Check for roof leaks, burst pipes or faulty hot water tanks, lids, thermostats or heating elements etc. Now however, we all want to reduce our heating costs and keep our homes as warm as possible for as long as possible. Crafted with 10mm-wide hollow polycarbonate sheets and cut to 150mmx150mm pieces, this vent comes in 40-unit boxes and is easily installed by professional or DIY. Do I need these on all 4 sides of my pitched roof or just on two sides to get the cross flow ventilation?

Improving the airflow into a loft is the quickest, easiest and cheapest way to remove excess condensation. But do you really understand it and how the best ventilation systems work to improve the air quality in your house.They have an inbuilt gap that allows air to flow in and out of the roof whilst being protected from the elements.

And because it’s colder outside in winter, the underside of the roof is often covered in condensation – that’s moisture created by the occupants of the home that has risen into the loft space and condensated on the cold surfaces.

Tile/Slate Vents - If you’ve had tile vents fitted get up into the loft and make sure the sarking felt/membrane (the waterproof felt under the roof tiles has been cut below the tile vents to allow air in. Whether by accident or misunderstanding insulation gets pushed in and stops this vital source of ventilation. I have previously published a more in-depth guide to condensation in a loft and that would be a good place to start if you are still having issues after installing lap vents. Other measures may need to be in place to ensure that an adequate amount of ventilation is provided for the roof space.