Condensation in loft ? - Cheap and easy fix using Felt Lap Vents
HTML-код
- Опубликовано: 10 июн 2024
- @FixitwithFowler will show you how to cure condensation in your loft using Felt Lap Vents,
This is probably the fastest and cheapest way to DIY ventilate damp or hot roof spaces and at only £3 each they are a bargain!
Amazon Links to the tools and materials used:
Felt lap vents (10 pack) amzn.to/3wN1OCv
Felt lap vents (20 pack) amzn.to/40ml7Qx
Cheaper felt lap vents amzn.to/3SyiOXC
www.amazon.co.uk/shop/fixitwi...
The Amazon links above are affiliate links. It doesn't cost you anything to click on them but I do earn a small commission if you do. As an Amazon Associate I earn from qualifying purchases
Lap vents are suitable for any roof with bitumen based under felts or modern breather membranes. Even new roofs fitted with breathable membranes can suffer from a build up of condensation or trapped heat under the right conditions. Often the extra ventilation offered by 10 - 20 of these simple low profile lap ventilation units can solve most problems.
Disclosure:
As an Amazon affiliate, I may earn from qualifying purchases via the link in this video description
00:00 Introduction
00:30 Where does the moisture come from?
01:16 How to cure the condensation!
02:05 Vented Eves or Sofits
02:19 WATCH THIS !!!!!
02:35 Non breathable Bitumen Felt
02:48 Felt Lap Vents and how to install them
03:29 Summary 
Хобби
![Condensation in Loft: Solved in Less Than 2 Minutes [DIY Friendly]](http://i.ytimg.com/vi/hkZzV5nAV8A/mqdefault.jpg)
Ordered a pack last week. And condensation disappeared within 5 days. Not even a drop.
Roofer had charged me £350 to put 4 air vents from outside.
They only took me 5 mins to install. Very impressed 😊🙌🏾🙌🏾🙌🏾🙌🏾
That's brilliant, im glad the video has helped you, as that is what my channel is all about! Hopefully, you have subscribed for more great videos!
Great video, straight to the point with simple instructions. I can't believe its so easy to get rid of the condensation!
Thanks for your comment 👍
Thank you for sharing knowledge and tips. Good luck for your business.
Hi, no problem. Hopefully, the loft condensation video was helpful!
This is a great idea, much cheaper than on roof vents (& not unsightly at all). Thanks for the video 👍
Hi, im glad you liked the video. Don't forget to give it a 👍 to help it reach other people! Thanks for your comment!
Good reminder, I just liked the video 👍😊
Great content, thanks for the easy explanation.
No problem, I'm glad you like the video!
Bad loft condensation and was quoted £4000 to fit external vent tiles! Saw your video, bought the vents for £20, fitted in 20 minutes and condensation cured immediately! Thank you soooo much!!!
That's amazing to hear, and I'm glad the video has helped you and potentially saved you £4000! Please consider supporting the channel with a super thanks 😊
That sound a lot for a few vent tiles. Probably another cowboy, scammer who tried his luck.
Surprised he did not try and get you to build an 80k extension to 'diffuse' the air
Cheers I just noticed condensation in our loft. And will do what you suggested. Many thanks
Hi John, thanks for your comment! Any problems just give me a shout. If you like my channel don't forget to subscribe 😉
Thank you, that loft looks exactly like my, so need this
Glad I could help, heres a link to the vents amzn.to/3HpqVjZ
Good video. 2022 has seen the coldest first two weeks of December since 2010. People are going crazy after these vents. Price has increased significantly. I use strips of polystyrene cut to size with a 45 degree slot at one end so it can be attached to the felt.
+leaphtc thanks for your comment. In all honesty anything that opens the felt lap would work. Don't forget to subscribe for more great videos and hit the notification bell!
Love youtube videos like this, no faffing about. Nice one fella!
Thanks for your comment 👍
added 8 of these a out 5 years ago. Not a drop of condensation since.
Highly Recommended!
Thanks for your comment 👍 🙂
What if no felt? Just boards
@nofurtherwest3474 then unfortunately, this won't work 😕
@@FixitwithFowler Ohh I see, thank you
No problem
Thanks
No problem, let me know if that fixed your condensation in the loft!
