Roof voids must be ventilated in order to stop warm air condensing on cold surfaces. Condensation encourages rot and mould growth.
Compliance with ventilation standards is required on all buildings, except those that were constructed without ventilation provision or predate the Buildings Regulations. However we recommends that adequate ventilation is provided on all refurbishment projects regardless of age.
Ventilation Options
Through Fascia Ventilation
The PoloTM ventilated soffit range provides the equivalent of a 10mm or 25mm air path as required. Ventilation strips allow additional or alternative means of ventilation to the roof void.
Over Fascia Ventilation
Over Fascia Ventilator
JumboventTM
Where a ‘clean’ soffit is required, ventilation may be provided over the fascia using an Over Fascia Ventilator or JumboventTM, fixed securely to the top of the fascia board. The support provided by JumboventTM eradicates ‘ponding’ which may occur behind the fascia board where there is a tendency for the sarking felt to sag. Over fascia ventilation provides a continuous 10mm air path.
Roof ventilation and Building Regulations
These diagrams show the minimum air path dimensions required under the current Building Regulations.
Duo pitch roof greater than 15° pitch but less than 70° with insulaiton at ceiling level.
Duo pitch roof greater than 15° pitch with ceiling following the plane of the roof.
Mono pitch roof greater than 15° pitch but less than 70° with insulation at ceiling level.
Flat roof (less than 15° pitch) with insulation at ceiling level.
