---
product_id: 48907839
title: "Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow"
brand: "manthorpe"
price: "32314 som"
currency: KGS
in_stock: true
reviews_count: 8
category: "Manthorpe"
url: https://www.desertcart.kg/products/48907839-pack-25-roofing-felt-lap-vent-stops-loft-roof-condensation
store_origin: KG
region: Kyrgyzstan
---

# 3000mm² airflow per vent Fits 400-600mm joist gaps Easy slot-in install Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow

**Brand:** manthorpe
**Price:** 32314 som
**Availability:** ✅ In Stock

## Summary

> 💨 Breathe New Life Into Your Loft – Condensation’s Worst Enemy!

## 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?** 32314 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/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:** Designed to fit standard 400-600mm joist spacing for versatile use.
- • **Durable Secure Clips:** Triple felt clips hold vents firmly—even on degraded or loose felt.
- • **Regulation Compliant:** Meets building standards for safe, effective loft ventilation.
- • **Maximized Ventilation:** Each vent delivers 3000mm² of airflow to banish condensation fast.
- • **Effortless Installation:** Slots seamlessly between felt laps—no ladders or drilling needed.

## Overview

The Manthorpe Pack of 25 Felt Lap Vent Stops is a retrofit ventilation solution engineered to prevent roof condensation by enhancing airflow in loft spaces. Easy to install from inside the loft, these vents slot between felt laps and secure with triple clips, fitting joist gaps from 400mm to 600mm. Each unit provides 3000mm² of airflow, effectively reducing moisture buildup and meeting building regulations—ideal for millennial homeowners upgrading insulation and seeking hassle-free, long-term roof health.

## 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 | 261,980 in DIY & Tools ( See Top 100 in DIY & Tools ) 204 in Vents |
| Brand | Manthorpe |
| Customer Reviews | 4.6 out of 5 stars 348 Reviews |
| Horsepower | 3.5 |
| Item Type Name | Felt Lap Vent |
| Item height | 16 centimetres |
| Manufacturer | Manthorpe |
| Model Number | G630 |
| Power source | Gas Powered |
| UPC | 790295513575 |

## Product Details

- **Brand:** Manthorpe
- **Horsepower:** 3.5
- **Manufacturer:** Manthorpe
- **Power source:** Gas Powered
- **UPC:** 790295513575

## 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)

## 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.

### ⭐⭐⭐⭐⭐ Most definitely works!
*by K***W on 14 January 2019*

Stumbled across these as I was looking for an easy way to dry out my loft when the immersion heater boiled the expansion tank ( Long story). But the loft roof was covered in water droplets dripping down getting everything wet. Read some reviews on Amazon and thought they were worth a try before having to concede to an expensive option. I have a 4 Bed detached house it has a large roof so bought the box of 25. They arrived a day early. For what they are the price is probably a bit expensive but having shopped around these where the cheapest. And definitely cheaper than getting someone in to dry it or safer than putting a dehumidifier up there. They took about an hour to fit having to climb around stored stuff and joists. I found a video on YouTube that was helpful and placed them at various heights across the roof. 1 week later I have checked to see if there is any progress. The weather hasn't been too cold but it's still winter and there hasn't been much of a wind either so I wasn't expecting a great deal of change. But I'm pleasantly surprised. There is definitely progress, a lot of dry areas appearing the vents are definitely making a difference. I've moved a few as they had completely dried the area around them. I'll update this review in another week. Ok so it's been a almost another 2 weeks but I'm really pleased with the outcome. Even though the weather turned colder and wetter the loft is now almost completely dry a very fertile water droplets remain on the felt and I'm confident these will disappear in the coming days. Upgraded to 5 stars. 👍👍👍

## Frequently Bought Together

- Pack 25 Roofing Felt Lap Vent Stops Loft roof Condensation / Attic Space Ventilation Airflow
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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-13*