80mm Insulation Board

An 80mm insulation board is a rigid thermal insulation used to reduce heat transfer through a building. This thickness is preferred when a project needs strong thermal control without jumping up to significantly thicker insulation systems. It is thick enough to make a meaningful difference, but still manageable to handle, fix, and detail on site.

What is 80mm thick insulation board?

An 80mm thick insulation board is a factory-manufactured rigid panel with a nominal thickness of 80mm across its full area. It works by trapping still air or low-conductivity gas within its structure, which restricts heat transfer through the wall, roof, or floor.

Because it is rigid, it keeps its shape once installed, helping to minimise gaps, sagging, and compression – all of which reduce performance.

These boards are commonly installed where energy targets are tighter, but space is limited – like refurbishments or upgraded new builds.

What is 80mm thick insulation board used for?

An 80mm insulation thickness board is used wherever heat loss needs to be controlled reliably through the building fabric. Its most common uses include:

• Internal wall upgrades where stud depth allows for thicker insulation
• Warm flat roof build-ups that require higher thermal resistance
• Pitched roofs between or over rafters, where permitted by the roof design
• Solid floors where insulation sits above or below the slab

It is usually selected when thinner boards do not meet the target U-value on their own.

Types of insulation 80mm board

Insulation Wholesale stocks 80mm insulation boards in these categories:

EPS Insulation (Expanded Polystyrene)

EPS insulates using trapped air. It is often chosen for floors or areas where cost efficiency is prioritised over maximum thermal performance.

XPS insulation (Extruded Polystyrene)

XPS is stronger under load and highly resistant to moisture. It is common in floors and inverted roofs.

Phenolic Insulation Foam Board

Phenolic foam offers very high thermal resistance relative to its thickness. It is often installed in tight spaces that demand high performance.

PIR Insulation (Polyisocyanurate)

PIR insulation boards are widely used on walls, roofs, and floors. An 80mm PIR insulation board – like the Kingspan 80mm insulation board – gives strong thermal performance and is easy to handle.

Insulation 80mm thickness board benefits

An insulation 80mm thickness board delivers several advantages, including:

• Strong reduction in heat loss
• Consistent thickness across the full area
• Faster installation compared to layered systems
• Predictable performance when installed correctly
• Works well with modern airtightness detailing

Why choose 80mm insulation boards from insulation wholesale?

Here is why our customers buy 80mm thick insulation boards online from Insulation Wholesale:

• We provide a straightforward, reliable purchasing process.
• We stock multiple durable boards from established manufacturers.
• Our team helps match products to site conditions.
• Our trade discounts and pallet deals keep large jobs cost-effective.
• We offer clear lead times with UK stock ready to move.
• Fast nationwide delivery direct to your site.