Roof Void Ventilation

Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

Roof void ventilation.

Inadequate venting causes moisture and heat to get trapped in your attic. The outside air that s taken in disperses through higher parts of the roof. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed. Airtrak assists specifiers builders and specialist contractors in helping them to meet the requirements of the building regulations in relation to the important issue of roof void ventilation and the control of condensation.

Most building codes require a ratio of 1 150 ventilation space to attic floor space. Condensation encourages rot and mould growth. Duo pitch roofs greater than 200 pitch or greater than 10m span should have additional ventilation at the ridge to assist airflow through the roof void equivalent to at least a 3 mm wide continuous gap. What is less straightforward is the ventilation of the roof void above.

Beyond the decreased capacity for insulation when venting the roof deck venting the roof deck or the attic has some other drawbacks worth considering. Water vapour can pass through most building materials and will permeate the roof space through plasterboard ceilings service holes downlight fittings and loft hatches etc. Airtrak roof void ventilation system airtrak is a proprietary range of ventilators designed specifically for the ventilation of roof voids. To be sure your roof is getting enough ventilation there are simple calculations that you can follow.

Roof voids must be ventilated in order to stop warm air condensing on cold surfaces. A roofing ventilation system works by pulling in air from intake vents that are placed on the lower part of the roof.