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50mm Celotex PIR Insulated Plasterboard 1200mm x 2400mm + 12.5mm P/B 2.88m2
50mm + 12.5mm Celotex PL4050 PIR Insulated Plasterboard is it is suitable for use in roof and internal wall lining applications. Celotex Insulated Plasterboard is a high performance, easy to install PIR insulation board with a paper facing, laminated to a piece of 12.5mm tapered edge plasterboard.
£52.64£63.17 Ex VATInc VAT£18.28£21.94 Per M2 Add to cart -
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1-20 21+ £58.03£69.64 £56.87£68.24 
50mm Mannok PIR Insulated Plasterboard 1200mm x 2400mm + 12.5mm P/B 2.88m2
Mannok Therm Laminate-Kraft / MLK PIR 50mm + 12.5mm PIR Insulated plasterboard is a high performance, fibre-free insulated board. Mannok Therm Laminate-Kraft / MLK PIR has a kraft paper facing on one side and plasterboard bonded to the other side.
£58.03£69.64 Ex VATInc VAT£20.15£24.18 Per M2 Add to cart -
62.5mm Kingspan Kooltherm K118 Insulated Plasterboard 2400mm x 1200mm Pack of 12 (34.56m2)
50mm + 12.5mm Kingspan Kooltherm K118 Insulated Plasterboard is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is an insulated plasterboard for mechanically fixed and adhesively bonded insulated dry-lining th a thermal conductivity of just 0.019 W/mK across all thicknesses.
£1,017.92£1,221.50 Ex VATInc VAT£29.45£35.34 Per M2 Add to cart
62.5mm Insulation Board
62.5mm insulation is a common internal upgrade supplied as an insulated plasterboard. It provides a significant improvement in thermal performance without requiring structural modifications.
It is designed to fit within typical internal lining build-ups and makes installing insulation simpler than installing insulation and plasterboard as separate layers. When installed well, the building stays warmer and more comfortable all year round.
What is 62.5mm Thick Insulation Board?
A 62.5mm thick insulation board is a bonded system made up of:
- A rigid PIR or phenolic foam insulation layer, typically 50mm deep.
- A plasterboard face, typically 12.5mm deep.
The insulation layer restricts heat transfer through the material to reduce heat loss in winter and limit heat gain in summer.
The plasterboard side of the panel gives a smooth, skim-ready lining. As a result, a separate plasterboard lining is not required. Because of this, a 62.5mm insulation thickness board reduces installation time compared to separate layers.
What is 62.5mm Insulation Board Thickness Used For?
The 62.5mm thickness insulation board is mainly used for internal wall insulation:
- When external insulation is not possible. (listed buildings or tight boundaries)
- When solid brick or block walls exhibit low internal surface temperatures.
- To improve comfort without changing the exterior of the building.
62.5mm thickness gives a noticeable improvement in U-values compared to thinner boards. It can contribute to U-value improvements of approximately 0.2–0.25 W/m²K, depending on wall construction and detailing.
Despite this thickness, it remains manageable around window reveals and services. This balance explains why 62.5mm insulation boards are common in housing upgrades where deeper insulation is often used elsewhere.
Types of 62.5mm Insulation Board
62.5mm insulated plasterboards are available in two main types:
PIR insulated plasterboard
PIR uses a closed-cell foam structure that resists heat flow very effectively for its thickness. An insulation board 62.5mm thick made with PIR is a good all-round choice for walls and ceilings where space is limited, but performance still matters.
It is lighter than many alternatives, easy to handle on site, and widely used in standard UK internal wall and ceiling detailing.
Phenolic foam insulated plasterboard
Phenolic foam is denser than PIR, for example, Kingspan K118 and performs better at the same depth. It is also more brittle, so take care when cutting or handling to avoid cracks.
FAQ
Where to buy a 62.5mm insulation board?
You can buy an insulation 62.5mm board online from Insulation Wholesale. If you need help choosing between board types or working out quantities, our sales team can assist. We work with trades every day, which means we offer trade discounts, pallet deals, and fast quotes when you are pricing a job. We also arrange fast nationwide delivery, including delivery to your site.
How to cut 62.5mm insulation board?
Cutting a 62.5mm insulation board is about accuracy:
- Measure twice and mark clearly on the plasterboard face.
- Score the board with a sharp knife.
- Snap the board, then cut through the insulation layer.
- Trim the back face if needed for a tight fit.
How to fix 62.5mm insulation board?
An insulation board 62.5mm thick is usually fixed internally using one of two methods:
- Adhesive dabs onto masonry, followed by mechanical fixings once cured.
- Mechanical fixings only, especially on uneven or weaker backgrounds.
Fixings should be long enough to pass through the insulation and securely anchor into the substrate.
Follow the recommended fixing pattern to prevent the plasterboard from tearing.
Joints are taped, skimmed, and finished like standard plasterboard.
