ventilate a roof?
Roof ventilation is essential:
- it allows the structure to breathe, and prevents condensation and moisture, which can damage the framework
- it helps to maintain the performance of the insulation
- it reduces the risk of roof depression when there are strong winds
Dimos is the creator of integrated ventilation, a complete range of ventilation solutions suitable for all types of roofs including attic, hip and low ventilation, as well as ventilated ridge systems. All Vedia® ventilations are made from a single ultra-resistant block; they are discreet and fully integrated into the roof.
Dimos offers a comprehensive ventilation solution together with aluminium double-glazed window frame kits with integrated flashing.
What is the best way
to ventilate a roof?
Pressure or head loss is the energy dissipated due to friction in a moving fluid, i.e. it is the loss of pressure that occurs within pipes due to the effect of the fluid’s viscosity. In a ventilation system, air resistance grows directly proportional to air flow. Head loss is used as a criterion for measuring the performance of ventilation systems: when there is less head loss, the air can circulate better, which means better ventilation. Dimos solutions offer excellent performance in terms of head loss.
Air must circulate with the least amount of head loss possible over the entire roof surface: Air enters through the low vents and exits through the attic vents, located near the ridge.
Typical ventilation for a pavilion roof (i.e. a roof hipped equally on all sides):
- 2 soffit vents: air inlets at the base of the roof under eave
- Attic vents: air outlets at the top of the roof
- 1 plumbing or sewer vent: air inlet used in a sewage and wastewater evacuation system.
- 1 mechanically controlled vent: air circulation managed by a CMV system
- 1 range hood vent: outlet for air sucked up by the range hood. The area ventilated by the soffit vents must be equivalent to the cumulative area ventilated by the attic ventilation.