Each option offers unique advantages, but which one is best suited for your needs? Today, Beesley and Fildes will compare the properties of each to help you make an informed decision.

What is PIR Insulation?

PIR insulation is a highly effective rigid board produced by a chemical reaction between an isocyanate and a polyol.

This closed-cell foam structure is used extensively in construction to enhance thermal performance and energy efficiency. It significantly reduces water absorption and is resistant to moisture, preventing mould growth and water damage.

PIR boards are also known for their superior fire resistance.

What is Multifoil Insulation?

Multifoil insulation is composed of several layers of foam, wadding, and reflective foil.

This is incredibly adaptive, and its unique combination of layers results in a thin yet highly effective insulating material.

Unlike traditional bulk insulation, multifoil functions by reflecting radiant heat instead of only retaining air. This offers a great solution for energy efficiency by preventing heat loss by radiation, conduction, and convection.

Comparing PIR and Multifoil Insulation

Now that we’ve discussed the characteristics of each, let’s compare the benefits of PIR and multifoil insulation to help you make the right choice for your project.

Feature	Multifoil Insulation	PIR insulation
Thermal Efficiency	Effective at preventing heat loss through conduction, convection, and radiation, but may require additional layers to achieve higher insulation levels (R-values).	Superior R-value per inch, providing excellent thermal resistance with minimal thickness.
Installation	Lightweight, flexible, and simple to cut and install, ideal for DIY and quick installations.	Rigid boards can be difficult to cut, requiring precision; they create dust and need careful fitting.
Cost	Generally cheaper upfront and reduces labour costs due to easier installation.	More expensive due to advanced manufacturing and superior thermal performance.
Durability	Effective over time but may need additional layers or maintenance depending on the application.	Long-lasting with stable performance, reducing the need for replacement over time.
Space efficiency	Its thin profile makes it ideal for projects with limited space, such as retrofits and loft conversions.	Needs more space due to thickness but provides high thermal efficiency for compact applications.
Environmental impact	Often made from recycled materials, this has a low environmental impact during installation.	Efficient in energy saving but involves complex chemical processes during manufacturing.
Versatility	Suitable for a range of applications, including roofs, walls, floors, and conservatories.	Used across various applications like roofs, walls, floors, and ceilings for structural support.

Which Insulation is Right for You?

PIR Insulation is the ideal option if you value great thermal efficiency and are prepared to pay more upfront for a longer-term solution.

However, multifoil insulation might be a better choice if you're searching for a reasonably priced, simple-to-install, and adaptable solution that can function effectively in a variety of situations.

Discover the Perfect Insulation for You with Beesley and Fildes

Whether you're seeking the space-saving advantages of multifoil insulation or the enhanced thermal performance of PIR insulation, we’ve got you covered.

Explore our wide selection of insulation today, and browse our wide variety of building tools and materials, perfect for your next project.