Atlas Polyiso

frequently asked questions

Why do architects choose EnergyShield® over other rigid insulations?

EnergyShield® offers a strong combination of high R-value, thin profile, system compatibility, and product variety, allowing designers to tailor insulation solutions to specific wall assemblies and project requirements.

Does polyiso insulation perform poorly in cold temperatures?

No — this is a common myth. Polyiso does not stop working in cold weather. This misconception comes from how insulation is compared in laboratory testing. Polyiso’s published R-value is measured at a mean temperature of 75°F (24°C), but real wall assemblies experience a range of temperatures, not a constant cold condition. When used as continuous insulation (ci) in exterior wall assemblies, polyiso performs effectively across seasonal conditions. Products like Atlas EnergyShield® are widely used in cold and mixed climates, including throughout Canada, and are accepted by building codes and design professionals.

How long can EnergyShield® be exposed during construction?

Exposure limits vary by product. EnergyShield Pro and Pro Plus are designed for extended exposure during construction, while standard boards should be covered within the manufacturer’s specified timeframe.

What cladding systems are compatible with EnergyShield®?

EnergyShield® is compatible with a wide range of cladding systems, including rainscreen assemblies, masonry veneer, metal panels, fiber cement, EIFS, and stucco.

What is the difference between foil-faced and glass-faced EnergyShield products?

Foil-faced boards provide maximum thermal performance, while glass-mat faced products (EnergyShield CG, Pro, Pro Plus) offer improved durability, dimensional stability, and compatibility with adhered air barrier systems.

What type of insulation is EnergyShield®?

EnergyShield® is polyisocyanurate (polyiso) rigid foam insulation, which is a closed-cell foam with a high R-Value (typically 6.0-6.5) per inch compared to many other rigid or batt insulation types.

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frequently asked questions