60mm Insulation Board Thermal

A 60mm insulation board is commonly installed to improve thermal performance in buildings. The 60mm insulation layer slows heat flow through the building fabric, helping buildings move closer to current thermal performance targets.

What is 60mm thick insulation board?

A 60mm insulation board reduces heat transfer through the building fabric, without significantly impacting space or detailing. It is installed when thinner insulation is not enough, and using a thicker layer would mean altering the structural build-ups or finishes.

In many refurbishment works, thinner boards do not deliver enough thermal resistance to meet modern expectations. A 60mm board often provides an effective balance between performance and build-up depth and can support compliance with Part L requirements.

The exact performance of a 60mm board depends on the material. Phenolic, PIR, EPS, and XPS each offer different thermal, moisture, and strength characteristics.

What is 60mm insulation board thickness used for?

Insulation 60mm boards are used for:

• Internal wall upgrades during refurbishments
• Warm and cold roof constructions, typically as part of a layered build-up
• Floors where insulation must sit above or between joists
• Garage or outbuilding conversions where comfort is being improved

Because a 60mm insulation thickness board sits in a practical balance between thickness and performance, it is popular for projects that want a measurable thermal upgrade without reducing internal floor area excessively.

Types of 60mm insulation board

Common 60mm insulation board materials include:

EPS Insulation (Expanded Polystyrene)

EPS insulates by trapping air inside tiny beads. It is often used where cost matters and loads are low, such as floors, backing insulation layers, and some external wall insulation systems.

XPS insulation (Extruded Polystyrene)

XPS has a dense, closed-cell structure that prevents water from readily penetrating the material. It is often installed under floors or on roofs where moisture exposure and foot traffic are expected.

It has high compressive strength, so it resists compression under load.

Its thermal performance is not class-leading, but it is consistent – a lambda value of 0.029–0.034 W/m·K, which is suitable where durability and moisture resistance are prioritised.

PIR Insulation (Polyisocyanurate)

PIR boards offer strong thermal performance for their thickness. A standard 60mm insulation board made from PIR is commonly specified in walls, roofs, and floors where good performance is required with moderate thickness.

Phenolic Insulation Foam Board

Phenolic is often specified when you need to achieve better U-values, where increasing wall build-up depth is not possible.

It insulates extremely well for its size, with declared lambda values often around 0.020 W/m·K, which puts it ahead of most rigid boards.

This higher efficiency allows tighter thermal targets to be achieved within limited build-ups.

Kingspan Optim-R VIP (Vacuum Insulated Panel)

VIP boards use a sealed vacuum core. They deliver extremely high insulation levels, but must be cut to size at the factory and handled with care. They are used where space is extremely limited, and accuracy is critical.