80mm Insulation

80mm insulation is a mid-range depth specified when you need solid thermal performance but have limited space. It sits neatly between thinner internal linings and deeper structural insulation systems, making it common in refurbishment work and controlled build-ups.

What is 80mm Thick Insulation?

80mm thick insulation means that, when installed, the material dimension from face to face is 80 millimetres.

At this depth, insulation works by trapping still air (in soft products) or slowing heat flow through dense foam (in rigid boards).

The 80mm insulation thickness provides a meaningful reduction in heat loss. But it is also thin enough to fit between many common studs, joists, and lining systems without interfering with services.

What is 80mm Thick Insulation Used For?

Insulation 80mm thick is used where space is limited, but thermal performance is still required:

• Internal wall linings during refurb work
• Timber frame walls where the stud depth is fixed
• Warm roof build-ups above rafters, often as part of a layered insulation system
• Floors where the build-up height is restricted
• Acoustic upgrades that also require improved thermal performance

It is not the thickest option, but it is often the maximum practical thickness permitted by the construction detail.

Types of Insulation 80mm

There are two broad families at this depth:

80mm soft insulation

Soft 80mm insulation can be mineral wool or glass wool. It is flexible, air-filled, and tolerant of minor dimensional variation. Best for stud walls, joists, and sound control. Typical thermal conductivity values range from 0.032–0.040 W/m.K, depending on product grade.

80mm hard insulation

Rigid insulation boards at 80mm thickness include PIR, phenolic, EPS, and XPS. These rely on dense foam and closed cells. They deliver higher thermal resistance per millimetre, with typical thermal conductivity values between 0.022–0.030 W/mK. However, they require accurate cutting and tight jointing.

Both types can help meet Part L requirements when properly specified and installed.

Insulation 80mm Thickness Benefits

Using insulation 80mm thickness offers clear advantages:

• Significant thermal improvement without excessive build-up depth
• Easier detailing around windows and services
• Reduced risk of cold bridging than thinner insulation layers, when detailing is correct
• Works well in upgrades, not just new builds
• Can deliver both thermal and acoustic value

Why Choose Our 80mm Insulation?

At Insulation Wholesale, we supply insulation solutions matched to real construction details. We supply proven 80mm soft insulation and 80mm hard insulation options from trusted UK manufacturers, and our team understands where each is most suitable. If something will not suit your wall, floor, or roof, we will advise accordingly and recommend a more suitable alternative.

If you are working to tight dimensions but still want real thermal performance, 80mm insulation is a practical and effective choice. Browse our range online or speak with our technical team. We will help you get the thickness right before you order.

FAQ

Where to buy 80mm insulation

You can buy 80mm insulation online from Insulation Wholesale. We stock multiple material types and popular thicknesses and offer competitive trade pricing. Our store is built around fast delivery, clear product info, and real support from people who know insulation beyond the datasheet.

How to cut 80mm insulation

Soft products: Use a long insulation knife or saw, and cut slightly oversize so it friction-fits.

Rigid boards: Score deeply along a straight edge, then snap or saw for clean edges.

How good is 80mm insulation?

80mm insulation can deliver R-values of roughly 2.0-3.6 m²K/W, depending on the material. However, it must be installed properly to achieve this range of values. This represents a substantial reduction in heat loss relative to the thickness used. It will not replace thicker insulation, but it delivers strong performance relative to its thickness.