Yes I’ve ordered them yesterday and yes it’s been going on for years originally thought it was roof had scaffolding up checked roof nothing wrong with it even took tiles of at side of gable end where my son’s bedroom is bone dry felt underneath tiles and no issues summer now it’s getting cold it’s starting again
Thanks for advise appreciate it
Also subscribed to help channel 👍
Hopefully, this will cure it. Thanks for subscribing i really appreciate it!
Already fitted these, they fo the job.
These felt lap vents are so easy to fit!
I had this exact issue! the Lap Vents seem to have done the trick!
Loft nice and dry especially after a couple of windy days!
+TOMSTC thanks for your comment and im glad it worked for you. Obviously there can be other underlying issues that prevent these from working. Don't forget to subscribe to my channel for more great videos 😉
@Fix it with Fowler I also found a pipe left over from the old boiler system I think it was the overflow.
It was full off water, so my guess was that was depositing water.
To be honest we never really had major issues until this year, only difference being that we have not had the heating on for long periods.
The whole house is suffering with condensation because of this and I am working on remedies where I can.
I have subbed great looking channel
I must admit we have found we are suffering from condensation on the windows but im guessing its a combination of heating, cold weather and old windows!
Really great video, well presented and almost exactly what I needed. I think it is the only video on youtube showing the staggered formation. I said almost as the only thing missing was how to stagger these felt lap vents on the other side of the roof space. Is it perpendicular to the staggered formation on the other side, but then again the middle might be straight opposite. Even the manthorpe's installation guide was not at all clear and did not mention staggering at all. I think Manthorpe's instructions said to put one at the eaves and one at the top, miss one rafter gap and do the same. On the opposite side they did not say anything and logically it should mean if on one side one has put them 1,3,5 on the other side 2,4,6 for example, but these are not staggered. Maybe an F1 wind tunnel experts are needed to calculate most optimal position, hahaha. Great video irrespective of my questions.
Hi, more molecules. Thanks for your comment and question! Firstly, by staggering the felt lap vents, it will create a varied air flow entering the loft. Now, on the opposite side of the loft, stagger the vents in a pattern that doesn't match the other side and put them as you say 1,3,5 and 2,4,6. You are trying to create a turbulent air flow within the loft and avoid the air entering and exiting too quickly. Hope that makes sense?
@@FixitwithFowler Many thanks indeed for the really quick reply. It makes sense to stagger them in a way that the air does not flow directly from one side to the other. I always thought that the air would flow along the membrane from the bottom to the top rather than towards the middle of the loft. I will have to see what staggered pattern I can achieve and if it removes the condensation problem in my loft. Many thanks again. I suspect if a pattern does not work, to modify it and see which one works.
Hopefully it will cure the condensation in the loft for you!
Any videos of installing loft legs for loft boards? Great video and drawing.. thanks 👍
Hi, no, sorry, I've only installed loft legs once and, in my opinion, were useless.
Hi, great video. Iv just had a £800 quote for fitting some sort of ventilation tile for a condensation problem in my loft that has created a small brown mark on my ceiling from a drip in the loft. (I’m not very up on what’s going on up there tbh) Now Iv seen your video I think I may try this first as can’t afford that cost and seems a cheaper option.
Hi Dane, if you replay the first part of the video and make a few notes, im sure you will be fine. If you follow my link in the description it will take you to the vents on Amazon. I would start with ten (5 on ech side) and position them not directly opposite each other. Hope it sorts the problem for you! If you like my channel don't forget to subscribe!
This is a super helpful video - thank you!
We currently have no ventilation in our loft and it was recommended on our surveyors report to install “five vents to the front soffit and five to the rear”. Will this be necessary if we add these lap vents instead? Should we be adding soffit vents in addition to 10 lap vents on each side?
Many thanks.
Hi, there is no need for sofit vents if you install these lap vents. Make sure you unstall them in a staggered formation, i.e., some high, some low, and have a high one on one side matched with a low one on the other. Here is the latest amazon link amzn.to/3qt39yx
That's interesting what you said. I always thought that the soffit vents let in the air from the outside. And the higher roof vents were there to let the warmer air that rises, leave the loft .
Hi, newer lofts have a breathable roofing membrane normally accompanied with vented eves and a vented ridge (top of roof space). Older lofts like the one in the video have none of that but some have vented sofits (outside near guttering) only if they have been retro fitted. These vents definitely help to create a vented loft space which will not only help with condensation in the winter but cool the loft in the summer. Hope you liked the video, don't forget to look at my other videos!
@@FixitwithFowler my meaning was for older roofs with old felt,. And the use of manthorpe lap felt vents,.
