Soaking wet cavity walls and a defective blocked cavity tray
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- Опубліковано 15 вер 2024
- This video shows the cavity tray was never inspected, and cleared of debris before the cavity wall insulation was installed. The bitumen cavity tray has also broken down, and needs to be replaced. Unfortunately this is a common issue that I come across now. When purchasing a property please consider a proper survey to evaluate defective cavity wall insulation installs, and see if the property is guaranteed, and if the guarantee is actually valid. I often find if there is the smallest of pointing issues on the opposite side of the building internally the guarantee isn't valid.... you may need to budget for extraction, and possible replacement wall ties.
Costs can spiral where scaffolding is needed, cavity wall insulation removal, wall tie replacement, repointing, and ventilation.
Click on my other videos that show other issues of cavity wall insulation where the sub floor ventilation is blocked and rot occurs in the suspended timber floors. All of this work is very expensive to repair, so make sure you instruct a surveyor.
Any questions put them in the comments below, and I'll answer them for you.
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Have you had issues with cavity wall insulation?
I guess im randomly asking but does anyone know a way to log back into an Instagram account??
I was stupid lost my login password. I love any tips you can offer me
Excellent video - Explanation at the end was the icing on the cake. Look forward to more
Thanks Oliver.....some basic stuff that gets missed unfortunately :)
Good investigation to find the cause Ross.
Thanks bud. It just highlights the issues with booked and damaged cavity trays
Brilliant film and explanation, thank you.
Thanks Chris really appreciate the kind comment, there is another one similar on a recent short I’ve done 👍
Brilliant video Ross!Yet another different aspect of what can happen.I would have thought that stainless steel cavity trays should be the norm,so it could be fit and forget.I see quite a few old trays made out of various materials being replaced on youtube. 🤨❤👍
Thanks David…. Certainly a pretty common defect 👍 bitumen was the go to product, but as you can clearly see, it can become brittle and damage pretty easily. Some pretty good heavy duty retrofit trays available now, which I’ve made use of 👍
I've just done this job on my 1962 house, a south facing wall, get all the extreme weather, hot cold, wet windy, and the damp tray was cracked just like that one. But the main reason for rain water getting in was the window fitters had cut the water tray back to the inside line!!!!.
Well done Ken👍 such a common problem! Out of interest how did you know this was the cause in the first instance, was there damp at high and low level? 👍
Great video demonstrating the problem. Is the solution to pull out only the first course of bricks above the window, and install a new tray and waterproofing, or if more than just the first course, how many courses up? Hopefully you don't need to go all the way up to the roof in most cases.
Thanks Donald 👍 I installed a new cavity tray, fortunately really only need to go up 1 course 👍👍👍
Hi Ross, I have come across a similar problem in my gable end cavity wall and, thanks to your explanations, have figured out where the problem lies (I think!). After removing some bricks it is clear that debris is bridging the physical dpc. However, the wall also has cavity wall insulation retrofitted at some point which is mineral wool. This is wet in places up to a height of about 400mm. The house is on top of a hill and the wall is exposed to lots of rain. I think cavity insulation should never of been added in this instance.
My question is if I remove all the cavity debris to 225mm below the physical dpc, could the cavity insulation fall down into that gap and also bridge the dpc at a later date? I know mineral wool is supposed to repel water but be good to get your opinion?
Hi John, I’m glad the video helped you 👍 if it’s getting wet still, there will always be the potential for a future issue. Sometimes debris will bridge the dpc, and you can also get run off from the edges of the cavity tray (if there is one above), which is often overlooked. Many of the bitumen trays are knackered, yet they get injected without inspecting 👍
Mineral wool I find especially the older stuff becomes saturated. I’ve got a video to finish of a recent one. This video might help also ua-cam.com/video/97yblxM5Ijc/v-deo.html
A very old post. See for yourself 👀 if it’s waterproof blog.completepreservation.co.uk/2016/09/06/a-soaking-wet-cavity-wall-in-wiltshire/amp/
Rescue and repair existing of cavity wall insulation
How much will that cost to repair. As I'm having same problems with my living room window over the weekend we had the storm with heavy rain and it came through my living room window and made a complete mess but the daft thing is we have had the same problem for the past 3years it gets fixed by a company called MEARS that work for the LCC they told up that it was fixed every year but never is this time I can't get them to fix the problem as I bought it last year just after they sed it's fixed lol so I'm hoping the my house insurance companie will sort it out wish I could send you pictures of the damage its done on the inside then again dont think it would surprise you
Hi Wayne, its difficult to give costs as everybody charges different prices. In this instance it was expensive as we needed scaff. To be fair lots of people have had issues because of the recent storms, and its probably not that much of an issue if it has only occurred in this freak weather. Having said that, if it is damaging decoration and timber is at risk of decay something needs to be done to fix it ASAP. Drop me an email if you wish enquiries@completepreservation.co.uk. I have some videos I will be posting on cavity tray issues where there these have been retro fitted when I get 5.
