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Selecting the amount of airflow, then dividing the roof length by the spacing (in meters) indicted below.
Roof ventilation has always been critical in letting a house or building ’breathe’ and ensure that roof spaces don’t gather moisture and condensation with unpleasant and possibly costly consequences. However, in modern houses with more efficient central heating systems and highly effective insulation methods, temperature differences created between living and roof spaces can present significant roof and eaves ventilation challenges. Drawn to colder roof spaces by convection, condensed water vapour can lead to rotting timbers, rusted metal fixtures and felt damage from mould growth. Loft vents come in all shapes and sizes. Our top 5 Loft Ventilation Products to stop condensation in your attic are listed below: Felt Lap Vents Roof ventilation from Manthorpe can help save both pennies and the environment. In an increasingly energy-conscious world, clients are much more aware of how to save money as well as the planet, so specifications can become even more demanding, putting extra pressure on budgets. Fortunately, Manthorpe’s cost-effective solutions cater for all types of roof ventilation requirements, including new build and refurbishment. Without proper ventilation, temperature changes and moisture build up can cause problems with condensation, unwelcomed damage to your belongings and insulation , damp and a variety of other issues. Ventilation is easy to install and worth the investment to keep your loft or attic free from these problems. The Manthorpe Felt Lap Vent is a refurbishment product designed to increase the amount of ventilation into existing roof spaces. Usually fitted retrospectively to properties with additional loft insulation recently installed, the Felt Lap Vent will help to combat the problem of condensation build-up in any roof space with a lapped felt/membrane construction.Each felt lap vent creates an air gap delivering up to 3000mm2/m of ventilating airflow. When combined with existing roof space ventilation, fitting evenly spaced lap vents on both sides of the loft will fix most loft condensation problems. Selecting the amount of airflow, then dividing the roof length by the spacing (in meters) indicated below. Free Flowing Airflow Easy to fit and install with a tapered lead-in that aids in smoothly slotting between the felt laps, these felt lap vents from Manthorpe are refurbishment products that increase ventilation in your existing roof spaces. The product has been designed as a remedial solution to help overcome the build-up of condensation in the roof space, however like all products that open the felt lap to provide ventilation it does not meet the code of practice BS 5534:2014+A2:2018 6.2.1.1. The specifier or user should be aware that the opening of felt laps on the roof may adversely affect the driving rain resistance of the slates, tiles or shingles, as well as increase the wind uplift forces acting on them. The EasyVent is both innovative, inexpensive and inconspicuous. Just like Manthorpe vents, they are installed on the inside of the roof, in between the overlap and underlap of the felt lining or membrane.
Delivery charges will vary and will depend on the manufacturer, weight, size and delivery location. The cost is automatically calculated when you add items to the shopping basket. For roof spaces that require more than the 15000mm/m² the spacings half for each additional 5000mm/m² 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, 5.8.1 & 6.2.1.1. Roof FeltVent Key InformationThe gap between a house’s roof and a house’s ceiling is called the roof void. In most houses, this is the loft or the attic. In houses with flat roofs, there is no roof void and roof vents are not needed. The position of the roof void means that it needs ventilation to prevent condensation. Without this, the rot will begin to set in in the timbers of the roof and spread to the rest of the house. Commonly found in bathrooms after a long hot shower, or kitchens after boiling the kettle, condensation is a daily occurrence in most homes. In some instances, it doesn’t cause any issues at all. But if it is left to build up in your attic or loft, it could lead to both serious health problems and structural damage. Works hand in hand with existing vent products to enhance ventilation throughout the roof space and combat condensation issues Manthorpe Felt Lap Vents are refurbishment products designed to increase the amount of ventilation into existing roof spaces with a lapped felt/membrane There are many products available to help you stop loft condensation, and most of them are inexpensive. Remember that they require a lot more work to fit, and work is often undertaken on the outside of the building. Here is an overview of 3 other roof vents that may help you: Roof Vents
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