---
product_id: 47894205
title: "10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation"
brand: "manthorpe"
price: "$117"
currency: NZD
in_stock: true
reviews_count: 8
category: "Manthorpe"
url: https://www.desertcart.nz/products/47894205-10-x-felt-lap-vents-prevents-loft-roof-condensation-attic
store_origin: NZ
region: New Zealand
---

# Fits 400-600mm joist spacing 3000mm² airflow per vent Easy DIY install 10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation

**Brand:** manthorpe
**Price:** $117
**Availability:** ✅ In Stock

## Summary

> 💨 Breathe new life into your loft—ditch condensation before it drips!

## Quick Answers

- **What is this?** 10 x Felt Lap Vents Prevents Loft roof Condensation. Attic Space Ventilation by manthorpe
- **How much does it cost?** $117 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/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

- • **Universal Fit:** Designed to fit standard joist spacings between 400mm and 600mm, perfect for most lofts.
- • **Durable & Secure:** Three felt clips keep vents firmly in place—even if felt is degraded or loose.
- • **Regulation-Ready:** Meets building regulations, ensuring your loft ventilation is both safe and compliant.
- • **Maximized Ventilation:** Each vent delivers 3000mm² of airflow, effectively preventing condensation buildup and moisture damage.
- • **Effortless DIY Upgrade:** Slots seamlessly between felt laps for a no-fuss installation from inside your loft.

## Overview

The Manthorpe Felt Lap Vent pack of 10 is a smart, cost-effective solution designed to prevent roof condensation by enhancing attic ventilation. Easy to install from inside the loft, these vents fit standard joist spacings and provide 3000mm² airflow each, secured by felt clips for lasting performance. Ideal for retrofit projects, they meet building regulations and help protect your home from moisture damage while improving air circulation.

## 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 3000mmÂ² 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.

Review: Absolutely 5-star — simple DIY fix that works! - 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
Review: Dry loft - Easy to fit. Good quality. Good value for money. Got rid of the condensation in my loft.

## 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 Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 5,096 in DIY & Tools ( See Top 100 in DIY & Tools ) 3 in Vents |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,252) |
| Date First Available | 11 Mar. 2021 |
| Item Package Quantity | 1 |
| Item Weight | 720 g |
| Item model number | _SML |
| 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)

## 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 D***A on 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

### ⭐⭐⭐⭐⭐ Dry loft
*by S***T on 3 December 2025*

Easy to fit. Good quality. Good value for money. Got rid of the condensation in my loft.

### ⭐⭐⭐⭐ Easy install and effective
*by B***N on 27 December 2024*

After being up in the attic I noticed alot of moisture droplets. After some research I put this down to airflow...or lack of it to be precise. It was a quick 10 minute job to get these installed (Inc getting the ladders and going in/out of the attic). I would say these have cleared up 95% of the moisture up there and to a level that I would consider "normal". I would highly recommend these as once they are in you can just forget about them.

## 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)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-01-24*