You suggested air from outside flows under the tiles and through the vents.
So how does the old air escape????
Oh right! The vents are positioned on either side of the loft (slightly staggered and at different heights). When the wind blows outside the air is forced into the loft on one side (as per the whiteboard explanation). This increases the pressure in the loft and forces out the older air. Hope that makes sense?
@@FixitwithFowler Hi, if my property doesn't have vented soffits is there any point in getting eave vents will lap vents be suffice.
Hi, the lap vents should be good enough on their own. I would suggest installing 10 - 20 depending on the size of your loft. If you follow my amazon link, that's the cheapest i could find!
Hi there. Great vid. Will installing these help reduce condensation on the upper floors of a property?
Hi Banno, Thanks for your comment! I have found these to be a cheap solution to roof ventilation and highly recommend them! Have a look at my other videos and don't forget to subscribe 😉
Great video
Could I add 30 to the roof.
If I add max to my roof will if clear all.
My loft does drip when winter is here and the loft insulation has black spots. So I hope to add as many as I can to the roof
3 bed end Terence
Thanks
Hi Vic, Yes, you can but normally 10 each side is sufficient. You need to stagger them to create a turbulent air flow. If you follow this link you will get them cheaper amzn.to/46VH6RC
Hi great video, I had the same felt removed and new door fitted as my house was built in 70s. I have recently noticed condensation on the new roof left. I believe it’s breathable felt. Would this vents be ok to use with this ? Thanks
Hi, these vents are for any type of roof membrane or felt and are designed to increase ventilation. If you have vented sofits then make sure youmove the insulation away from the eves. amzn.to/3t0hK5S
Hi pal love the video
I’ve got a lot off damp mostly
down back side of loft felt and patches on the wood that runs down it’s a 1930 house no soffits just big vents at top of house I assume these are for the loft any suggestions on how to cure problem as it does wet inside daughters bedroom and sons box room
Hi, firstly, thanks for your comment on my damo in the loft video. Do you know if the damp in the bedrooms is on the ceiling or walls?
Thanks for your response in my sons box room it’s on the gable wall where the bed is against seems to be when weather starts getting colder
Ok, so this video is designed to cure damp or heat in the loft by increasing ventilation. By increasing ventilation, you minimise any difference in temperature, which eliminates condensation and dampness. Normally, if damp is on an external wall, then i would suggest looking at the outside of the house for any tell tail signs of water ingress.
Great video but I wish I could find them at £2each. Also, the space between the rafters in our older house is around 33cm. Are small ones of these available?
Hi Paul, At the time of filming, i got the felt lap vents from amazon at £20 for 10 of them. However, they are now around £3 each! These are 33cm, so it might be a bit too tight. You could trim the felt lap vents down to fit. Check out my other videos, and don't forget to subscribe 😉!
@@FixitwithFowler Thanks for your quick reply and advice. I'll subscribe. Take care
Any reason these couldn’t be trimmed down width ways to fit rafters with narrow gaps? Mine vary between 25-30cm. Thanks
Hi, i don't see why you couldn't trim them down if you're careful. They have made a massive difference in my loft, and now theres no condensation whatsoever. Let me know how you get on with the lap vents!
I live in a newer property that has vents in the soffits and a dry ridge system. However, we still ended up with condensation and mould on the membrane, and it would appear that everyone else around us is in the same boat. I’ve just started to install these lap vents, but I wasn’t sure how to best place them. I’ve generally put two in each gap (one just up from the soffits, and another further up towards head height), then skipped a gap to do the next one. When completing the opposite side, I then did the same, but staggered them by one gap to prevent air coming in and going straight back out. My roof has three sides to it, so I’ll need about 35 vents at a cost of £90, but having 12 traditional tile vents was going to cost £900! Any help is welcome if I’ve not done this correctly. I’m going to re-do the loft hatch seal today.
Hi John, It sounds like you have installed them correctly. Not only do you require an airflow in the loft, but you need the air to circulate. By positioning them in alternate gaps between the rafters and not inline with the opposite side of the loft, you should achieve a dry loft. It sounds like you have installed them perfectly! Just have a quick check to make sure any ducting is connected as it should be as i have come across this before. Thanks for your comment, and dont forget to subscribe 😉
@@FixitwithFowler that was what we discovered in 2021; our guest bathroom extractor pipe was only connected at one end. The other end was in the loft and not connected to the soffit (and someone had stuffed a ball of loft insulation into the disconnected end!). We also found that the loft insulation had been stuffed into the soffits, with the empty bags of loft insulation also thrown into the loft! All fixed now though. It’s shocking the standard of work that some people will happily try and get away with. Thanks again.
