Roof Space Ventilation Nz

Whilst it is possible to retrofit passive ventilation solutions to existing buildings it is highly recommended to incorporate passive ventilation during the design phase of any new building project.

Roof space ventilation nz. Balanced pressure also known as heat exchanger ventilation systems extract warm damp air from living spaces and pass it through a heat exchanger to heat up dry air which the system brings in from outside. In skillion roofs the roof cladding and ceiling run parallel typically within 300 mm of each other. But blowing cold air in from the roof space in winter will require you to ramp up your heating. Tevs aluminium vent strips are made in two standard widths with 3mm slots either 50mm or 25mm long x 3 00m although other special sizes can be made to order.

The dew point temperature the temperature at which water vapour in the air condenses as water is on the exterior side of the insulation so condensation is unlikely to occur. The ceiling space is on the warm side of the insulation. Positive pressure ventilation systems these are very common in nz in existing homes but do not comply with current ventilation standards for new builds. Ventilation natural ventilation of industrial and commercial buildings or of the above ceiling roof space in air conditioned buildings is a cost effective means of exhausting hot air or achieving a sufficient degree of air change in the building.

Nz commonly uses 4 5mm fibre cement for soffit linings with rebated timber fascia boards. The need for roof space ventilation is eliminated or reduced. Soffit venting is common to all roof space venting systems. Ventilating a home with no roof cavity a flat roof or a skillion roof design is something that should be planned prior to building and should involve a ventilation specialist and the architect who both understand each others point of view and the needs of the client.

Skillion roofs need carefully designed and installed ventilation to reduce the risk of moisture related problems. Our systems are structured and specifically tailored for new zealand buildings and the extreme climatic conditions. Roof ventilation achieving calculated continuous and unimpeded airflow through the roof cavity is relatively straight forward. This can fully meet building code requirements.

The roof space is generally inaccessible with little natural ventilation and the small roof space can accelerate problems with moisture. Essentially the system works by taking air from the attic or roof space and pumping it into the main living areas though ducts or vents. Natural ventilation is governed by two forces temperature and air pressure differences.