ARC Eaves Insulator

The Eaves Insulator is a pioneering, award winning product which directly tackles heat loss at the eaves junction whilst the ventilation tray maintains airflow pathway, helping to ensure damp and mould issues do not occur. The unique shape of the product allows for continuous insulation and increasing thermal efficiency of a home.

Key Facts:

Ensures junction detail between wall plate and ceiling is fully insulated
Resolves traditional cold spot at difficult to reach triangular cavity
Provides ventilation opening of 10,000mm2/m
Available to fit 600mm rafter centres
Can be used in conjunction with all ventilated facia and soffit designs
Helps improve your SAP rating – reduces heat loss through the wall plate junction by up to 49% when compared to traditional loft insulation
Housebuilder Product of the Year 2019

Application:

The requirement for ARC Eaves Insulator elevated from the problem of heat loss through the roof membrane at the junction between the pitched roof and the top of the cavity wall. The nature of the shape of this part of the dwelling lends itself to difficulties in access for construction workers to provide adequate and consistent insulation to prevent heat loss. Traditional methods of filling this ‘triangular cavity’ are to apply a mineralfibre product manually over the ceiling trusses, forcing it into the narrow gap at this junction. This method of filling this ‘triangular cavity’ can be problematic for the construction worker. Calculating the amount of mineral fibre required is difficult and knowing how much compression is required to achieve an effective fill results in inconsistencies in insulation and therefore the heat loss achieved. The person installing the Eaves Insulator should first familiarise themselves with the datasheet, ensuring the correct product is being fitted into the cavity.

Installation instructions

The ARC Eaves Insulator is designed to be easily installed using the same method as a standard eaves tray. The stalk of the insulation is placed into the top of the external wall cavity, with care being necessary to ensure a snug fit. The circular overlap of the insulation is pushed in between the roof trusses to rest at ceiling level. The eaves tray can then be mechanically fixed to the roof trusses.

Ensure that the ventilation tray is fixed to the rafters such that it allows for the required roof membrane droop. It is also important that the insulation does not push the tray out. Subsequent Eaves Insulators are fitted in the same manner, ensuring the insulation fits snugly against each other.

At the end of a run, where the truss centre maybe smaller, the ventilation tray can be cut to suit and the insulation compressed into the space available. If the width is too narrow, you can open up the polythene, cut the insulation to size and reseal the polythene, which can then be fitted in the same manner as the subsequent Eaves.

If an extension tray is required, first fit the main product as described above. Then, staple the extension tray further up the rafter adjacent to the fixed Eaves Insulator ensuring there is a slight gap between the two trays of no more than 20mm.

Additional information

Weight	20 kg
Material	Non-combustible glass mineral wool
Thermal Conductivity	0.035 W/mk
Ventilation Opening	10,000mm2/m
Rafter Centres	600mm

Is the Eaves Insulator fire rated?

No. The ARC Eaves Insulator provides thermal insulation at the wall plate junction, and is made using a non-combustible glass mineral wool insulation.

Aggregates & Cement

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Chemicals, Sealants & Adhesives

Civils & Groundworks

Damp Proof & Ventilation

Fixings & Metalwork

Timber

ARC Eaves Insulator

ARC Eaves Insulator