But roof vents aren’t as simple as just drilling some holes in your roof and calling it a day. To make sure that the roof is still waterproof, you need to use specially designed roof vents. But there’s no reason to fear, there are several different approaches to roof vents and you’re sure to find one that suits your roof. Tiled Vents The provided clips need to be hooked behind the battens and laid along the tiles. After this, a box is used to roll out the abutment vent along so it covers the 10mm gap and touches the wall, clinging to the tiles like a second skin. Then lead flashing is applied over it to waterproof it but not over quite the entire vent. This ensures that the gap to let air is not covered by the flashing. Finally, the excess vent is trimmed away and the clips bent up over the flashing to finish it all off. Felt Lap Vents 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. Our sales office will need to be made aware of any delivery restrictions, such as narrow lanes, overhanging trees etc. that may cause restrictions. 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.

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. Simple to install even for a DIY Enthusiast, the vent simply slides between the two layers of underlay felt beneath your existing roof tiles or slates. They can be installed from inside the property so no need to remove any of the existing tiles, timber battens or felt. Important loft lap vent installation notes 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. Works hand in hand with existing vent products to enhance ventilation throughout the roof space and combat condensation issuesYou 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 Information It’s easy to ignore condensation in the loft or attic. Most people only visit their attic once or twice a year. The weeks running up to and following Christmas is one example as many people visit their lofts to bring Christmas decorations down from storage. Products are also available for slate roofs in the form of slate vents. Compact, easy to install, and discreet, these vents are ideal for period properties and stone houses, where they promote airflow and keep roof spaces free from condensation. They slot in place just like regular roof slates and blend in seamlessly with the rest of the roof. 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. The Felt Lap Vent can be fitted to any loft with joists ranging from 400mm to 600mm, and they are fully recyclable after use. EasyVent for Lofts.

If fascia vents enter at the roof’s lowest point, then abutments can enter at one of their highest – they can be placed where a pitched roof meets a flat wall. Abutment vents are rolled-out material that allows some air to enter and exit, and are installed and then covered in lead flashing. At ERoofing, we sell the Manthorpe Flash Vent.

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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. Manthorpe felt lap vents provides an effective solution to increasing the amount of free air ventilation to your roof space and thus preventing condensation. Typically retro-fitted in older refurbished properties that may not have an effective roof ventilation system or tile vents installed, and which may have had additional loft insulation. The Felt Lap Vent helps to combat the problem of condensation build up due to warm air in any attic or loft with a lapped felt/membrane construction, by increasing ventilation. Please ensure that you work safely at all times and get advice or help from a professional trades person if you are unsure. Felt Lap Vent Installation 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. All damaged or missing items should be reported to the driver and signed for as damaged or missing, wherever possible. The 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.

The Manthorpe Felt Lap Vent is a refurbishment product designed to increase the amount of ventilation into existing roof spaces. The key with abutment vents is that there needs to be a gap between the nearest batten and the flat wall. – 10mm for the Manthorpe vent though this can vary. The roofing felt needs to be draped around the battens so that the 10mm gap is clear. After this, the top layer of tiles needs to be placed so the abutment vent can be installed.Felt lap vents are another great way to help ventilate your loft or attic. Rather than creating an opening in the roof itself, felt lap vents just create an opening in the roofing felt. Roofing felt is a membrane between the tiles and the actual loft. While the tiles on the top of a house allow some air through, felt lap vents allow that air to make it through the roofing felt. This is particularly important if your house has roofing felt made up of a non-breathable membrane. At ERoofing, we carry the versatile and effective Manthorpe Felt Lap Vent, one of our best-selling products. Selecting the amount of airflow, then dividing the roof length by the spacing (in meters) indicted below. In this final section of our complete guide on how to stop condensation in loft spaces, we will give you all the tips and professional advice you need to banish condensation from your home. What causes condensation in your attic? Manthorpe Felt Lap Vents are refurbishment products designed to increase the amount of ventilation into existing roof spaces with a lapped felt/membrane