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SKU: XTR-64088

Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 90mm (XT/CF/090/BD/RB01) In Stock

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£77.08
ex. VAT
£92.50 inc. VAT

Availability: 1-2 working days

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Free Delivery On Orders Over £500 Ex VAT
Free Delivery On Orders Over £600 Inc VAT

Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joint and pre-formed corners, ensuring insulation continuity and minimisation of thermal bridging. Cavity Wall (T&G) for use in traditional masonry walls, builds to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain.

 

The Xtratherm Thin-R Cavity Fill PIR Board is a premium thermal insulation board for masonry cavity walls, delivering high energy performance and long-term durability.
Each board features a tongue-and-groove joint for a tight interlock between sheets, reducing air gaps and ensuring consistent insulation throughout the wall build-up.

 

Its foil-faced PIR core achieves low thermal conductivity (approx. 0.022 W/m·K), helping achieve excellent U-values in both full-fill and partial-fill cavity wall constructions.
Lightweight, rigid, and easy to cut on site, this board provides superior moisture resistance and is ideal for new-build, retrofit, and extension projects where reliable insulation and rapid installation are key.

 

Manufactured with a low-emissivity foil facing, the Thin-R range delivers excellent thermal resistance while reducing heat loss through the wall cavity. Its rigid PIR core combines strength and moisture resistance, making it ideal for new-build and refurbishment projects seeking compliance with Part L energy targets.

 

 

Features and Benefits

  • High-performance PIR insulation board for cavity walls

  • Tongue-and-groove edges for gap-free, airtight fit

  • Low-emissivity foil facings enhance overall wall thermal resistance

  • Suitable for partial or full-fill cavity applications

  • Excellent moisture resistance and compressive strength

  • Helps meet Part L Building Regulation compliance

  • Compatible with blockwork and brick outer leaves

  • Lightweight and easy to handle on-site

  • Robust tongue and groove jointing

  • Corner panels & cavity closers: Reduced Thermal Bridging

  • Clear Cavity Maintained

  • No Exposure Restrictions

  • Low Emissivity Foil Facings
 

 

Equivalent/Related Products

  • Recticel Eurowall Plus 90 mm – Full-fill cavity PIR board

  • Celotex CW4000 90 mm – Partial-fill cavity insulation

  • Unilin XO/CF 90 mm – High-performance cavity PIR

  • Kingspan Thermawall TW50 90 mm – Cavity wall board with foil facing

Product Specifications

  • Brand: Unilin / Xtratherm
  • Category: Insulation
  • Family: Cavity Fill
  • Material: PIR Insulation
  • Range: Insulation Boards
  • Type: 90mm Insulation
  • Board Size: 1200 × 450 mm
  • Thickness: 90 mm
  • Core: Polyisocyanurate (PIR)
  • Thermal Conductivity: 0.022 W/m·K
  • Facing: Foil-faced (low emissivity both sides)
  • Edge Detail: Tongue & Groove
  • Applications: Masonry cavity walls, new builds, refurbishments, extensions

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Orders under £250 Ex VAT

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Orders between £250 - £500* Ex VAT

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Orders over £500 Ex VAT

DELIVERY CHARGES & DISPATCH

We offer tiered delivery pricing to keep things clear and transparent. Delivery charges are calculated based on your order total before VAT and will be shown clearly at checkout. We are a TRADE SITE built for larger orders with keen pricing to match.

  1. Orders BELOW £250 ex. VAT (£300 inc. VAT) --- £70 ex. VAT (£84 inc. VAT) delivery charge
  2. Orders FROM £250 to £500 ex. VAT (£300 to £600 inc. VAT) --- £50 ex. VAT (£60 inc. VAT) delivery charge
  3. Orders OVER £500 ex. VAT (£600 inc. VAT) --- Free delivery

if the charge is higher than this or your post code is coastal / hard to get to, it could be out of our delivery zone. Get in touch and we can assist. There are parts of the UK that we don't deliver to and this will be marked at checkout. (N Ireland and Scotish Highlands). If this occurs upon your checkout, please reach out the team and we will see what we can do via a 3rd party supplier.

Standard Dispatch Times

  1. Most items are dispatched within 2 to 5 working days.
  2. Custom or made-to-order products may require additional lead time.
  3. We do not deliver on weekends.

Orders must be placed by 1:00 PM Monday to Thursday to be eligible for next-day dispatch (where applicable). Orders placed after 1:00 PM on Fridays will be processed the following Monday. All products have the availability days marked, so use this as a guide.

PREFERED DELIVERY TIMES*

We offer this service to alleviate confusion for you and reduce communication for us all. It gives us an idea on when you would like the order to be delivered.

It is NOT a garaunteed delivery date. Picking next day WILL NOT get you next day - unless you pay for it.

We understand scheduling of larger materials to your project is important, thus having your preference is very helpful for us. Please note this works in tandem with the availability of the product. We can NOT fulfill any orders before the avability days set on the product, even if the date insert tool allows it.

There may be situations where if specified a preference date is given, we may not always be able to deliver on that date. We WILL do our best to comunicate accurate delivery times via email after the order is placed, so no need to worry.

After you specified a date we will do our best to deliver on that date, you will be notified within 24-48 hours if we can not fill that day but will strive to get a slot as close as possible to that date. We do not deliver on weekends, so all orders specified with weekend delivery will be shifted to the week after.

ON THE DAY & PRODUCT EQUIVALENTS

If you need to reschedule your delivery, let us know as soon as possible. You’ll be notified of any changes via email or phone. We can not change delivery dates if you leave it within 24 hours of confirmed booked date.

Someone must be on-site to sign for and assist with unloading materials. All deliveries are kerbside only. Upon delivery:

  1. Inspect goods before signing.
  2. If goods are damaged or incorrect, refuse delivery and contact us immediately leave goods with the dirver: Call: 02039916406 or Email: sales@londonbuildingsupplies.co.uk

Important: Signing a delivery as “unchecked” means the goods are accepted in good condition.

Responsibility for goods transfers to you upon delivery. We reserve the right to charge a failed delivery fee if access is restricted for the vehicle specified on the order, Redelivery charges are £50 ex vat. Collection charges are £50 ex vat

Every transaction is recorded, and the delivery fees are determined on whether or not the recipient is ready to receive the package. This covers manual or automated offloading of heavy items. Offloading equipment, such as a tail lift or forklift, may be requested; however, there may be an additional fee if the site is difficult to access or we have a parking / access restrictions or the products are of considerable size..

We may be forced to offer an equivalent high-quality substitute product at no extra cost to our customer from time to time give the UK market conditions and stock supply in your area. They will be like for like and be chose by you with the liability on person orders if chosen on the option to accept yes is marked.

RESTRICTED ACCESS

Our suppliers reserve the right to refuse to make a delivery, if you have not informed either us or the supplier of any access restrictions at either the time of placing the order or 24 hours before the delivery.

Restricted access includes, but is not limited to: double yellow lines, a red route, narrow lanes, steep hills, low bridges, or width restricted

At The Time Of Placing The Purchase Or 24 Hours Before Delivery. Delivery Will Be Managed With Below Partners Or 3rd Party Fulfilment.

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Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 90mm (XT/CF/090/BD/RB01)

Availability: 1-2 working days

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