Problem inside my roof gable wall (now with better video)
Comments
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I think the steel goes around the building as a band, so it's not just over the windows.Changing the world, one sarcastic comment at a time.0
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BRE have published reports on most of the none trad houses built after the war, so it may be worth getting hold of one of these. They will explain in detail the methods of construction and problems and remedial work required.0
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BRE have published reports on most of the none trad houses built after the war, so it may be worth getting hold of one of these. They will explain in detail the methods of construction and problems and remedial work required.
I'm glad I know that the internal wall is the load bearing wall though, so the damage to the outer wall won't make my roof collapseChanging the world, one sarcastic comment at a time.0 -
Made another video, it's a bit better.
*deleted crap videos, see further down for decent quality videoChanging the world, one sarcastic comment at a time.0 -
When concrete spalls, it is often when the rebar rusts, so it may be the case in your house. The main issue for you is that the pieces of concrete in the cavity could be diverting any moisture on to the inner skin and down to your back door.0
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Made another video, it's a bit better.
I've watched thousands of hours of CCTV of the inside of sewers, but have little experiece at looking at concrete like this, so don't know if what I'm seeing is unusual or significiant... but I'd certainly keep in mind the possibility that the aggregate used in the concrete is causing some kind of damage (spalling?) as a result of mineral crystal growth.
Concrete itself relies on chemical reations which form a crystalline structure which binds the aggregates together. Those reactions and the crystals formed can be affected by factors such as the water/cement ratio of the mix, and also contamination. If you want to take this thought process further then it would be worth doing some research on Sulphate Attack and also the formation of Ettringite.
I'm not saying this is certainly the cause of your problems, but to me those 'sparkles' don't look like something I'd expect to see and I would want to know whether they are significant."In the future, everyone will be rich for 15 minutes"0 -
Well my new endoscope arrived very quickly, and now I have some better quality video
Skip the middle of this one, but definitely see the end from 3:30, there's an unexpected item embedded in the wall (or it might be the end of a rebar)
And if you're bored take a look at all this crap in the cavity wall (this is from a different hole)
Changing the world, one sarcastic comment at a time.0 -
When they used to cast insitu lintels, the rebar often had a hook at each end when it was placed into the concrete, bit like the one in the video. Rubbish often gets slung into the concrete.0
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That is much clearer, what borescope brand was that filmed with?
So it certainly looks like corroded reinforcement has caused the concrete to the outer leaf to spall in cavity. The good news is it looks like it isn't the main structural ring beam. Possibly just some starter bars to link the first floor lift with the gable lift.
I wouldn't lose any sleep over it.0 -
That is much clearer, what borescope brand was that filmed with?
https://www.amazon.co.uk/gp/product/B01EWO99CY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
If anyone wants to see how Laing Easi-form houses were made back in the day:
https://youtu.be/OPXiRRcAeaE?t=348Changing the world, one sarcastic comment at a time.0
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