Pro-Foil Cavity Wall Insulation

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BEWI Pro-Foil Cavity Wall Insulation is a high-performance Partial-Fill and Full-Fill Cavity Wall insulation with improved thermal resistance.

Pro-Foil Cavity Wall board is an EPS board with a laminated air cushioned film and a reflective aluminium foil-facing. This provides a superior thermal resistance that lowers U-values enabling a reduction in cavity wall thickness.

The board also provides a higher vapour resistance and a rainwater barrier. It can be installed below DPC and contribrutes to the reduction of the thermal bridge at the junction of the ground floor and the external wall.

For further guidance refer to BS 5250: 2021 and Building Regulations.

          Key Features

  • KIWA Certificate BAW 22 258 P A UK
  • Declared Thermal Conductivity (λD) 0.030 W/mK
  • Suitable for partial-fill or full-fill cavity
  • Lightweight and easy to install
  • Acts as cavity rainwater barrier
  • Durable and rot-proof
  • Permanent insulation for the lifetime of the building
  • Can be installed below DPC level
  • 100% recyclable

 

 

Product specification
BEWI Pro-Foil is designed to be used in cavity wall construction. It combines the improved thermal conductivity of EPS and low emissivity of a foil (laminate of bubble foil and aluminium with reflective surface) to reduce U-values and therefore the building footprint can be reduced.

It also provides improved vapour resistance properties and acts as a cavity rain barrier.

Dimensions
Standard size: EPS – 1200 x 450 mm x required thickness

Reaction to fire:
EPS – Euroclass E
Foil – Euroclass E

Thermal Properties

EPS thermal conductivity 0.030 W/mK
Thermal resistance of the foil 0.12 m² K/W
Thermal resistance of the 10mm airgap
(To BS EN ISO 6946:2017		 0.365 m² K/W
Thermal resistance of ≥ 20mm airgap
(To BS EN ISO 6946:2017)		 0.713 m² K/W
Foil emissivity 0.03 declared

U-Values

Thermal Performance
The U-Value of 0.18 W/m² K can typically be achieved with a 105mm thickness of BEWI Pro-Foil in a partial-fill cavity Wall or in a full-fill cavity using 115mm thickness.
This is based on a common cavity wall construction using aerated blocks and 12.5mm plasterboard on dabs.
These U-values calculations are based on a typical wall construction of:

               102mm brick wall

               Residual Cavity

               Pro-Foil Cavity wall Insulation

               100mm Block wall (0.11W/mk)

               12.5mm plasterboard on dabs

 

 

Partial-Fill Cavity Wall Insulation
Regulatory Requirements Pro-Foil thickness U-Value W/m²K
ADL2021 – new dwellings 55mm 0.26
ADL 2021 – existing dwellings 105mm 0.18
2025 Future Homes* 145mm 0.15

 

Full-Fill Cavity Wall Insulation
Regulatory Requirements Pro-Foil thickness U-Value W/m²K
ADL 2021 – new dwellings 65mm 0.26
ADL 2021 – existing dwellings 120mm 0.18
2025 Future Homes* 155mm 0.15

* Proposed value for new and existing dwellings

Downloads — Pro-Foil Cavity Wall Insulation

BEWI Pro-Foil Wall Insulation Datasheet get_app
BEWI Pro-Foil Installation Guide get_app
KIWA Pro-Foil Cavity Wall Insulation get_app

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