At some point or another, most of us will have opened up all the windows within our home and enjoyed the sensation of the breeze passing through – freshening everything up, freeing the living space from any condensation or moisture, and preventing the build-up of damp, mould or mildew. Well, the point of roof ventilation is exactly the same. Ventilated roofing systems are designed to keep the roof area dry, fresh and at a moderate temperature. Here are just some of the reasons that good ventilation is important for your roof.
Preventing excess moisture
It can be argued that the most important role of roof ventilation is to prevent the build-up of moisture caused by a lack of air flow. Just as a poorly ventilated room can suffer with damp, mould and mildew (causing damage to the paintwork, plastering and carpet), a roof with inadequate ventilation can experience a number of serious issues. Warm, moist air rises throughout the house, and, as it gets stuck when it hits a roof with poor ventilation, the moisture sits as condensation on the cold rafters, inner roofing deck and metal nails.
Severe condensation is likely to affect the roofing deck first – causing the timber structure to swell and, as such, reduce its ability to hold up the roof. Eventually, it could start to form dry rot on the deck, as well as rust on the nails, which would weaken the roof further and result in poor indoor air quality. There’s even a chance that bad condensation could seep through the loft flooring and cause damp patches on your ceilings. A well-ventilated roof, on the other hand, prevents excess moisture and keeps your home free from mould and mildew.
We were recently called to a damaged roof in Molesey to carry out urgent repairs which could have been prevented if there had been better ventilation.
Controlling the temperature
Even though we don’t often experience scorching temperatures here in the UK, it is still possible for our roofs to overheat if they are not properly ventilated. The roof of a house is exposed to the sun, so heat can quickly build up if there is not a sufficient outlet for hot air within the loft. This can cause the roofing membrane to shrink and the roofing shingles to blister, meaning they have to be repaired or replaced sooner than they should have to be. Heat absorption in the roof can make the entire living space feel warmer – so, with a well-ventilated roof, homeowners do not have to rely on air conditioning systems or fans as heavily, enhancing the energy efficiency of their property and reducing their energy bills.
Here at South Thames Roofing, we provide expert advice and roofing services to make your roof as well-ventilated and energy-efficient as possible. Contact us today to find out more.