Hi John, the problem with new builds is that most work is done on a fixed price and the consequence is normally a lower standard of work. Having said that, there are still some good new builds with good workmanship.
How do you recommend the staggering to go on the opposite side, should you mirror it or just put them all over the place?
Hi stuntmanwill. Your best not to mirror the other side as you want to create a turbulent airflow. Hope that helps!
Hello Steve, a quick question please if you don't mind. My loft is the same or very similar to the one in your video. I wanted to make my current loft to a warm loft. Will I still need these vents which you mentioned in the video please? Many thanks!
You will need an airflow between the underside of the felt and the new insulation. If the insulation touches the felt you will get condensation. I suppose it will depend on the existing airflow in your loft and if you have vented eves or sofits.
@@FixitwithFowler Thanks Steve 👍
What of you have rosemary tiles with no felt. Also seemingly no soffit vents.
Unfortunately, this only works if you have felt!
Hi, my roof felt has begun to perish and has come away in several places exposing the tiles, saving up for a re-roof. Felt suffers bad condensation during winter, one side is south facing, the other north, roof has no vented eaves and membrane is non breathable. White mold patches have appered on the nothe side only, will these vents help?
Yes definitely, read the comments on the video. The ones I used in the video have since gone up in price but these are the equivalent amzn.to/3UVLjzu
Got horrible condensation. All my storage items are wet! Just installed 10 in my loft. Will keep you all posted.
Hi, hopefully, the vents will improve the condensation in your loft.
Update?
@@thebaneofyourexistence.3377 dry throughout and the smell has also gone. Happy days! Checked after a week or so.
@user-bk5yk4lm8g thats brilliant!
Great video but I have a new build house (11 years old now) and have a white breathable membrane. This year it looks like it has mould growing all over it. A picture in place of where the mould is bad has also started having mould growing on it.
Nothing has changed in the loft apart from taking out a lot of junk, but will check for any insulation that may have moved.
I know it’s hard for you to comment but can you think of anything else I can do to stop this mould?
Hi, even if the roof has a breathable membrane, then that doesn't necessarily mean you have adequate ventilation in the roof space. We have had extremes of weather, which possibly hasn't helped. You could make sure any ducting from fans is connected properly and does indeed go outside. Other than that I would suggest adding some felt lap vents for added ventilation
@@FixitwithFowler thank you. I will double check the two fans that connect in the loft, one for the on-suite and one for the bathroom.
@chrispybee, yes, that's definitely worth checking first. You may have disturbed the ducting, and that would definitely cause condensation, which in turn would cause mould!
Will this get rid of lofty smells? I have a piv damp vent and the smell from the old loft insulation. I do have breathable membrane from 2 year old re roof
Hi, as for getting rid of old insulation, im not sure. I have noticed a massive difference in my loft since installing the felt lap vents, and now the loft doesn't even get hot in the summer. If you have removed the cause of the smell, then i would say this will definitely help and is worth it for the cost. amzn.to/3PVLGch
Hey, our loft is only one sided as we are semi detached. Will installing them allow the air to enter and exit? Thanks :)
Hi, I suppose it would depend on wind direction, but it will definitely help the loft to breathe. There are some similar vents to what I use in the video but cheaper at the minute amzn.to/3IKVUaF
I was just wondering if the problem in the loft could cause the water to run down into the bedroom
Regards
Hi, yes, it definitely can. I would start by installing these vents amzn.to/3ZZmk0v as per the video. That should stop the condensation in the loft and hopefully stop the problems in the bedrooms.
Hope you've got a left foot like Robbie fowler haha.
I haven't got vented eaves in my loft. Would these vents still help? Havin a lot of condensation causing a leak
Yes mate, they have made a massive difference to our loft. amzn.to/3H7mIRE
So I have an ongoing issue with droplets on one side of my loft. The North side to be exact. I have installed the felt laps, I have insulated the floor to death. recently I have installed an extractor fan pumping moist air out through the brick vent. Nothing works. I have massive moisture on the North facing side. Any advice would be great as this is an almost impossible situation
Hi, the problem is that north facing roofs is the lack of sun and heat. Can i ask how many felt lap vents you have installed and the position?
