When you have a new roof installed, you will most likely notice that the membrane used under the tiles is breathable. This allows air to flow through your roof so the loft area doesn't become stagnant or damp. As well as letting air in it of course lets out too. However many older roofs don't have a breathable membrane. When secondary membranes were first used a few decades ago breathable material wasn't available so when the roof was constructed the loft room was usually airtight, which inevitably after time caused problems to the wood used in the loft construction and the home in general.
Breathable membranes are available in a wide range of types that are suitable for most roofs.
Some roofs also use tightly packed tiles that allow little air to enter the roof space. It's for this reason that many roofs now have roof vents in place of individual tiles in different parts of the roof. The roof vents allow the flow of air into the loft space while stopping inclement weather and birds from gaining access to your roof space.
There are a wide range of different roof vents available that can be fitted into most roofs, no matter the type of tiles you have on the roof. The installation is really simple and they can stop damp in your roof by allowing the natural flow of air
