Manthorpe Felt Lap Vent G630 - Roof Vent
Manufacturer/Brand: Manthorpe Building Products Ltd
SKU:G630/1-SINGLE
1990 in stock
Couldn't load pickup availability
Increase roof ventilation and prevent loft condensation problems with the Manthorpe felt lap vent
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
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
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 Felt Vent Key Information
- 3,000mm² airflow for each G630
- Can be fitted at joist centres ranging from 400mm to 600mm
- Easy to fit, the tapered lead in helps to slot the product between the felt laps
- The 3 felt clips help secure the product in place even if the edge of the felt is degraded
Loft condensation FAQ's
Why is loft condensation a problem?
Moist air condensating on a cold surface, causes the formation of droplets. These will fall onto whatever is in the loft space and make them damp; stored items, electrics, insulation, etc. Left unchecked, items will become damp and moldy and will ultimately degrade.
What are the causes of loft condensation?
Condensation occurs when moist, humid air meets a cold surface. When the dew point temperature is low enough, and the air contains enough moisture, condensation droplets will form.
How can you stop condensation in a loft space?
The normal solution to condensation, is to reduce humidity of the air and increase the temperature of the surface. In a roof space, this is best achieved through ventilation. By increasing the air flow, we transfer the air outside, replacing it with less humid air, and this reducing condensation. Ideally, this would be achieved using a combination of sofit vents and tile vents. However, that can be costly, so the loft felt lap vent is an ideal solution in certain circumstances.
Does insulating the loft stop condensation?
Insulating between ceiling joists can help up to a point, but too much insulation can actually contribute towards the problem. Insulating between rafters would help prevent the surface reaching the dew point, but is of course, an expensive project, and still needs to be done in conjunction with adequate ventilation.
Can I use a dehumidifier?
A dehumidifier would help, but only as a temporary solution, as it is more cost effective to solve the issue with adequate roof ventilation.
Additional Information for Manthorpe Felt Lap Vent G630 - Roof Vent
Delivery Information
Delivery & Collection Information
Your Manthorpe Roof Tile Vents will be delivered directly to your chosen location via our trusted parcel courier partners. Standard delivery takes 2–5 working days, though this may be longer in remote areas.
We strongly recommend waiting until your full order has arrived before scheduling any work.
For those who prefer to collect, our vents are stocked at our depot. However, please contact us in advance to confirm availability of your required vent and colour before visiting.