We have a property built in 1800s ,it has no plastic fascias, it has a breathable membrane and at the end of the loft space there is a metal vent . The loft is very small as it has been raised and the ceiling tongue and grooved to allow a bigger space in the room below. This means that where the roof begins is very close to the tongue and groove.
Having been up on the lift for the first time I have noticed that fibreglass insulation is pushed down the thin gaps between the tongue and groom and membrane . The lift has a lot of condensation and damp. We have also had a couple of yellow looking water stains appear on the plaster board on two walls since winter arrived. Which I think is due to the insulation touching the membrane . I have had a local builder friend round and he has suggested replacing four of the roof tiles with vent tiles . Will this sort the issue?
Hi, firstly, if your property has a breathable membrane, then it's obviously been re-roofed at some point. Breathable membrane helps with condensation to a degree as it is semi permeable, but the key to reducing condensation is ventilation. You could try vented roof tiles, but that will obviously come at quite a cost. You could try these felt lap vents first to see if that cures the problem. amzn.to/3H7mIRE
@@FixitwithFowler Thankyou for replying, we have got to get the ridge pointed anyway and the roofer is a friend of a friend so shouldn’t be too pricey. I’d try the interior vents but the loft space is tiny and hard to get into.
My partner has had the property for years and we had previously been renting it out before moving back in. She had never had the issues with the watermarks on the walls.
Prior to moving back in we replaced the wooden front door with a composite and the windows in the kitchen for double glazing. I also sealed the gaps In the tongue and groove ceiling and painted .
I am thinking that this has contributed the damp problem in the loft space ? This is why I am hoping roof vents will help . The metal vent at one end of loft space is around 300mmx300mm.
@RANDA11FLAGG Yes, ventilation is the key, no matter how you achieve it. Also, insulation plays a part as this prevents warm air, meeting cold surfaces!
Can you convert a loft with that old type of felt to a room 🤔 thanks
You would need to speak to building control about building regulations as there are loads of things to consider. The felt itself is not a problem.
do you just install this vent to one side of the roof or both side? thx
Hi, firstly, thanks for your comment. You need to install them on both sides of the roof, this allows air to enter and exit the loft/roof space. The other important thing is to not install the roof vents directly opposite each other. This creates a turbulent air flow through the loft/air space. If that helps, don't forget to give the video a thumbs up! Also they are on offer if you follow my linkamzn.to/3XXG0Rg
Hi mate I have the same loft type I was just wondering is the insulation u can see through the gaps have asbestos in. I think the recent owners had new insulation down as it’s more of a yellow colour? Thanks in advance
Hi, no there is no asbestos in the original insulation. The original insulation in my house and houses of a similar age (1960's) used fiberglass insulation which is yellow in color and extremely itchy and irritant. Make sure you wear a mask, gloves and googles or glasses if you are moving any old insulation. Have you installed any of the felt lap vents in your loft?
@@FixitwithFowler hi yes our house was built in the 70s and I did move a little bit of the insulation and it was itchy. Yes I also fitted the felt vents thank u for that
@steveo2009100 no problem mate, the itching does stop after a few days
Hi. Mine has a plastic membrane covering the whole inside of the roof, so what do you suggest? Thanks
I would remove it personally, but it depends on what is underneath it!
Thanks for the swift reply, I'll have a look! 😮
@samuelgillard2196 no problem
Hi, based on your drawing, are you suggestion putting the loft lap vents all on one side of the loft? I currently have them fitted both sides and I have soffit vents and I’ve still got water dripping onto my loft boards
Hi, no, the drawing refers to the difference between vented and unvented lofts. The vents need to be positioned on each side of the loft at different heights but not directly opposite each other. This will then create a turbulent air flow through the loft. Let me know how many vents you have and also the size of your loft.
Hi, I currently have 20 lap vents fitted in a staggered position as you suggested. My loft is massive. It’s pretty much the size of the ground floor (bungalow)
@4KTV87 Hi, have you checked that the insulation is not pushed right to the eves of the loft as this will also restrict air flow?
