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110mm Celotex XR4110 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
110mm Celotex XR4110 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
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Our specialist stores
Our specialist stores
110mm Insulation Board Thermal XR4000
The 110mm insulation board is a rigid thermal insulation panel used to significantly reduce heat loss in building envelopes. It is specified where sufficient construction depth is available to accommodate a high level of insulation.
A 110mm rigid board is often installed to meet tight U-values for walls, roofs, and floors. It is suitable for refurb projects, extensions, and high-spec new builds with tight thermal performance goals.
What is 110mm thick insulation board?
A 110mm thick insulation board is a factory-manufactured rigid panel with a fixed depth of insulation running across the full board. Unlike mineral wool, it does not compress or lose dimensional stability over time. When fitted correctly, its thermal performance remains stable over its service life.
Most 110mm rigid panels are made from closed-cell foam, where gas trapped within millions of tiny sealed cells slows heat transfer.
Most boards are supplied with square or profiled edges, designed to be cut accurately and installed tightly so heat cannot leak through gaps. At this thickness, correct jointing, fixing methods, and vapour control detailing become increasingly integral to overall performance.
What is 110mm insulation thickness board used for?
A 110mm insulation thickness board is used where thinner boards would not meet spec, including applications like:
- Framing walls – Timber or steel stud walls that need strong thermal insulation without relying on deep cavities.
- Internal masonry walls – Often installed on timber battens to accommodate the board and internal lining.
- Floors – Solid or suspended floors where downward heat loss is a problem.
- Pitched roofs – Between, below, or over rafters to achieve low design U-values.
- Flat roofs – Warm roof systems where thickness is planned into the build-up.
- Cladding systems – Behind rainscreen or external finishes.
At this thickness, insulation makes a significant contribution to reducing energy demand and improving internal comfort year-round.
Types of 110mm insulation board
Insulation Wholesale stocks two main rigid boards at 110mm depth:
PIR Insulation (Polyisocyanurate)
PIR is the most common choice. It offers strong thermal performance for its thickness and is easy to handle. Foil facings can assist with airtightness when joints are taped and detailed correctly.
Phenolic Insulation Foam Board
Phenolic boards insulate slightly better than PIR at the same thickness. That means marginally lower U-values. They are more brittle, however, and usually cost more.
PIR and phenolic foam are both rigid and built for long-term use.
At Insulation Wholesale, you can purchase 110mm Insulation Board at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
What are the common materials used in 110mm rigid insulation?
PIR or phenolic foam are the two materials used to make many 110mm thickness insulation board products. Both are rigid, with closed cells, and they are built to resist heat flow, moisture absorption, and long-term degradation.
What is the R-value of a standard 110mm insulation board?
It depends on the material.
- PIR at 110mm typically provides an R-value in the region of 4.8 m²K/W
- Phenolic foam at 110mm typically provides an R-value in the region of 5.3- 5.5 m²K/W
For compliance work, always refer to the declared thermal conductivity (λ-value) and calculated U-value.
How to fix 110mm insulation board?
- Walls – Apply mechanical fixings through battens or directly into masonry.
- Roofs – Fix between rafters using retention clips, or over rafters as part of a warm roof.
- Floors – Lay the boards over a prepared slab or between joists, fully supported and in accordance with the floor build-up design.
Follow the fixing pattern recommended by the manufacturer, and control air movement with taped joints.
Can you cut 110mm insulation board?
Yes. Using a fine-tooth saw or an insulation saw, cut slightly oversize, then trim back for a tight fit. Score-and-snap does not work well at this depth.
Where to buy 110mm insulation board?
You can buy a 110mm insulation board online from Insulation Wholesale. Our store offers low wholesale pricing, with clear stock availability. If you need your boards supplied promptly, you can order 110mm insulation board for next-day delivery to your site or home.