Rescue and repair existing of cavity wall insulation
Nice diagnosis of the problem ... but what's the solution?
Thanks :) It needs a new cavity tray installed, as this one is damaged.....a very common problem
Great video. My mams ex council house has had a problem with damp in cavity the wall insulation was wet through. I've cleaned it all out as well as rubble. Is that all I can do. Cheers John.
Thanks John :) Make sure you check the building when its raining heavy for any obvious issues, and make sure there are no issues with penetrating damp in regards to issues with the building fabric.
How long should a cavity tray be? Should it be one continuous tray all the way around the house?
Hi, it should be above openings like doors and windows etc. They also have weep vents now. I've got some good ones on cavity trays ill be posting shortly :)
Is this the type of insulation that's pumped into the cavity,, years after the house was built,?
Hi Paul, yes this has been installed a number of years after the property was built. 👍
Hi - I don't have any problems but have recently found out what weep holes are as i noticed wasps going in/out of mine. Not an issue as i think they are too small at the other side for them to enter. Anyway that led me to your video and i am wondering how the water actually gets into the cavity in the first place? I don't mean if there is a problem i just mean in general. Presumably it is rain? but how does it get behind the bricks outside?
Hi Kevin, simply with driven rain causes penetrating damp issues. Long term penetrating damp, and building defect doesn't help with matters as in this case.
Bricks are like sponges,they suck up water and absorb it, it you get enough rain it penetrates through the brick and travels down the brick into the cavity,from there to weepholes, if there are cavity ties that run downwards while attaching to the frame or brickwork from the exterior wall, that could cause a damp issue
Hey Ross, thanks for these. Where can I get these surveys thuroughly carried out? I want to get a closed cell cavity installation carried out followed by external insulation in the future (this is a few years down the line.) Wanting to retrofit my home to passive House standards with HVAC etc. Is there anyone who carries out the inspections? All I can find is people who want to install the insulation or are saying don't get cavities filled.
No worries Paul 👍Where is the property bud
@@completepreservation in Scunthorpe, north Lincolnshire
Also there's no weep holes in the perpend joints between those blocks either, so there would be nowhere for the water to go anyhow. It'd just build up on the failed cavity tray.
Exactly Darren, most of the older properties never had any, just relied on not much getting in 😂😂😂
I was looking and only just thought when you took the blocks out! As an architectural assistant this absoluteley cracked me up that they did all that and that was something that never crossed their minds!
where was the moisture coming from? if it was in the cavity was there a faulty gutter?
Hi Martin, just penetrating damp on a gable wall bud.
All the insulation is BBA certified, its just that these buildings perhaps aren't suitable as in this video. Fantastic idea, but its the long term maintenance that doesn't get carried out either. Have you got damp issues then?
I see lots of issues with cavity tray defects to be fair bud.... just posted a good one on Instagram stories, of a bodged up tray and joists ends not mucked in.Have a look on my cavity wall insulation playlist for some other builder bodged up trays :)
ere ya go budua-cam.com/play/PLcSNFcNIIrlxCwsC1Ex_xmQl7SuHT3uaQ.html
Agree bud, the long term maintenance is such an important point that people seem to forget. I think if they knew how much the repairs could cost, perhaps homeowners would be more aware
Hi I live in a 1950s house just cleaning out cavity and on the of the house concrete past the floor height
Kids regards
Well done for finding the cause. This video might help with diagrams bud 👍ua-cam.com/video/97yblxM5Ijc/v-deo.html
@@completepreservation thank you best videos on UA-cam thanks bud
Can this cavity wall insulation contain asbestos?
Not the cwi, but the bitumen can 👍
@@completepreservation Ah, okay, thanks. Had plaster removed from window reveals and some cwi fell out of top, plus some black plastic/bituminous stuff. Never considered that could be a possible source. I'll get it tested. Thanks again. Very helpful and informative videos 👍
Best of luck with it all…. And thanks 👍