Target thermal bridging and detail areas with the Sopratherm TB4000 PIR insulation board, supplied in a thin 2400 x 1200 x 25mm size. This high-performance rigid foam board offers excellent thermal performance with a conductivity of 0.022 W/m.K, helping to reduce the thickness of insulation needed to hit target U-values.

Equipped with low emissivity foil facings, the board improves thermal performance within sealed cavity air spaces. Soprema boards are engineered to be light and rigid, assisting with ease of transportation, site handling, and clean cutting.

Ideal for overcoming thermal bridging in construction detailing, this thin 25mm board is suitable for use in a number of applications including roof, wall, and floor systems. It has been assessed by the BBA as fit for use in defined building applications when installed according to certification guidelines.

• 2400 x 1200 x 25mm slim dimensions – designed specifically for detailing and overcoming thermal bridges
• 0.022 W/m.K thermal conductivity – delivers high thermal resistance in a compact profile
• Low emissivity foil facing – enhances heat retention inside sealed cavity air spaces
• Light and rigid build – simplifies manual handling, transporting, and fitting on site
• Versatile application – suitable for use across defined roof, wall, and floor systems
• BBA assessed – verified fit for use in certified construction structures
• Available in various thicknesses – including 20mm, 30mm, and 40mm

Delivery & Returns

Delivery: This item is delivered to the kerbside or the nearest accessible road point at your property. The driver won't be able to bring it into your property, so please make sure you can move it from there.

Due to courier restrictions, we're unable to deliver this item to the following postcodes:
Scotland: AB10–16, AB21–25, AB30–39, AB41–45, AB51–56, IV1–28, IV30–32, IV36, IV40–56, IV63, KW1–17, PA1–20, PA21–38, PA41–49, PA60–78, PA80, PH1–26, PH30–44, PH49–50
Wales: LD1–8, LL21–49, LL51–78, SA1–20, SA31–48, SA61–73, SY15–25

Returns: As this is a bulky item, unwanted returns incur a £40 collection fee (replacing our standard £9 fee). There is no charge for items that are faulty, damaged or sent in error. To arrange a collection, please contact our Customer Services team.

This item will be delivered directly by our supplier. Lead times are shown on the product and trolley pages and are always advertised in working days (Monday to Friday).

• If your order contains items stocked by us and items that come direct from the supplier, your order will be automatically split and processed accordingly.
• We will pass the details you give us, including delivery details, your email address and your phone number, to the relevant supplier.
• Most of our suppliers can deliver to any UK address. Delivery to remote or offshore postcodes may take a little longer than the advertised lead time. If the supplier cannot deliver to your postcode or we believe your order may take longer, we will try to tell you beforehand.
• Items that come direct from a supplier will be delivered by the courier chosen by the supplier. Where possible, suppliers will update you with delivery information. This may be by email, phone call or text message.
• Items delivered direct from suppliers cannot be returned through a store. You would need to return these items direct to the supplier, unused and in their original packaging, at your expense. You can arrange for most items to be collected by contacting our Customer Services team. A fee of £9* will be taken off your refund. There is no charge for faulty items being collected. *For big and bulky items, additional charges may apply.
• Please note, you cannot return bespoke or made-to-measure items unless they are faulty.