Showering or bathing without opening the window or using an extractor fan can cause moisture levels to increase, as can washing clothes on radiators etc. Do I need these on all 4 sides of my pitched roof or just on two sides to get the cross flow ventilation? Please note these are designed as a remedial solution to roof ventilation and do not meet the standards for permanent roof space ventilation on their own, and felt lap vents may adversely affect wind uplift of slates and tiles. We have hundreds of DIY project tutorials covering all aspects of building and DIY that provide step by step instructions on how to complete your given task.

I’ve never found it challenging to install these vents, in fact, getting into the loft is harder than fitting the vents! This amount includes seller specified domestic postage charges as well as applicable international postage, dispatch, and other fees. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable. There is a calculation that is use to work out the airflow required but it is based on a given airflow requirement.Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. So, for example, if your roof is 8m long, you would need 8m (=8,000mm) multiplied by 10mm =80,000mm2.

The vent will help to combat the problem of condensation build up caused by the extra insulation by adding additional ventilation into the roof space. Next time you have a hot bath, look at the cold mirror, window or tap; condensation forms here just as it does in the loft. They sometimes come un-attached from the roof vent allowing the wet bathroom air to be pumped directly into the loft space. Mechanical ventilation, such as an extractor fan, would be effective, but I’ve rarely seen them in lofts and they consume electricity. The vent ridge replaces a normal ridge tile and the felt below the vent ridge is cut to allow the air out through a sleeve which comes with the ridge tile.You should ensure that the opening of felt laps on the property will not adversely increase the wind uplift load on the tiles/slates or the driving rain resistance of the roof, for more information see BS 5534:2003, 5. For some, the idea of ventilating the roof space can ring alarm bells as they believe they’ll lose precious warm air which should be warming their home during winter. If it is simply move it back from the vents and make sure there’s adequate room for the air to circulate.