--- product_id: 48907839 title: "Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow" brand: "manthorpe" price: "AR$58389" currency: ARS in_stock: false reviews_count: 8 url: https://www.desertcart.com.ar/products/48907839-pack-25-roofing-felt-lap-vent-stops-loft-roof-condensation store_origin: AR region: Argentina --- # Fits 400-600mm joist spacing 3000mm² airflow per vent Easy slot-in installation Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow **Brand:** manthorpe **Price:** AR$58389 **Availability:** ❌ Out of Stock ## Summary > 💨 Keep your loft fresh and dry—ventilate like a pro! ## Quick Answers - **What is this?** Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow by manthorpe - **How much does it cost?** AR$58389 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/48907839-pack-25-roofing-felt-lap-vent-stops-loft-roof-condensation) ## 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 - • **Universal Fit:** Compatible with joist openings from 400mm to 600mm - • **Regulation Ready:** Meets building standards for peace of mind - • **Secure & Durable:** 3 felt clips hold firm even on degraded felt - • **Optimal Ventilation:** Delivers 3000mm² airflow to banish roof condensation - • **Effortless Installation:** Slots seamlessly between felt laps for a no-fuss fit ## Overview The Manthorpe Pack of 25 Felt Lap Vent Stops is a must-have for any loft refurbishment, designed to prevent roof condensation by enhancing airflow with 3000mm² ventilation per unit. Easy to install from inside the loft, it fits joist spacings between 400mm and 600mm and stays securely in place with three felt clips, even on worn felt. Compliant with building regulations, this pack is the smart solution to protect your roof space and maintain a healthy home environment. ## Description Felt Lap roof Vents Pack of 25 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. 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. Review: Cleared Condensation Quickly and Effectively with Easy Install - I bought these as we had a problem with condensation in the loft of our new house. The en-suite bathroom had been vented directly into the loft (not easy to see as at other end of loft from hatch) and was first noticed when I went up to the loft to get the Christmas decorations down. This coupled with non breathable old style plastic roofing liner meant that I then found puddles of water everywhere and water running down the liner and trusses. After fixing the main cause of the condensation (venting the bathroom outside!!) we then needed to increase the airflow to dry out the loft and stop condensation occurring again. Initially I removed the insulation that was stuffed into and blocking the soffits, however I then had a choice to either try these or put vents into the soffits. These were the much easier (but more expensive) install so I thought they would be worth a try. I placed one in every other truss gap in the loft alternating between as low as I could reach and 3/4 of the way up the roof. I was not expecting great results as the loft was very wet, however two weeks later and it was nearly bone dry. Very impressed with the results and saved me from climbing ladders and drilling holes. Obviously it may not be suitable for all situations, but if you have non breathable liners like myself and getting to the soffits to install vents is awkward it may well be worth a try. Also if you have another root cause of condensation like me, then fix that first! Pros: Seems to provide good airflow Easy to install Does the job required Cons: Expensive for what they are. Review: Manthorpe G630 Felt Lap vents really works at getting rid of condensation - Item made out of thin plastic but still fit for purpose. Very easy to fit in the felt overlaps, just slides into place & is held in place with it's plastic clips. You can feel air movement straight away if the wind is in the right direction. Fitted early Jan 2017, so far seems to work very well at completely clearing the condensation. I bought 25x (to fit a 5 bedroom house with a L shape loft) but really only needed to fit 20x to get the loft totally clear of condensation. If need be I'll fit the rest later. I suppose it depends how bad the condensation is to how many you need & how you space them. You can check out these on the manufacturers web site which gives product info & fitting PDF files plus a Manthorpe G630 vent installation video.Very useful info. A recommended purchase if you suffer from condensation &. have a felt roof lining in which you can slide these vents. ## Features - Felt Lap Vent Prevents Roof Condensation - Pack of 25 - 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 | B00M996JCI | | Best Sellers Rank | 465,565 in DIY & Tools ( See Top 100 in DIY & Tools ) 368 in Vents | | Brand | Manthorpe | | Customer Reviews | 4.6 out of 5 stars 350 Reviews | | Horsepower | 3.5 | | Item Type Name | Felt Lap Vent | | Manufacturer | Manthorpe | | Model Number | G630 | | Part Number | hsmart-686 | | Power source | Gas Powered | | UPC | 790295513575 | | Unit Count | 1.0 count | | Unit count | 1.0 count | ## Product Details - **Brand:** Manthorpe - **Horsepower:** 3.5 - **Manufacturer:** Manthorpe - **Power source:** Gas Powered - **UPC:** 790295513575 - **Unit count:** 1.0 count ## Images ![Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow - Image 1](https://m.media-amazon.com/images/I/61mMwEm7jQL.jpg) ![Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow - Image 2](https://m.media-amazon.com/images/I/61HV1dqUS3L.jpg) ![Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow - Image 3](https://m.media-amazon.com/images/I/61IupL1KsML.jpg) ![Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow - Image 4](https://m.media-amazon.com/images/I/71a7uHPkIHL.jpg) ![Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow - Image 5](https://m.media-amazon.com/images/I/61NHNM29aLL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Cleared Condensation Quickly and Effectively with Easy Install *by B***4 on 22 February 2017* I bought these as we had a problem with condensation in the loft of our new house. The en-suite bathroom had been vented directly into the loft (not easy to see as at other end of loft from hatch) and was first noticed when I went up to the loft to get the Christmas decorations down. This coupled with non breathable old style plastic roofing liner meant that I then found puddles of water everywhere and water running down the liner and trusses. After fixing the main cause of the condensation (venting the bathroom outside!!) we then needed to increase the airflow to dry out the loft and stop condensation occurring again. Initially I removed the insulation that was stuffed into and blocking the soffits, however I then had a choice to either try these or put vents into the soffits. These were the much easier (but more expensive) install so I thought they would be worth a try. I placed one in every other truss gap in the loft alternating between as low as I could reach and 3/4 of the way up the roof. I was not expecting great results as the loft was very wet, however two weeks later and it was nearly bone dry. Very impressed with the results and saved me from climbing ladders and drilling holes. Obviously it may not be suitable for all situations, but if you have non breathable liners like myself and getting to the soffits to install vents is awkward it may well be worth a try. Also if you have another root cause of condensation like me, then fix that first! Pros: Seems to provide good airflow Easy to install Does the job required Cons: Expensive for what they are. ### ⭐⭐⭐⭐⭐ Manthorpe G630 Felt Lap vents really works at getting rid of condensation *by C***. on 10 February 2017* Item made out of thin plastic but still fit for purpose. Very easy to fit in the felt overlaps, just slides into place & is held in place with it's plastic clips. You can feel air movement straight away if the wind is in the right direction. Fitted early Jan 2017, so far seems to work very well at completely clearing the condensation. I bought 25x (to fit a 5 bedroom house with a L shape loft) but really only needed to fit 20x to get the loft totally clear of condensation. If need be I'll fit the rest later. I suppose it depends how bad the condensation is to how many you need & how you space them. You can check out these on the manufacturers web site which gives product info & fitting PDF files plus a Manthorpe G630 vent installation video.Very useful info. A recommended purchase if you suffer from condensation &. have a felt roof lining in which you can slide these vents. ### ⭐⭐⭐⭐⭐ They really do work *by L***4 on 29 January 2023* I had no problem with damp in my roof space until I fitted a floor in the loft and also we had a shower pump installed which created a lot of steam in the bathroom. Both these factors then contributed to condensation forming in the loft, I went in to the loft to get the Christmas decorations only to find everything wet, the floor had water on it, the felt was dripping, it was really bad and the wooden rafters were also very wet - not good. I read the reviews on this product and thought for the sake of £62 it was worth a try before calling in a roofing expert. It took me around 15 minutes to install 25 vents - very easy indeed. I inspected my loft one week after installation and now it is completely dry, no damp or condensation whatsoever. Even all the water that had accumulated on the floor has dried up in just 7 days. I have seen comments saying that the vents are expensive for what they are - just some moulded plastic which is true but then who cares? - It's what they do that counts - and they solved my roof problem 100% without having to call in experts and saved me a fortune, I'm sure. I just ordered a second pack as the box of 25 fitted about half of my roof space, so I will finish the job off now with another box - I cant recommend these enough. ## Frequently Bought Together - Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow - 12 x Felt Lap Vents, Loft Vents for Condensation, Roof Ventilation Lap Vents, Felt Lap Vents Prevents Loft Roof Condensation, Keep Attic Space Ventilation Airflow - 10 Pack of Thermahood TH 001 - Covers for Downlighter Ceiling Lights and Spotlights - Aids Energy Efficiency --- ## 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.com.ar/products/48907839-pack-25-roofing-felt-lap-vent-stops-loft-roof-condensation](https://www.desertcart.com.ar/products/48907839-pack-25-roofing-felt-lap-vent-stops-loft-roof-condensation) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-09-18*