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Retrofit Eaves Insulator

Patented solution for combating damp and mould at the eaves detail

Key Facts:
  • Ensures excellent insulation up to the wall plate.
  • Maintains 25,000 mm2 ventilation area at the eaves detail as required for cold lofts.
  • Minimises thermal bridging at the eaves detail.
  • Reduces the psi-value and improves the thermal performance of a property.
  • Warmer internal walls reduce condensation and the risk of damp and mould formation.
  • Innovative design ensures fast and easy installation.
  • Variable widths suit all commonly found rafter spacings.
  • Patented hinge means the REI is suitable for all roof pitches.
  • Suitable for any existing building with a pitched roof, an eaves space and ventilation at the soffit or eaves where access to the wall cavity is restricted.
  • Ideal for PAS 2035 projects as ventilation and thermal performance are considered.

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Description:

The ARC Retrofit Eaves Insulator (REI) is a cutting-edge solution designed to enhance the thermal efficiency of existing buildings by addressing heat loss at the eaves junction. Traditionally, insulating this space has been challenging due to limited access, often leading to inadequate insulation and blocked ventilation paths, which can result in condensation and mould growth. The REI overcomes these issues with its innovative, wedge-shaped design featuring a patented hinged ventilation tray that adapts to various roof pitches. Its quick and easy installation process, with variable widths to suit common rafter spacings, makes it an ideal choice for retrofit projects, particularly those adhering to PAS 2035 standards, which emphasize both ventilation and thermal performance.

Download Datasheet
Key Stats
Key Stats LabelKey Stats Value
Tray widths 300mm up to 600mm
Insulation Non-combustible glass mineral wool
Ventilation maintained 25,000mm2
Mass Data available on request

Key Benefits

Easy installation

Tackles damp & mould

Patented design

PAS 2035 compliant

Application:

The ARC Retrofit Eaves Insulator was developed to address heat loss at the eaves junction of the existing housing stock in the UK. The eaves junction, where a pitched roof meets the wall, is a difficult detail to insulate retrospectively due to space constraints and therefore is prone to excessive heat loss.

Historically, mineral or glass wool was stuffed into this detail; however, this blocks the ventilation path from the eaves into the cold loft space and can result in mould formation and condensation in the structure.

If the installer estimates a ventilation gap, it is very difficult to ensure an appropriate ventilation path is maintained whilst fully insulating the eaves. A gap in the insulation at the eaves detail will result in a thermal bridge and a cold spot on the internal walls where moisture in the air can condense and mould will begin to grow.

Why is it critical to insulate the eaves properly?

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Get in touch today to discuss your requirements and learn more about our Retrofit Eaves Insulator. Our dedicated team is ready to collaborate with you from the initial consultation through to project completion, ensuring every detail is handled with expertise and care.
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Installation instructions

The ARC Retrofit Eaves Insulator is designed to be quickly and easily installed from the loft space, reducing labour time.

» Remove a sufficient amount of loft roll from the gap between the ceiling joists to access the eaves.

» Fold the ARC Retrofit Eaves Insulator in half with the plastic ventilation tray on the outside.

» With the ventilation ridges facing upwards, the tray should be compressed to expel the air from the bag.

» Push into the eaves space with the hinge of the ventilation tray facing the corner of the eaves. The ventilation ridges should be facing upwards.

» If access is limited, the product should be pushed into the eaves using a pole or broom handle.

» The product will slowly unfold as air re-enters the bag. Once unfolded, the ventilation tray ridges should be in contact with the roof felt or the underside of the sarking.

» Lay loft roll up to the ARC Retrofit Eaves Insulator ensuring that there are no gaps. Ensure that the ventilation path is maintained over the loft roll insulation.

» At the end of a run, where the gap between the ceiling joists may be smaller, open the polythene bag, cut the insulation to size and reseal using duct tape. The product can then be fitted as normal.

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