@@FixitwithFowler
Ĥi a roofing firm has put vents in my loft to help with condensation but is blowing gale through there gone worse I live in end terraced house when government was giving loft insulation by way of grant they laid new thicker insulation over old one and think it may be covering air vents at front and back can you please advise me thanks 😊
@joycemcchrystal1064 Hi, the idea is to add ventilation to prevent or cure condensation in the loft. So long as the loft insulation doesn't cover the vented sofits if you have any you should be ok
I don't have vented soffits or facias, is that an issue? Also, do I have my insulation like on the right of your drawing (butted up) or left please? Thanks
Hi, you don't need to have vented sofits or facias, and in fact, these felt lap vents are designed to increase or create ventilation in the loft to avoid condensation in the winter and build up of heat in the summer. You need to have your insulation like the drawing on the left and make sure it is not touching the underside of the roofing felt. Any more questions, give me a shout!
@@FixitwithFowler thanks so much for the reply and advice 👍
Hi, no problem, the whole idea of my channel is to help people save money so i am always happy to help!
Can these roof vents be used on roofs with breathable membrane? If so, can you explain how these would be fitted? Thx
Hi, yes they can and the process is exactly the same as on the video.
Thank you. Will give it a try. The problem I had also was a wet chimney breast in the loft and the rafters on that wall. Do you think that’s caused by the condensation also or is a separate problem?
This is a link to the vents amzn.to/3GGrm9i the damp on the chimney sounds like a problem with the lead flashing around the chimney itself. Hope that helps. Please subscribe to my channel for more great videos!
What if there is no soffit/eave vents will it still work can only see the feltish material from the outside
Yes, it will still ventilate the loft/roof space. You may need 20, though, to create enough air flow, but it depends on the size of the loft! www.amazon.co.uk/dp/B00M97O5YY/ref=cm_sw_r_as_gl_apa_gl_i_TWMPB785GDBHEQY34RY3?linkCode=ml2&tag=fixitwithfowl-21
Thanks alot for the prompt response much appreciated
@sulaimanm2472 no problem, i always try to respond to all the comments on the videos!
Hi there, any chance of a link to buy those felt vents please 👍
There is a link in the description byt heres a direct link amzn.to/3R0p6hM hope that helps.
Thanks 😃
@karlevans7214 No problem, any questions when fitting the felt lap vents give me a shout!
I live in a Victorian terraced house and have condensation in the tenemant section . So I dont have two sides to the roof, as the other side of the roof is the neighbours. Seeing as I only have one side of a roof will these vents still work or will it not create the required turbulence ?. Thanks
Hi, it will definitely make a difference to the air flow as once air blown inside the loft the the air inside the loft will be forced out. I would recommend trying it as it's the cheapest option to start with. amzn.to/3Sgr26o
Thanks for the quick reply. After looking at all the positive reviews on Amazon I have ordered 20. I hope they work as I was convincing myself I needed a new roof even though I cannot see any damaged tiles from the outside. Subscribed.@@FixitwithFowler
@Bluejohn, thanks for that, I've not had a negative comment about the felt lap vents, so hopefully, they will do the job, and thanks for subscribing!
Will this help with humidity? My loft in loft averages around 85%. I've used an aqara temp/humidity sensor to monitor
Yes, it should do. Increasing the ventilation in the loft it will reduce the humidity.
@@FixitwithFowler thanks. Just bought some.
@2377shortie hopefully they will sort out the humidity!
@FixitwithFowler 10 didn't do the job so I have bought 10 more. Is it best to stagger the other side. So if the left side starts low should the opposite right side start high?
@@2377shortie yes definitely stagger them as that will create a turbulent air flow
What if you don't have any felt? Mine are tiles nailed to battons
Then, unfortunately, this won't work. However, you can add ventilation by vented sofits or vented tiles, but it's not as easy as these felt lap vents!
@@FixitwithFowler could I drill a hole in the soffit from inside the loft and then fit a vent from inside with a fly screen?
Yes, i don't see why not. You can get vents to put in the sofits like these! amzn.to/3S8L1Uv
Hi my house was built in 2007 so I have vented eves and all clear but I am getting condensation under my loft boards, should there be a gap between the insulation and loft boards as I haven't got a gap or will these Lap Vents fix it ??
I have loft insulation touching the underside of my loft boarding. These air vents definitely help with condensation.
Yeh mine is also touching the underside of the boards, we have a 4 bedroom house with 16 solar panels on the front so a decent size roof how many of these would you suggest?
Hi, i would recommend 10 felt lap vents on each side of the loft.amzn.to/3RgbOO8 This should be sufficient to increase the air flow through the loft but ensure you fit them in a staggered pattern as per my video.
Will they fit on breathable felt what is much thinner
Hi, yes these felt lap vents will fit on the breathable felt amzn.to/3TNySH9 help that helps
@@FixitwithFowler will try.had a new roof fitted. Getting condensation.
