Ventilation Of The Sub Floor Layer
In a cavity wall the airbrick should be inserted into the exterior leaf of the wall as for a solid wall but you will need extra long drill bits http://www.simplifydiy.com/walls-and-ceilings/sub-floor-ventilation
Successfully Damp Proofing Your Home
The building regulations therefore have a number of stipulations that must be fulfilled whenever a new building is being erected or repairs or modifications are being made to an existing property http://www.simplifydiy.com/walls-and-ceilings/damp-proofing