22 x Felt Lap Vents for Loft Condensation prevention
Product description
This loft ventilation kit helps reduce condensation by improving air flow in attic spaces. The set includes 22 felt lap vents that sit between roof felts, allowing more air to enter from under the shingles and circulate through the loft.
Key Points
The 4BAOHUI system comprises 22 lightweight felt lap vents designed to fit most roofs. The arched design provides greater pressure tolerance and features multiple holes to significantly boost ventilation. Each unit delivers around 3000 mm² of free air flow to the loft space, supporting drier conditions during winter and helping vapour escape after bathrooms or showers. This is a practical solution for improving attic air exchange and reducing moisture buildup. 🔧🌬️
Technical Specifications
- Name: 4BAOHUI 22 x Felt Lap Vents
- Size: 203 mm long by 280 mm wide by 19 mm high
- Material: felt with curved profile to endure attic pressures
- Airflow per unit: 3000 mm² of free air flow
- Installation centres: suitable for joist centres from 400 mm to 600 mm
- Pack contents: 22 vents
Benefits
With the vents in place, warm, moist air from the living space can rise and be drawn out of the loft more efficiently. The improved ventilation helps control condensation on cold surfaces and can contribute to a drier attic environment overall. The design allows easy insertion between the roof fabric joints, meaning installation is straightforward for most DIY projects. The vents are compact enough to blend with roofing details while providing a clear path for air movement.
Usage Recommendations
Install the vents between roof joists at centres of 400 mm to 600 mm to align with typical roof layouts. Push the vents between the felt layers so air can enter from below the tiles without obstructing other roof components. Expect gradual improvements in attic dryness as airflow increases, particularly after bathroom use or during colder months when condensation is more likely. If you are planning extensive retrofit work, consider the overall roof ventilation balance to ensure adequate intake and exhaust paths.