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Insulated Roofing Panel

Last modified: 2022-11-22 | Approximate reading time 4 mins

Cynthia Pigeon

Considering that buildings can lose up to a quarter of their heat by way of their roofs, and on top of that cold air can seep through an improperly insulated roof, it's easy to gauge the importance of opting for well-insulated roofing panels.

Insulating a sloped or flat roof using the right panels will help you optimize the structure’s energy efficiency, reduce its carbon footprint, as well as save money, prevent heat transfer, and improve your overall comfort during the summer. 

Since every building is unique, there are solutions more or less adapted to each situation, depending on the specifications of the roof in question and, of course, your budget.

Insulated Roofing Panels: Various Models

Overview of different types of insulated roofing panels 

PIR polyisocyanurate panels: These are made for both flat and sloped roofs, and this type of material is highly flame retardant, meaning its components were treated to withstand fire. However, installing this type of insulated roof panel can be tricky on solid structures and requires certain adjustments. Il will also necessitate foam insulation at the edges where the panels meet.

PUR polyurethane panels: This type of insulation is suitable for sloped or flat roofs. It already has a vapour barrier layer, making the installation of an additional vapour barrier layer on the surface of the roof unnecessary. However, correctly positioning the insulated panel is crucial: there should be no gaps between them. If so, add polyurethane foam where the panels appear to be vulnerable.

Mineral fibre insulation board: Mineral wool is suitable for flat or sloped roofs. It is made up of Rockwool, glass wool, and wood wool. Given its tendency to compress, mineral wool is less effective than PIR or PUR. Therefore, you'll need to increase the overall density to achieve the same degree of roof insulation as you normally would with the previously mentioned panels.

Overview of different types of metal panels 


Source: Pixabay - Pexels

Insulated metal steel panels: Suited for flat or sloped roofs. Steel metal panels are made of a non-load-bearing corrugated panel, which is then added to a hard thermal insulator, such as polyurethane, Rockwool, or glass wool. It's super easy to install, and these stand out on account of their ability to withstand mould and mildew growth. On top of that, they're considered to be a very good soundproofing material.

HR (HR3 & HR5) roof panels: More cost-effective than on-site assembled systems, these provide seamless thermal insulation and prevent any risk of interstitial condensation. These panels are very resistant and meet today's energy standards, unlike, for example, traditional roofing materials made from fibreglass. They're quick and easy to install, with unique, waterproof EPDM washers to secure the attachment to the standing seam while also preventing water infiltration. 

Standing seam (SR2) roof panel: Given their maximum impermeability, these zinc panels are especially suitable for regions in Quebec where the climate is harsh. And, they're particularly suitable for rounded or intricately-shaped roofs. 

A specific example of an insulation board: Isolex II

Isolex II is a closed-cell polyisocyanurate foam board, which is fully laminated to a heavy, durable, and dimensionally stable inorganic glass-coated panel. In Quebec, this roofing insulation board is available in various widths, thus offering thermal values ranging from R5.7 to 26.8. Its use is especially relevant for multi-layer, modified bitumen, and single-ply roofing systems. It's also available in several sizes. 

Features & Advantages 

High R-value: Polyisocyanurate is one of the best thermal insulators available on the market.

Dimensional stability: Isolex II has compressive strength, dimensional stability, and stable support panels that can withstand labour traffic during installation, can resist the weight of mechanical fasteners, and reduce thermal bridging.

Highly Compatible: Isolex II blends in perfectly with any type of roofing system, and is a key element in a fire-resistant roofing composition. It's also compatible with the adhesives and solvents generally used in construction.

Eco-friendly: Isolex II is a product that’s HCFC-free and safe for the ozone layer.

Furthermore, Isolex II boards have proven fire, compression, and moisture resistance. They’re fully approved by the Construction Code and are highly regarded by insurance companies, which offer cost-effective pricing to those who purchase them.

Bizolap Insulation Board: Type HR With Specifications


Source: Pixabay - Pexels

Bizolap is a sloped, expanded polystyrene roof insulation board that’s shiplapped on four sides. It is designed to insulate and drain flat or low-slope roofs. 

Features & Advantages

Monolithic panels: With up to 8" (203.2 mm) of thickness, this type of insulation board meets the required R-value for a residential home with just one layer. 

Waterproof: Since closed-cell foam is impermeable, water can only penetrate the channels between the polystyrene cells, which are sealed together.

High dimensional stability: According to industry standards, expanded polystyrene is the best material in terms of dimensional stability. It guarantees the same efficiency in terms of impermeability over time.

Captive gas (98% air and 2% plastic): It is free of gasses that could harm the ozone layer. This formula makes the roofing insulation board lightweight while also maintaining its R-value.

Eco-friendly product: EPS (expanded polystyrene) is 100% recyclable and contains 10% recycled materials. It’s also locally made, thus the travel distance between the factory and the construction site is minimal. 

Anti-mould: EPS is made from materials that don't support bacterial growth such as spores and fungi.

Meets high standards: Helps meet Novoclimat (in Quebec), EnergyStar (Ontario and Maritimes) and R-2000 (Canada) thermal insulation standards.

On top of that, Bizolap boards have 100% thermal resistance and a 35-year warranty (at no extra cost).  

Cover image source: Micah Carlson - Unsplash

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