Ask an expert

Get free help from our community of tradespeople

Air vents and bricks

Posted by Corinne Makepeace, on
I think I just need to generally improve ventilation in my house, mostly under the stairs. Windows are susceptible to condensation and subsequently, mould. It has been suggested that air bricks and/or vents could solve the problem. A survey on the house also suggested that the chimney (filled in) could be a problem - again I suspect poor ventilation. We're a semi and next door has the same problem, Silly question but: am I looking for a builder? Damp specialist?
Peter Barber

Peter Barber

Condensation is caused simply by too much humidity being created, and not enough ventilation to take it away. Other factors such as sufficient heating is quite important. Condensation is the most common form of dampness found in properties and the method of successful control is to reduce the relative humidity to an acceptable level. Mould can only grow in properties that suffer with a relative humidity level persistently above 71%. You have two options to control this. 1. Install humidity controlled fans to water making areas. Kitchen and bathroom. These fans are preset at around 60% RH which means that they will activate automatically when this level of humidity is reached. 2. fit a positive pressure fan to the loft area. These appliances has shown remarkable results in the control of condensation. The information on the fans can be found on the Nuaire website. Just search for Dri-master for the positive pressure fans, or Genie for the wall mounted extractors. You will need an electrician to fit either appliances so you will need to post your job into that category. I hope that this helps. Best Wishes. Peter Barber CSSW.,.CRDS. London Waterproofing Solutions.
Peter Barber

Peter Barber

Dear Corinne. Condensation is caused simply by too much humidity being created, and not enough ventilation to take it away. Other factors such as sufficient heating is quite important. Condensation is the most common form of dampness found in properties and the method of successful control is to reduce the relative humidity to an acceptable level. Mould can only grow in properties that suffer with a relative humidity level persistently above 71%. You have two options to control this. 1. Install humidity controlled fans to water making areas. Kitchen and bathroom. These fans are preset at around 60% RH which means that they will activate automatically when this level of humidity is reached. 2. fit a positive pressure fan to the loft area. These appliances has shown remarkable results in the control of condensation. The information on the fans can be found on the Nuaire website. Just search for Dri-master for the positive pressure fans, or Genie for the wall mounted extractors. You will need an electrician to fit either appliances so you will need to post your job into that category. I hope that this helps. Best Wishes. Peter Barber CSSW.,.CRDS. London Waterproofing Solutions.
Adrian Callow

Adrian Callow

If your chimney has been sealed up it should have a vent installed on the breast where the opening was once. As for windows get some trickle vents installed, this will help, any good builder will do this job for you.

What would you like to do now?

Find more questions Create my Job

Expert opinions

Projects that add value to your home - Phil Spencer

Looking to extend your home but don't know where to start? Property expert and Rated People ambassador, Phil Spencer, shares some thoughts on why loft conversions are such a popular way to create more living space and add value to your home.