Is Roof Ventilation Necessary?

Roof ventilation is a vital part of your roofing structure but, as some properties don’t have adequate ventilation, those homeowners may wonder whether the installation of a ventilation system is worth the cost. Here we will be exploring why roof ventilation is necessary.

Is roof ventilation necessary?

Yes – roof ventilation is necessary. Having adequate ventilation is extremely important in keeping your home and roofing structures healthy.

It may seem counterintuitive when you want to keep heat in the home to allow air to escape via a vent, but warm air becoming trapped in the property is not a good thing. Trapped warm air causes condensation when it has nowhere to go, which can lead to more serious problems.

Ventilation, however, allows air to circulate, which reduces the risk of condensation and also prevents the roof space from getting too hot or too cold. This means moisture levels inside the property are reduced.

Common problems caused by poor ventilation

Mould

As well as being unsightly, mould growth can cause health issues. Mould produces allergens, irritants, and even toxic substances, which are dangerous if touched or inhaled. Mould can also ruin items stored in the loft. For these reasons, you want to not only get rid of the mould as soon as possible but also prevent it from coming back.

Ice dams

Roofs that have poor ventilation are susceptible to ice dams. Ice dams can form when snow melts and refreezes continuously as a result of trapped warm air. This ice then creates a barrier that prevents water from running off the roof and allows water and ice to get under the roof tiles or underlay. This can result in leaks, as well as potential structural damage.

Sagging roof

Because excessive moisture weakens the materials that make up the roofing deck and has the potential to dissolve the adhesives, the roof will begin to sag and warp, which becomes dangerous for the inhabitants.

Deterioration of roof system materials

Poor ventilation traps moisture in the home, which can reduce the life expectancy of roof materials. This means you will need to repair or replace them sooner than you would normally. For example, loft insulation roll becomes ineffective if it gets too damp, which is common in homes with poor ventilation.

Rust

Damp affects materials differently and, in the case of metal, it allows rust to set in. This means crucial fittings such as screws, nails and straps can eventually fall apart, seriously jeopardising the safety of your roofing system.

Rot

Just as damp causes metal to rust, excessive damp will cause wood to rot. In the long term, excessive moisture and damp in the home can result in rotting timber. If rot affects structural wood such as your roof rafters, then your roof is no longer safe and will need to be repaired immediately.

What types of ventilation are there?

As you can hopefully now understand, roof ventilation is a necessity. If you don’t have adequate ventilation, you may be wondering what types of ventilation are available to prevent any of the above problems from affecting your home.

Some of the common types of ventilation are:

• Through-wall extraction vents
• Tile vents
• Lead ventilators
• Vent turbines
• Flat roof vents
• Circular soffit vents
• Continuous soffit vents
• Fascia vents

Roof ventilation is necessary for both the health of your home and the inhabitants. Even though installing a new ventilation system comes with a financial cost, there will be a solution to suit your budget and the long term benefits will outweigh the initial cost.If you need help installing a roof ventilation system in your home, please get in touch.