--- product_id: 47894205 title: "10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation" brand: "manthorpe" price: "293.43 DT" currency: TND in_stock: true reviews_count: 8 url: https://www.desertcart.tn/products/47894205-10-x-felt-lap-vents-prevents-loft-roof-condensation-attic store_origin: TN region: Tunisia --- # 3000mm² airflow per vent Fits 400-600mm joist openings Easy slot-in installation 10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation **Brand:** manthorpe **Price:** 293.43 DT **Availability:** ✅ In Stock ## Summary > 🏠 Keep your loft fresh and dry—vent smart, live smart! ## Quick Answers - **What is this?** 10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation by manthorpe - **How much does it cost?** 293.43 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/47894205-10-x-felt-lap-vents-prevents-loft-roof-condensation-attic) ## Best For - manthorpe enthusiasts ## Why This Product - Trusted manthorpe brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** 3 felt clips secure vents even on degraded or loose felt for lasting performance - • **Regulation Ready:** Meets building regulations so you stay compliant while enhancing your home - • **Effortless Upgrade:** Simple slot-in design installs quickly from inside your loft—no hassle, no mess - • **Breathe Easy, Live Better:** Prevents roof condensation and moisture drops for a healthier loft environment - • **Perfect Fit for Your Space:** Designed to fit standard 400-600mm joist openings, ensuring seamless integration ## Overview The Manthorpe Felt Lap Vent pack of 10 is a retrofit solution designed to prevent roof condensation by improving attic ventilation. Each vent provides 3000mm² airflow, fits standard joist openings (400-600mm), and installs easily from inside the loft with secure felt clips. Ideal for homes with added loft insulation, it meets building regulations and ensures a moisture-free, healthier roof space. ## Description Felt Lap Vent Prevents Roof Condensation Pack of 10 Prevents roof condensation and moisture drops. Easy to fit just slots between the felt laps. Can be installed from inside of loft. The 3 felt clips secure the product in place even if the felt is degraded of loose. Can be fitted between 400mm joists and 600mm joist openings. Provides 3000mm² air flow per unit. Felt lap dimensions 275mm x 190mm Meets building regulations. 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, 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. ## Features - Felt Lap Vent Prevents Roof Condensation - Pack of 10 - Easy to fit just slots between the felt laps. - Prevents roof condensation and moisture drops. - Can be installed from inside of loft ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00M97O5YY | | Batteries Included | No | | Batteries Required | No | | Best Sellers Rank | 54,046 in DIY & Tools (See Top 100 in DIY & Tools) 26 in Vents | | Customer Reviews | 4.6 4.6 out of 5 stars (2,267) 4.6 out of 5 stars | | Date First Available | 11 Mar. 2021 | | Guaranteed Software Updates Until | unknown | | Item Model Number | _SML | | Item Package Quantity | 1 | | Item Weight | 720 g | | Manufacturer | Manthorpe | | Part Number | hsmart-532- var_SML | | Product Dimensions | 28 x 23 x 9 cm; 720 g | ## Images ![10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation - Image 1](https://m.media-amazon.com/images/I/41o0sfRUhuL.jpg) ![10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation - Image 2](https://m.media-amazon.com/images/I/61dyD9NYdQL.jpg) ![10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation - Image 3](https://m.media-amazon.com/images/I/61UMd8NfqjL.jpg) ![10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation - Image 4](https://m.media-amazon.com/images/I/81MrqgA33DL.jpg) ## Questions & Answers **Q: My rafters are 300mm apart. Will this product fit?** A: These vents are brilliant. We have had no condensation since we installed them. Yes they will fit and you don't need one ever space. We installed one every 3 rafters and it's solved. Best money we have spent for next to nothing **Q: How many of these do you need in a 3 bed mid terrace, I have already installed 8 easyvents and it’s not enough, still have condensation on the felt.** A: I put 6 vents in. They appeared to be effective most of time. I'm thinking of having a ridge vents fitted by a roofer. My condensation problem started when extra layer of insulation was fitted in roof space. **Q: I see many reviews (good) for helping with condensation. However, has anyone used or noticed benefits during the summer in terms of helping cooling?