performance, XPS’s environmental drawbacks place it last in our preference list. As XPS transitions to more eco-friendly agents, it will become a more viable option for above-grade use in green building.
If you want more information on industrial gases rubber foam, feel free to contact us.
Previous: How Does Biodegradable Plastic Work?
If you are interested in sending in a Guest Blogger Submission,welcome to write for us!
All Comments ( 0 )