Jablite is the UK's largest producer of EPS products for insulation and civil engineering applications



Jabfill Cavity Wall Insulation is a BBA-certified full-fill product that is designed to optimise the cavity space in a new build property.

Jabfill Cavity Wall Insulation will:

• Insulate for the lifetime of the building
• Eliminate cold bridging
• Prevent rainwater penetration
• Provide a flood-proof cavity wall insulation

Key Benefits
  • BBA (British Board of Agrément) accredited, certificate 96/3215.
  • Achieves A+ in the BRE Green Guide to Specification
  • Provide a flood-proof cavity wall insulation
  • Available for 100mm, 125mm and 150mm cavity widths
  • Lightweight and easy to handle
  • Tongue and grooved wall boards to prevent cold bridging
  • Vertical damp proof membrane corners meet BBA and NHBC requirements
  • 100% recyclable

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Downloads & Specifications

BBA Certificates and other supporting documents can be found in Technical Resources

Technical Resources
Technical information
Product specification

BBA (British Board of Agrément) Accreditation

Jabfill Cavity Wall Insulation is supplied to the standards defined in BS EN 13163 and has been assessed and approved by the BBA for use in cavity walls to a maximum height 12m; certificate number 96/3215.

Jabfill Cavity Wall Insulation is supplied in the standard board sizes of:

  • 450 x 1200mm (excluding tongues and edge detail)
  • 476 x 1219mm  (including tongues and edge detail)

The boards have 5mm-deep flutes on the external face which ensures that any moisture that penetrates the external leaf is directed down the outer face of the insulation and back into the external masonry.

Boards are marked to identify the correct orientation for installation.


Thermal Resistance (R value)

Jabfill Cavity Wall Insulation is moulded from HP or High Performance EPS (expanded polystyrene).

The thermal resistance or R-value of Jabfill Cavity Wall Insulation for the following standard thicknesses are:

75mm 2.19m2K/W
100mm 2.97m2K/W
125mm 3.75m2K/W
150mm 4.53m2K/W


Jabfill Cavity Wall Insulation is produced to the requirements of BS En 13163 ‘Thermal insulation products for buildings – Factory made products of expanded polystyrene (EPS) – specification’.

+Can Jablite EPS be used in a full fill cavity wall application?
Yes. Jabfill is designed for fully filling masonry cavities. Jabfill is tongue and grooved to prevent moisture transmission across the cavity. It also has an external profile that aids moisture run off and prevents insulation becoming damp.
+Does Jablite’s manufacturing process use a lot of energy?
No. Compared with other insulation materials, the manufacturing process uses only small amounts of energy as the Jablite EPS bead is expanded by steam.
+Does Jablite EPS include any recycled material?
Yes. Jablite standard products use between 0% and 60% recycled material depending on the grade, type of product and recycled material availability. The recycled material is from off site sources e.g. clean offcuts from building sites or from the manufacturing process - 100% of Jablite's manufacturing EPS waste goes back into the manufacturing process.