Discuss Good Old Delroy, he gets all the best Jobs :) in the UK Electrical Forum area at ElectriciansForums.net
Cavity's definitely are still filled with insulation! Regardless of what google may say!!The cavity is there to provide a gap and prevent damp from penetrating to the inside skin of the building, wall/brick ties have drips on them to allow the water condensate to reach the cavity tray at the bottom of the wall and drain through the open perps to the outside, its not there for any electricians to run cables in and compromise the drips on the ties.
Do a google search and you will find that cavity's are no longer filled with insulation, it was always a bad idea and many house's have been ruined by the practice.
That's the theory. Real world, even a 9" solid wall doesn't allow significant damp to pass through to the inside, unless it's very exposed to the prevailing wind, or the rainwater goods have failed and are pouring water all down the wall. The odds of significant moisture making its way to the inner leaf of a cavity wall via cables run in the cavity are very low indeed.The cavity is there to provide a gap and prevent damp from penetrating to the inside skin of the building, wall/brick ties have drips on them to allow the water condensate to reach the cavity tray at the bottom of the wall and drain through the open perps to the outside, its not there for any electricians to run cables in and compromise the drips on the ties.
Do a google search and you will find that cavity's are no longer filled with insulation, it was always a bad idea and many house's have been ruined by the practice.
Cavity trays and weep holes are the standard method of draining a cavity, and damage to houses by full fill cavity insulation has been well publicised by the RICS and the Institute of Civil Engineering, you will note below the insulation is only part fill any penetration of this by cables will cause a thermal bridge.I have never heard of cavity trays and weep holes being installed at the base of cavity walls, or of any houses being damaged by cavity insulation. What are your sources for this? Genuinely interested to hear more about this.
I do a lot of work on barn type conversions with no cavity at all, lots of those walls are around 3ft thick some are coated with a tar like stuff because of water ingression.That's the theory. Real world, even a 9" solid wall doesn't allow significant damp to pass through to the inside, unless it's very exposed to the prevailing wind, or the rainwater goods have failed and are pouring water all down the wall. The odds of significant moisture making its way to the inner leaf of a cavity wall via cables run in the cavity are very low indeed.
I have never heard of cavity trays and weep holes being installed at the base of cavity walls, or of any houses being damaged by cavity insulation. What are your sources for this? Genuinely interested to hear more about this.
Mike this diagram is for radon protection rather than damp, see here: Radon Protection in Above-Ground Environments - https://www.safeguardeurope.com/applications/radon-above-groundCavity trays and weep holes are the standard method of draining a cavity, and damage to houses by full fill cavity insulation has been well publicised by the RICS and the Institute of Civil Engineering, you will note below the insulation is only part fill any penetration of this by cables will cause a thermal bridge.
View attachment 96424
We did to, but they were all fully occupied rewires the council tenants were still living in them back in the good old days, so you had to keep disruption and mess to a minimum cant think of a better way to use the cavity pull through old to new lovely job.During my apprentice years we done loads of council houses using the wall cavity as a wire way as more often than not it was quicker and cleaner than chasing (we didn't have twin disc wall chasers back then)
I trained and worked as a bricklayer for a few years in the early 2000s, so I know a little bit about this.The purpose of the diagram was to show the cavity tray which someone said they had never seen, this is all standard building works you guys need to get out more.
No Mike, this doesn't tell us anything.Will this. do, note the perps not filled to act as weep holes to stop the cavity filling up with water and coming out the top.
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Mike, can you please define 'strawmanning', so the forum can understand where you're coming fromThe original issue was and is the use of the cavity to run cables.
Cavity trays are used when solid concrete floors are cast supported by the ground or beam and block floors supported on lightweight fill, the construction of suspended timber floors is very rare in this age of quick build, cavity trays where used in all the housing estates I was involved with during my working life in the South of England due to the possibility of marsh gas from the clay sub-soil.
On Insulation the latest perceived wisdom is partial fill of cavities with a minimum of 50mm gap between insulation and the outer skin.
There are lots of references to the use of cavity trays at the base of buildings, so it's strange that with all your building knowledge you hadn't heard of it before, It should make you happy that you have learnt something from Mike because as you have said in the past you come on here to learn.That's the theory. Real world, even a 9" solid wall doesn't allow significant damp to pass through to the inside, unless it's very exposed to the prevailing wind, or the rainwater goods have failed and are pouring water all down the wall. The odds of significant moisture making its way to the inner leaf of a cavity wall via cables run in the cavity are very low indeed.
I have never heard of cavity trays and weep holes being installed at the base of cavity walls, or of any houses being damaged by cavity insulation. What are your sources for this? Genuinely interested to hear more about this.
I agree it's entertaining, I would place it in the category of comedy.His one endearing quality is that he has no airs and graces and is not afraid to say that he doesn't know what's up.
Obviously unscripted, completely as it happens.
So many other channels present the activities as a polished perfected series of events where everything seems to go flawlessly.
While my reaction usually ranges from "hmmm, that's a bit iffy" to "WHAT??!?!?!" I still usually find it an entertaining watch.
Think he means STRAMETT BOARDMike, can you please define 'strawmanning', so the forum can why understand where you're coming from,That's why T don't comment that much
He doesn't like to be criticised that much does he?The obvious one that springs to mind was him taking down a wall and then jointing cables in a wago box and ----ing it up into the ceiling and calling it MF. The materials and method he used did not constitute a MF junction box. I politely noted it on his comments and he removed the comment ?
His son does all the web stuff, and I'm guessing he would find it difficult to tell his father that even after 40 years experience in his job that he's still blissfully ignorant.Think he means STRAMETT BOARD
He doesn't like to be criticised that much does he?
I agree in this instance, using the cavity would be reasonable.ah, those beads that get pumped into cavities sometimes, fair enough.
I only asked because in the video the room has a short wall all the way round, presumably the cavity is open at the top, and i guess with rockwool or celotex in the cavity, so running cables through it would seem a reasonable way to do it in this instance, same as you see in alot of conservatories. Delroy was 'teaching' the new lad and said you weren't allowed to do that but he didn't know why......
My point would be that in this instance he can ensure that no breach would exist as it's open and low, giving easy access.I'm sorry, but using the cavity to run cables is not reasonable or acceptable in any circumstance, possible bridging of the cavity tie which has a drip on it to allow moisture to drip to the bottom of the cavity, but any penetration of the skin/insulation will introduce a thermal bridge, in a conservatory the correct way would be to run conduit in the floor, if the inside skin is fair faced brick then the back of the brick on the inside face is chased out to provide a passage for the conduit.
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