Issues frequently encountered in basements are often due to inadequate or absence of ventilation, according to professionals. Here's how to ensure proper ventilation.
Improving Basement Ventilation: Expert Advice on MVHR, PIV, and More
Basement ventilation is a crucial aspect to consider during a conversion, ensuring a healthy and comfortable living space. In the UK, basement ventilation typically falls into two categories: passive and mechanical.
For storage basements, passive vents such as air bricks or through-wall vents can be used for ventilation. These rely on natural airflow, but can bring in cold drafts. However, for habitable basements, ventilation becomes non-negotiable.
Mechanical extract ventilation with heat recovery (MVHR) systems have gained popularity due to their ability to improve indoor air quality, control humidity, and enhance overall comfort. These systems, which include variable speed fans for energy efficiency, work by extracting stale, moist-laden air and introducing fresh, filtered air back in through a heat exchanger, recovering heat in the process.
Michael Zohouri, the founder of Pyramid Eco and an expert in energy-efficient retrofitting projects, often recommends MVHR for higher-spec jobs. He states that while it is a bigger investment, it provides constant fresh air, removes stale air, and recovers heat.
If you are adding space to your home without extending, installing MVHR is highly recommended for a completely new habitable basement. However, it's important to note that MVHR systems can be more expensive and complex to install compared to other options.
Another type of mechanical ventilation is Positive Input Ventilation (PIV). PIV units create positive pressure that displaces damp air through either natural or ducted openings. PIV systems, which are easier and more affordable to install than MVHR, work well in older properties where some airflow is present. Farook Member, the director and home improvement expert at QS Supplies, highlights that PIV systems are perfect for preventing mould.
Natasha Brinsmead, an expert writing about basement ventilation, suggests that the choice of basement ventilation depends on the intended use of the space, budget, and current condition. For example, extractor fans can be used to draw stale, moist air out of a basement, but they don't bring in fresh air unless paired with trickle vents.
Building regulations require basements to meet minimum air exchange rates to maintain indoor air quality, with rates varying depending on usage and space size. It's essential to consult with a professional to ensure compliance with these regulations.
In conclusion, home ventilation is crucial during a basement conversion. Whether you opt for MVHR, PIV, extractor fans, or passive stack ventilation, it's essential to consider the intended use of the space, budget, and current condition to make an informed decision.
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