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55mm Thermawall TW50 Kingspan PIR Cavity Wall Insulation ǀ pack of 9

55mm Kingspan Thermawall TW50 PIR PARTIAL FILL CAVITY WALL INSULATION (pack of 9)
55mm Kingspan Thermawall TW50 PIR PARTIAL FILL CAVITY WALL INSULATION (pack of 9)
55mm Kingspan Thermawall TW50 PIR PARTIAL FILL CAVITY WALL INSULATION (pack of 9)
55mm Kingspan Thermawall TW50 PIR PARTIAL FILL CAVITY WALL INSULATION (pack of 9)
55mm Thermawall TW50 Kingspan PIR Cavity Wall Insulation ǀ pack of 9
  • Low emissivity foil facings
  • Easy to handle and install
  • Thermal conductivity 0.022 W/m.K
  • BBA Certificate 14/5133
  • Non–deleterious material
Estimated delivery:
In Stock
£ 119.88
Ex VAT: £ 99.90
  • Brand: Kingspan®
  • Model: 55mm TW50
  • Dimensions: 1,200mm x 450mm x 55mm
  • SKU: 55mm
  • Product code: P1-1130
  • MPN: 55mm TW50 Thermawall

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55mm Kingspan TW50 Thermawall Cavity Wall Insulation Board is a rigid thermoset polyisocyanurate (PIR) board designed for partial fill masonry cavity walls.

Thermawall TW50 is a stable and rot proof insulation board used in newbuild or extension projects and will remain effective for the life span of the building.

With Kingspan 1200mm x 450mm x 55mm cavity wall insulation board a clear cavity is maintained and resistant to moisture penetration.

Kingspan Thermawall TW50 range is a non-deleterious PIR material with a certified thermal conductivity (lambda value) of 0.022W/mK.

TW50 Kingspan is a lightweight, easy to handle and install cavity wall board which can be readily cut by bricklayer using a sharp knife.

Thermawall TW50 is faced on both sides with a low emissivity composite foil, autohesively bonded to the insulation core during manufacture.

This reflective, low emissivity aluminium foil surface improves the thermal resistance of any unventilated cavity adjacent to the TW50 board.

The insulation core and facings used in the manufacture of Kingspan Thermawall TW50 resist attack by mould, fungi, bacteria and microbial growth.




Thickness: 55mm

Width: 450mm

Length: 1200mm

Board coverage: 0.54m2

Pack coverage: 4.86m2

Density (Foam Core): 32Kg/m3

Thermal Conductivity: 0.022 W/mk

R-Value: 2.50m2K/W

Commpressive Strength: >125 (kPa)

Water Vapour Resistivity: >100 MNs/gm


Key points:

 · Unaffected by air infiltration.

 · Easy to handle and install.

 · Non-deleterious material.

 · 1200mm x 450mm size boards.

 · Thermally efficient Polyisocyanurate (PIR) core.

 · High performance rigid thermoset insulation.

 · Lambda (thermal conductivity) value of 0.022 W/mK.

 · Clear cavity is maintained - resists moisture penetration.

 · Low emissivity foil facings significantly increase the thermal resistance of the cavity.

 · Meets NHBC technical requirements when used with a 50mm residual cavity.


Please note, 55mm Kingspan PARTIAL FILL CAVITY Thermawall TW50 is not available 



*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 


*Special Product - Non returnable cancelable.

Board covarage 4.86 m2
Commpressive Strength 125 (kPa)
Length 1200mm
Material PIR (polyisocyanurate)
Profile Square Edge
R-Value 2.50m2K/W
Thermal Conductivity 0.022 W/mk
Thickness 55mm
Water Vapour Resistivity 100 MNs/gm
Width 450mm
Vapour Resistivity 100 MNs/gm
Shipping method Articulated Vehicle
Applications Cavities ǀ Masonry Walls
BBA Certified Yes (no. 14/5133)
Foil faced Both sides
ETA Notification Yes
Features Fibre-free Rigid PIR foam core
Manufacturer Kingspan Thermawall TW50®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
55mm Kingspan Thermawall TW50 PIR PARTIAL FILL CAVITY WALL INSULATION (pack of 9)
55mm Thermawall TW50 Kingspan PIR Cavity Wall Insulation ǀ pack of 9
£ 119.88