EcoTherm Eco-Cavity Wall Insulation Board is a foil-faced PIR board designed for partial-fill cavity wall insulation in new builds and extensions. It offers a high thermal performance with a conductivity of just 0.022 W/m·K. The board is lightweight, easy to handle, and helps reduce thermal bridging in masonry wall construction. Each board measures 1200mm x 450mm and covers approximately 0.54m². At 90mm thickness, the board weighs around 1.86kg (1860g), offering excellent strength-to-weight efficiency in installation.

Key Features

Akor
Insulation

EcoTherm Eco-Cavity Wall Insulation Board is a foil-faced PIR board designed for partial-fill cavity wall insulation in new builds and extensions. It offers a high thermal performance with a conductivity of just 0.022 W/m·K. The board is lightweight, easy to handle, and helps reduce thermal bridging in masonry wall construction. Each board measures 1200mm x 450mm and covers approximately 0.54m². At 90mm thickness, the board weighs around 1.86kg (1860g), offering excellent strength-to-weight efficiency in installation.

Key Features

Akor
Insulation
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EcoTherm Eco-Cavity Wall Insulation Board (1200mm x 450mm)

£13.07
Foil-faced PIR cavity wall insulation. Compact 0.54m² board. λ = 0.022 W/m·K. Lightweight and certified to BS EN 13165.

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EcoTherm Eco-Cavity Wall Insulation Board is a foil-faced PIR board designed for partial-fill cavity wall insulation in new builds and extensions. It offers a high thermal performance with a conductivity of just 0.022 W/m·K. The board is lightweight, easy to handle, and helps reduce thermal bridging in masonry wall construction. Each board measures 1200mm x 450mm and covers approximately 0.54m². At 90mm thickness, the board weighs around 1.86kg (1860g), offering excellent strength-to-weight efficiency in installation.

Key Features

  • Thermal conductivity: λ = 0.022 W/m·K
  • Foil-faced PIR insulation board for partial-fill cavities
  • Lightweight and easy to cut on-site
  • Compatible with masonry wall construction
  • Dimensions: 1200mm x 450mm – covers 0.54m²
  • Average weight (90mm): 1860g
  • Compressive strength ≥140 kPa
  • Reaction to fire: Euroclass F
  • Vendor: EcoTherm
  • Datasheet

Description

EcoTherm Eco-Cavity Wall Insulation Board is a foil-faced PIR board designed for partial-fill cavity wall insulation in new builds and extensions. It offers a high thermal performance with a conductivity of just 0.022 W/m·K. The board is lightweight, easy to handle, and helps reduce thermal bridging in masonry wall construction. Each board measures 1200mm x 450mm and covers approximately 0.54m². At 90mm thickness, the board weighs around 1.86kg (1860g), offering excellent strength-to-weight efficiency in installation.

Key Features

  • Thermal conductivity: λ = 0.022 W/m·K
  • Foil-faced PIR insulation board for partial-fill cavities
  • Lightweight and easy to cut on-site
  • Compatible with masonry wall construction
  • Dimensions: 1200mm x 450mm – covers 0.54m²
  • Average weight (90mm): 1860g
  • Compressive strength ≥140 kPa
  • Reaction to fire: Euroclass F
  • Vendor: EcoTherm
  • Datasheet

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Engineered for Cavity Walls

EcoTherm Eco-Cavity Wall Insulation Board is designed for partial-fill masonry cavity walls. The foil-faced PIR core improves thermal resistance while maintaining a compact board profile. It offers reliable insulation where cavity space is limited.
The foil-faced PIR core delivers consistent thermal resistance while maintaining a slim profile. It fits securely between wall ties, reducing cold spots and improving long-term cavity performance.

Proven Thermal Performance

The board provides a thermal conductivity of just 0.022 W/m·K. Its closed-cell PIR core and reflective foil surfaces help meet Part L energy targets in residential and commercial construction.

Sustainable and Durable

This board is built to last, with strong compressive resistance and low water absorption. It supports long-term building fabric performance and contributes to energy-efficient design without compromising structure.

Compact Coverage

Each board covers 0.54m² and is easy to install in tight or narrow cavity spaces. Its small format improves fit in challenging layouts and reduces wastage during installation.

Compliant and Certified

Manufactured in line with BS EN 13165 and certified by the BBA, this product meets key UK building regulations. Suitable for residential and non-residential builds.

Our customers tell it better than we do!

Excellent 4.3 / 5
based on 983 reviews

Excellent Delivery Service

Order arrived early in morning, delivery staff were excellent and able to place order as close as possible to where I required it. excellent communication through out delivery and after delivery.

Rod Craik – 05 June

Great Experience

Great experience Really pleased with the way my order was dealt with and delivery arrived as advised.

Jim Brown – 23 May

Good product and service

Good product, reasonable price, great service and good customer follow-up. Would recommend and use again.

Gary Davies – 05 June

Great Company

Great company, great product. Delivery was very speedy and items was delivered professionally by a very helpful driver. Would highly recommend.

David Barrow – 27 May

Great quality wood and fast delivery

Great quality wood and fast delivery The company reached out to make sure that everything was good and the delivery went fine

Stephen Moseley – 31 May

Excellent service from a great company

Ordered 2T of midnight blue slate chipping (2 pallets of 50 bags each) Very nice product at a great price. Contacted quickly after order to arrange a suitable delivery date. Delivery was as arranged. Customer service is excellent including follow up call to ensure everything went well. All in all I would highly recommend Armstrong Cheshire.

Derrick Lohmann – 31 May

Great Customer Relations

Due to a mistake in communication ( mostly my mistake) the first delivery of bulk aggregate went to an address I used to live at. After asking to have a replacement delivery to the correct address Armstrong Cheshire re-scheduled the delivery within 3 days and with fantastic customer relations. I cannot recommend this company enough.

DAVID WHARTON – 20 May

Ultra Fast Delivery

Ultra fast delivery, technically superlative company, their products are light years ahead of all others. Unbelievable prices. I have been in construction for nearly 70 years now and am still working every day. This company is why I keep getting up in a morning. Thank you dear sirs/ Madam for making life easier

Anonymous – 16 June

Steel Lintel

Easy to pick product online, said 10 days delivery but got the product in 4 days, excellent service and prices

Mr. Ian Humphreys – 20 June

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