** A: I installed these in my loft at the beginning of the year to add ventilation to reduce/eliminate condensation. Over the weekend 17th and 18th June (hottest weekend in UK for a few years) the loft did seem cooler than previous years when I installed the vents I made sure that the insulation was pulled away from the eves to give additional ventilation so it could be a combination of the two. **Q: Do these vents make much of a difference. I have the old bitumen roofing felt with some tile vents but still tend to get condensation.** A: Hi, Thanks for your question reference the lap vents. Yes, they work, what you need to do is install a couple low down the roof and a couple up high, front and back and side if you have it. This helps as is forms a thru draft. Hoping this info helps Regards Alliance Remedial Supplies ## Customer Reviews ### ⭐⭐⭐⭐⭐ Absolutely 5-star — simple DIY fix that works! *by on Reviewed in the United Kingdom 14 July 2025* Brilliant, cost-effective solution for loft condensation problems. I had a big issue with condensation dripping onto the stuff I was storing up there. Added these where I was most concerned — one at the lower level and one at the upper — and you can really feel the draft now. Made a huge difference!Installed them all within minutes — so easy to do yourself. Just make sure to add them in between each beam for the best results and proper airflow. Highly recommend trying these before spending on any expensive roofing work.✅ Quick and easy DIY install✅ Cost-effective loft ventilation✅ Prevents costly condensation damage ### ⭐⭐⭐⭐⭐ Just works perfectly *by on Reviewed in the United Kingdom 15 February 2024* In the winter we've had terrible problems in our loft with condensation, often ruining lots of items stored up there.We're looked at different options to resolve this like installing air bricks etc, all of which seemed costly.On the off chance I thought I'd check Amazon for any solutions and came across these.I read through the reviews and say many people saying they bought 2-3 packs. We have a fairly large loft, but I thought I'd start with one pack first to see if they make a difference, and then maybe invest in more.They are very simple to install, literally just slot the in the gaps of the roof membrane. As soon as you start putting them in you can feel the air starting to circulate, it's really surprising. As we only had one pack I just randomly spread them out, and placed some at different heights.The difference just a single pack of these has made has been amazing. We've had some really cold weather since, and I haven't seen any condensation since installing these. Previously, we would see lines of soaking wet floor boards, and items with pools of water sitting on them (we used to cover everything with old bin bags to protect them). These have been so effective, that I don't think we even need any additional packs.If you have any condensation issues in your loft, I highly recommend these, and they are incredible value for money. ### ⭐⭐⭐⭐ Solved condensation issue by 90% *by on Reviewed in the United Kingdom 21 January 2023* I ordered these as I discovered a serious condensation problem on the roof felt during the cold spell in December. Water was literally dripping on to the insulation and the small boarded area. In September we'd added another layer of insulation, which I believe may have contributed to the issue. Having never previously heard of lap vents, I thought I'd order some after reading positive reviews. Very easy to install, they worked really well and quickly. I wasn't sure if that was down to the increase in temperature when the cold spell ended so I thought I'd wait until the next freezing weather to see what happened. The weather is currently freezing and I'm pleased to say that there is very little condensation up there. Probably a 90% improvement on the original situation. ## Frequently Bought Together - 10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation - ANSIO Dehumidifier 500ml Pack of 10 Condensation Remover Moisture Absorber Dehumidifiers for Damp, Mould, Moisture in Home, Kitchen, Wardrobe, Bedroom - UniBond AERO 360° Moisture Absorber Neutral Refill Tab, ultra-absorbent and odour-neutralising, for AERO 360° Dehumidifier, Condensation Absorbers, (4 x 450g) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/47894205-10-x-felt-lap-vents-prevents-loft-roof-condensation-attic](https://www.desertcart.tn/products/47894205-10-x-felt-lap-vents-prevents-loft-roof-condensation-attic) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-21*