@ttopcat264 these are definitely worth a try, cheapest option by far!
My roof is an old stone roof with back pointing. Ive noticed condesation. But i have no felt as its that old. Until i have the roof re done would these slot beneath the stone and do the same job. It should i just bore a vent into the wall ?. Thanks
Hi, unfortunately, these won't work. It would be best to install vented eves (if possible), or the other option would be to put a vent through the wall.
@@FixitwithFowler I was going to vent a six in hole in the gable end possibly either side to try get cross flow it's insulated to the wall that separates the loft hatch but I'm getting condensation behind the hatch if it makes sense
@robertmij7425 yes that a good idea. Has your loft got 300 mm of insulation, and is the hatch insulated?
@@FixitwithFowler it's got an insulated hatch and it's kingspanned and boarded with adequate airflow. More than the recommended 50mm to the tiles. But only to the loft hatch partition.
@@FixitwithFowler and is the 300 mm the loft hatch rolls on the floor of the eaves you mean. Sorry for all questions
We have a loft space that was converted by the previous owner. It has no insulation and is gettimg condensation in the loft space either side of the loft conversion. Can i put these lower down and not worry about the higher up ones as i have no acces to them. The conversion is a plasterd room.
Hi, the condensation comes from lack of ventilation, so these felt lap vents are definitely worth a try and by far the cheapest solution to condensation in your loft. These are the cheapest at the moment amzn.to/3sYqREc
I have ordered 10 vents, should be with me tomorrow. Im wanting to insulate the roof space above the conversion, do i need to leave a space between the board I slide up and the membrane?
@natetaylor564 Yes, you need to leave a space between the insulation and the roof membrane as you need an airflow to prevent condensation. The insulation should sit directly on the back of the plasterboard. Hope that helps
Yes cheers. I'm going to gapo tape the sides of the board andslide it up. It's a very tight space so try my best. Had a load of quilt lay on the rafter at 90° and minimal in the rafters. Can I lay that into the rafters and then osb over the top to make abetter platform for working in there?
Also I only ordered 10 vents, I saw a comment saying 10 - 20
Chop out gable end and fit 2 air bricks 215x 140 one top one bottom 😀
I had one each end, but these are the way forward. No tools required, cheap as chips, and the best thing is no need to work at height!
Ok I will give it a go next time
Help please!
I have recently re boarded plastered and insulated ceilings in my 100 year old house or so. We've layered 300mm of insulation and have a bitchumen material underneath the tiles. I have installed roughly 20 of these lap vents and there is a lot of draught throughout the roof. But yet on the northern side of the roof we have white spores of mould growing on the wood which is touching the roof felt. We are unable to get ventilation on the soffits and faicures as there isn't enough room or enough overhang from the roof. I plan on putting a dehumidifier up there for a while but unsure how to stop the problem! Any help would be appreciated massively!!
Hi, will is it just the north side of the roof/loft?
@@FixitwithFowler hi there yes it is! Seems to be mainly above the roof hatch + boiler
@Will_C2112 Hi, is the loft hatch insulated?
@@FixitwithFowler hi there yes the loft hatch is insulated but could possibly do with being a little bit more so
It sounds like you may have a thermal leak there into the loft if it's worse there. When did you install the felt lap vents?
its work?
Yes, they work really well! You normally need around 20 felt lap vents to create good ventilation in the loft!
@@FixitwithFowler thansks i will buy 20
@Lokman1210 thanks, these are the ones I used in the video amzn.to/4bfi0Pt but these work exactly the same and loads cheaper amzn.to/3wDLkQo.
I have this problem with wet joists and a feeling of dampness in the loft of our Victorian semi. We had a re-roof 2 years ago using our old and new slate tiles, roof membrane etc. I installed 10 lap vents and this still hasn't solved the problem 3 weeks on. To be fair, it's been exceptionally cold with hardly any wind movement but a week ago we had a lot of wind and dry air. I would have thought that would have started the drying process but it seems to have got back to how it was, which I thought there would be no more build up of moisture due to the vents letting it escape. No leaks in the roof as such and all tiles look sound from outside. Feeling under the membrane in the worst areas the battens feel wet too. Should I fit more vents and give it longer ?
