Please Note: 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. 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 Information Usually fitted retrospectively to properties with additional loft insulation recently installed, however the Felt Lap Vent will help to combat the problem of condensation build up in any roof space with a lapped felt/membrane construction. 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. 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.

With three felt clips that secure the vents in place, regardless of whether felt edges are jagged or deteriorated, these vents are often fitted retrospectively to buildings where extra loft insulation has recently been installed. Though, they can also reduce condensation build-up in any roof space that features a lapped felt/membrane structure. Features & Benefits: Manthorpe Felt Lap Vent (Box of 50) You're able to select a preferreddelivery date in your shopping basket. Whilst we aim to deliver your items on this date, it is not guaranteed. 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. This right starts from the point you or someone you nominate receives the goods. If your goods are being delivered in multiple deliveries your right starts from the point the last delivery is received. If the delivery is missed for any reason, you will be billed again for the re-delivery. See below: failed deliveries.

Feefo reviews

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.

A felt lap vent will not meet the requirements for roof space ventilation on its own. The felt lap vent only provides airflow through the vent flaps and will need to be paired with another kind of roofing ventilation to ensure your roof space is fully ventilated.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.

Made from an injected moulded polypropylene they are a lightweight solution that is fully recyclable. How Many Vents Do I Need?Selecting the amount of airflow, then dividing the roof length by the spacing (in meters) indicated below. Free Flowing Airflow 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 Felt lap vents are designed to increase the amount of ventilation in existing roof spaces. They tend to be fitted retrospectively to properties which have additional loft insulation, with the roof lap vent helping to combat the issue of condensation accumulation.