Pitched Skillion Roof >5°
For a Pitched Skillion Roof >5° , according to BS5250 (British Standards Management of moisture in buildings), a calculated airflow of 25,000mm² per linear metre at the eaves and a minimum of 5mm2 per linear meter at the high point (barge) is required to manage moisture in the roof cavity. This is achieved by creating a calculated, unimpeded airflow system that will allow outside air into the roof cavity, above the insulation throughout the roof cavity, complying with H1 and NZS4246:2016 and existing through the ridge cap of the roof at the high point (ridge), by means of negative pressure created by the applied ridge vent and the natural convection of the warm internal air. This manages moisture created/generated by means of construction moisture and occupancy behaviour. To ensure there are no blockage points through the roof cavity a 20mm vented batten is applied on top of purlins. To manage and reduce the risk of dew point transference from roofing iron to underside of underlay caused by variance of temperature, creating separation and ventilation between the iron and underlay is recommended.
Over Fascia Vent
The VENT Over Fascia Vent – G2500N is the most practical and cost efficient method of ventilating the Eaves for skillion roofs, and truss roof pitches between 5-15 degrees. It is easy to install, discrete and is compatible with either timber of metal fascias.
- 25000mm2 p/lm free flow of air
- Releases hot air from roof voids and manages condensation
- Easy to install
- Not visible as hidden by spouting/gutter
- The only solution to ventilate builds with no eaves
- Forms part of a passive ventilation system that works year round with no moving parts or energy consumption
Ventilation & Drainage Batten
The VENT Roof cavity batten – VB20 is a 20mm Polypropylene Ventilation and Drainage Batten deigned to facilitate 16000mm² p/lm of passive airflow and cavity between the roofing underlay and roof Purlins.
The VENT VB20 reduces the risk of moisture build up and condensation in tight roof cavities.
Eaves Comb Filler
The G1275 VENT Eaves Comb Filler is designed with flexible fingers that adjust to fill the gaps left when using profiled tiles or steel roof cladding, preventing entry of birds and large insects.
The use of the G1275 eliminates the need to make or buy expensive purpose made profiled fillers that can block necessary airflow into the roof spacing between underlay and roof cladding.
Ventilation & Drainage Batten
The VENT VB10 is a 10mm Polypropylene Ventilation and Drainage Batten deigned to facilitate 8000mm² p/lm of passive airflow and cavity drainage between the roofing underlay or membrane and the roof cladding.
The VENT VB10 prevents the transfer of dew point from the underside of the roof cladding to the underside of the roofing underlay or membrane
The VENT Ridge Vent is designed to release warm air from the roof void using the natural convection of rising warm air or by means of negative pressure created by wind blowing over the roof.
The RV10 has an adhesive and flexible aluminium flashing which is designed to form to roofing profiles and prevent water ingress on any pitch roof.
Recommended Application :
– RV10P for cladding profiles with a through depth < 34mm
– RV10DT for cladding profiles with a through depth 34mm – 38mm
- Allows warm moist air to escape the roof cavity
- Forms part of a passive ventilation system
- Works year round with no moving parts or energy consumption.