Hi Ian. Unfortunately, there are many different grades of roof membrane starting at £40 a roll up to £140 a roll for a fully breathable roofing membrane. Have you checked if the loft insulation is upto spec 300mm deep and clear of the eves? Also check if you have vented eves or sofits, as a new roof should have vented eves. You could try installing more felt lap vents, i normally suggest between 10-20 per roof space. Hope that helps! Don't forget to subscribe to my channel for more great content 😉
@@FixitwithFowler I can't say what the membrane cost but I was told it was breathable. I don't remember it being damp last Winter since it was done but it has been very cold, and wet this year, and we haven't had the heating on much. Don't think there were any eve vents fitted. The insulation I put down a few years ago is thick, but only covers each side of the loft as boarded in the middle for storing items (a lot of stuff presently)
Hi Ian, do you have any fan ducting in the loft? If so you could check it isn't damaged and does go outside. The other thing is to insulate your loft hatch. If all of these are ok the try adding more felt lap vents
@@FixitwithFowler No fan in the loft and the hatch has some foam door type insulation. It just seems odd that the vents already fitted have hardly helped. I will order some more anyway, or find bits of plastic pipe to slot in to give the same effect.
When you install the felt lap vents, make sure you can either see daylight or feel a draught. If the felt is overlapped by a long way, it is possible that the vents aren't opening the felt
😅i have condensation in my loft a roofer has been to look he never mentioned ventilation which i know there isnt any he said the membrane was wrong the tiles needed removing and the membrane replaced the tiles refitted at a cost of 8k still in panic mode
Obviously, without looking, i can't comment. However, i would be sceptical of such a claim if it was me. A second opinion would be a good idea. However, as you said, the cause of condensation is lack of ventilation and / or lack of insulation. These vents are ideal to add ventilation, and at only £20-£30 a pack a definite option to try first! amzn.to/47xxMm1
Ordered them thanks I've put the dehumidifier in the loft to dry it out and I am going to pull the floor lagging back from the eaves for more air cant think if anything else
Put in all the vents I needed 2 packets in roof also resealed loft door after a week the loft is bone dry thank you very much 😊
That's amazing, and it's saved you £8000! That's what my channel is all about. Please share the video to help my channel grow and reach 10k subscribers!
Would you say it worked because of the vents or because of the dehumidifier etc?
We’ve had new fascias and soffits fitted a year ago….and they have NOT got vents…….now we are having mould grow on the corners of two rooms…..any ideas what we can do? Had several roofers round and they have given different and costly answers!
Firstly, i would check that the loft insulation doesn't touch the roofing felt at the eves (lowest point) of the loft. Have you got condensation in tge loft?
Yes lots of condensation @@FixitwithFowler
Firstly i would try these felt lap vents
amzn.to/418y695 . What loft insulation do you have?
Will it help even if we have no vents in the eaves or roof? @@FixitwithFowler
By what you've told me, i would suggest adding the felt lap vents to increase/add ventilation in the loft. That will help reduce the condensation. However, if your loft insulation is less than 300mm deep, you will need to top that up. Ultimately, the mould comes from water/damp so that could be caused by the loft condensation or a leaking roof.
Can you have too many fitted?
No not really, i would recommend between 10 and 20 felt lap vents depending on the size of the loft. They should be placed on each side of the loft but not directly opposite each other. That should cure condensation in the loft!
Thanks mate I’ll give it a go, fingers crossed. Like many others I’ve been given advice by roofers that would’ve cost me thousands so hopefully these and clearing the soffit vents does the trick 🙏🏻🙏🏻
@mikedwyer3108 hopefully, let me know if you have any more questions about condensation in your loft!
Won't squirrels and bats feel invited to party?
I have not had any yet, I did worry about wasps coming in, but so far, so good
Tried these didn't work for us
How did you install them?
Didn’t work for us either. Bizarrely I found a solution, which improved the condensation problem. My loft was fully ventilated and was very cold. One day I decided to block some of the ventilation around the eaves and take out the plastic vents I fitted. Straight away the temperature in the loft increased and the condensation reduced. On very cold nights, I use a 240 W tubular heater to increase the temperature a little more and this pretty much stops the condensation. Of course a cost is involved here, but I estimate it to be less then £2 per day and I would happily pay much more to rid myself of the worry of condensation.
I’m not saying this solution works for everyone, but it did work for me.
It depends on the heat escaping from the rooms below into the loft. it's that heat meeting the cold underside of the felt that creates the condensation in the loft!
Thanks
No problem, hope you have managed to cure the condensation in the loft