Insulation Board By Thickness

Insulation board by thickness focuses on picking the right board depth for each application, rather than focusing solely on brands or materials. This category allows you to compare insulation thicknesses side by side. This makes it easier to choose insulation that fits each space and gives the performance required for the build.

What is insulation board thickness?

Insulation board thickness means the insulation board’s actual depth. Thickness is especially useful when space is limited or where drawings specify a precise insulation size.

This category groups insulation boards by different thicknesses. Browse the listed products and compare options like 25mm, 50mm, 75mm, 100mm, and above in one place.

What are the different insulation board thicknesses used for?

Different insulation board thicknesses are suited to different parts of a building and performance requirements.

Thinner insulation boards (15–42.5mm)

Best for internal wall lining and within floor build-ups where space is limited. Also used to upgrade insulation without moving windows or doors. They enhance thermal performance without major changes to the structure.

Mid-range boards (50–100mm)

Ideal for walls, floors, and roofs. Often used in refurbishments and extensions where a balance between thermal performance and build-up is required.

Thicker insulation board options (110–200mm)

These thicknesses are preferred for roofs and external walls. Thick insulation boards provide stronger resistance to heat loss, helping meet current UK Building Regulations and energy-efficiency targets.

Benefits of choosing the right insulation board thickness

Varying insulation thicknesses give builders and homeowners great flexibility when upgrading or designing a property.

For instance, older homes were not designed with modern insulation in mind. Being able to choose thinner or mid-range boards makes it possible to upgrade spaces without major disruption to the existing structure. On the other hand, new builds benefit from thicker options that maximise energy efficiency from day one.

Different thicknesses also help balance:

• Thermal performance – how well heat transfer is slowed.
• Available space – what will physically fit.
• Cost control – thicker is not always necessary for every area.

It becomes easier to combine a range of insulation board thicknesses across a project so you do not over-insulate one area and under-insulate another.