In short yes, rain has the  potential to get through air bricks, especially during heavy downpours or strong winds. The purpose of air bricks is to allow airflow for ventilation, but their open design also makes them susceptible to the ingress of water. How much rain gets through air bricks is dependent on a number of factors such as the size and placement of the bricks, the intensity and direction of the rainfall, and the presence of any protective covers or screens. 

If you want to prevent water damage, our advice would be to consider installing air brick covers. Air brick covers will significantly minimise the amount of rain or wind entering your property while still allowing you the ventilation needed to keep your home free from damp.

When covering air bricks with mesh the first thing you need to do is measure the dimensions  and obtain mesh screens or grilles that fit snugly over them. Then make sure you clean the surface around the air bricks before applying a weatherproof sealant or adhesive around the edges of the mesh screen. You can then carefully press the mesh into place, ensuring it’s level and securely adhered. As an additional measure you can use screws or clips to further secure the mesh if you feel it is necessary. Make sure you pick a mesh material that allows for proper ventilation while preventing pests, debris, and rain from entering through the air bricks. The most commonly used types of mesh are generally those made of galvanised steel or plastic.

Covering air vents is generally not recommended as it can disrupt proper ventilation and airflow within a building or space. Air vents are designed to allow the circulation of fresh air and removal of stale or contaminated air, which is crucial for maintaining healthy indoor air quality. 

If you cover an air vents it can lead to moisture build up, mould growth, and poor air circulation. This can potentially cause other problems for both the property and anyone living or working there. However, occasionally it may be necessary to cover air vents on a temporary basis such as during extreme weather conditions or for privacy reasons. In such cases, it’s advisable to seek professional guidance to ensure your property continuous to receive proper ventilation. 

Mice can potentially get through plastic air bricks, especially if there are gaps or cracks in the bricks or surrounding areas. Because they are small and agile mice can squeeze through surprisingly small openings. To stop mice getting through air bricks, the best thing to do is  install fine mesh covers or grilles that have openings smaller than 1/4 inch. Regular inspection and maintenance of air bricks and ventilation systems can also help deter mice and other pests