Where should air bricks be located?

Asked By: Yannis Kartarius | Last Updated: 15th April, 2020
Category: home and garden indoor environmental quality
4.7/5 (536 Views . 43 Votes)
Air bricks may be located either above or below DPC level and where possible on all sides of the building. Ideally air bricks should be located at least 75 mm above hard and soft landscaped areas to reduce the risk of being obstructed or flooded (see diagram 1).

Click to see full answer


Similarly, you may ask, where should air bricks be positioned?

Airbricks can be positioned either above or below the damp proof course (DPC) level, and should ideally be incorporated on all sides of a building, typically at least 75 mm above the ground to prevent water ingress.

Additionally, do modern houses have air bricks? This is where the air bricks come in. There are different types of air brick. The traditional type is the clay air brick, heritage air bricks tended to be cast iron – which are sometimes very ornate – and the modern air bricks are plastic.

One may also ask, do houses need air bricks?

If your house has timber floors or a beam and block floor you should have airbricks to allow air to circulate underneath the ground floor, this is also known as ventilation. All properties with hollow floors should have air bricks built into the wall to allow a free flowing passage of air.

What is the spacing for air bricks?

Install additional vents Ideally, the openings should be provided on at least two opposite walls, and should be large enough to give an actual opening of at least 1500mm2 for each metre run of wall. Typically air vents (the size of a house brick) should be spaced every 1.5-2.0m around the perimeter of the building.

36 Related Question Answers Found

How many air bricks should house have?

As a general rule of thumb, you should place one air brick every one and a half metres to two metres along the wall. For large buildings, install the air bricks placed at one and a half metres and consider using larger air bricks.

Do air bricks let rain in?

On the outside, very close to the wet inside area, is an air brick. the air brick is not covered from rain.

Can you block up air bricks?

If the air bricks are blocked or closed this will reduce the ventilation and the risk of serious rot and damp will be increased. Air bricks should never be blocked or closed and it is recommended that all air bricks are inspected and cleaned on an annual basis.

Should air bricks be above damp course?

Air bricks may be located either above or below DPC level and where possible on all sides of the building. Ideally air bricks should be located at least 75 mm above hard and soft landscaped areas to reduce the risk of being obstructed or flooded (see diagram 1).

Do cavity walls need air bricks?


Because cavity walls are meant to be weathertight, air bricks should not be used in a cavity wall system. They allow for both air and moisture to enter into the wall cavity, something which is undesirable for this method of construction. If the insulation comes in contact with moisture it can become damaged.

How many air vents do I need?

Divide the number of vents by the amount of square footage in each room in your home. You will need at least one vent in every room that is 100 square feet or smaller and two to three vents in every room that is larger than 100 square feet.

Does a house need ventilation?

A house needs to be well ventilated for the comfort of its residents and to help care for the building. Moisture can condense, leading to problems with damp, while inadequate air flow results in a build-up of indoor air pollutants from household products.

Is it OK to cover air vents?

You could mess with the air flow.
Just because you cover the vent, it doesn't mean your HVAC system knows that. It will keep pushing air to those vents, and if they're closed, you could cause a buildup of air pressure and insufficient airflow which could damage your system.

Why do old houses have air bricks?

Airbricks, sometimes called air bricks or air vents, are special bricks containing holes that allow air to enter under the floor of buildings that have suspended floors. Cavity walls also need ventilation to allow airflow that will prevent moisture build up.

What happens if you cover air bricks?


It is fine to cover them up in, but if you leave them covered-up permanently you get damp in the wall, as happened in our house because the person who blocked it up didn't leave a vent/air hole. As for external air bricks.

Do I need an air brick?

Air bricks are necessary to achieve the required levels of ventilation as stipulated in Building Regulations Approved Document J 2010. Air bricks – also known as vent bricks or ventilation bricks - are traditionally made of clay, and most still are today. Air bricks can be installed quickly and easily.

How do you install air bricks?

You can use a paint brush and some clean water to do this or a garden sprayer. Apply plenty of mortar to the bottom and sides ready for the air brick to be inserted. Apply some mortar to the top of the air brick and then carefully insert it into the hole, ensuring that the air brick remains level.

Can mice fit through air bricks?

Check air bricks are in place and intact. Mice can squeeze through holes no bigger than the diameter of a pencil. If mice can fit through your air bricks then you can prevent this by fitting a wire mesh over them (don't block them!). Look for access points, typically around gas, electricity and water pipes.

How do you attach mesh to air bricks?


1) Glue Mouse Mesh with mastic adhesive
  1. use a cartridge type exterior glue available in most DIY shops.
  2. brush off or wash away any dirt, moss or loose brick and allow to dry.
  3. do not remove hole covers at corners of Mouse Mesh frame.

How do I stop cold air coming through my air vents?

Here's what to do if you notice cold air coming from your vents:
  1. Install insulation. Poor insulation causes rapid cooling of the air as it moves through your home.
  2. Check connections. Over time, the connections in your ductwork can come loose.
  3. Update your HVAC.

Do you need an air vent with a combi boiler?

Although the boiler cupboard does not require any form of air vents or additional ventilation, the boiler requires oxygen in order to burn the gas correctly. The flue is the pipe that allows the waste gases produced by your boiler to be released from your home.