WHAT ARE EAVES?
Eaves are the part of a roof that projects out horizontally beyond the side of the structure it covers. They can have practical functions, such as to provide shade and protection from rain, as well as aesthetic functions, creating a definite distinction between walls and roof.
WHAT IS EAVES VENTILATION?
The ventilation of the eaves are a vital part of many roofing systems. They help air flow beneath your roofing sheets or tiles to combat the build-up of moisture which can cause condensation problems. Eaves ventilation systems are an integral part of a roof and is often combined with ridge ventilation to ensure your roofspace is fully vented.
THE IMPORTANCE OF EAVES VENTILATION?
Eaves ventilation is a more traditional method of introducing roof ventilation, and is often used alongside other methods, such as breathable membranes, to ensure continuous ventilation of the roof void. The need for adequate roofing ventilation is covered under BS 5250 (Code of Practice for Control of Condensation in Buildings). Roof voids must be ventilated in order to stop warm air condensing on cold surfaces. Condensation encourages rot and mould growth.
WHY IS ADEQUATE INSTALLATION NECCESSARY?
If inadequately installated, eaves ventilation products could allow water ingress from wind driven rain and snow to reach inside the void of the eaves. In colder weather this could result in repeated freezing and then thawing. Eventually, over time this will deteriorate the roofing system and potentially lead to water damage through the roof and thus, into the property.
BS 5250: For Roofspace Ventilation (Management and Moisture in Buildings) This standard aims to address all sources of moisture within buildings and the associated impacts to the building fabric and occupants’ health by preventing them from becoming breeding grounds for health hazards such as mould spores and spreading infections. It gives guidance on preventing moisture risk in buildings, including pitched roofs.
