Some good information imo.
Great video, thanks for sharing!
I was thinking this early on on the video and have been thinking this for years so glad he picked up on this - wtf do we use flat roofs in this country!!!
Some great other points about having a standard design but can’t see it getting past the NIMBYs. Tbh, buildings have got very similar looking anyway and at this point, we’ve really got to question why we’re allowing our children to spend several hours a day in buildings which weren’t designed to last this long and has asbestos everywhere.
merridew@feddit.uk 9 months ago
That was an interesting & informative video that was not nearly as terrible as the thumbnail might suggest.
Not a fan of current trends in YouTube thumbnails.
Syldon@feddit.uk 9 months ago
I have worked in the building trade as a much younger person in the 80’s. I have a fair grasp of physics and chemistry. I consider myself to be halfway intelligent around most issues with buildings. I never built anything with RAAC.
I actually found this information much worse than the opinion I had before it. I wasn’t aware of the sliding due to heat, or the extra stresses caused by bad fitment in the first place. I only found out last night that water makes the material crumbly (literally like the crumble on apple crumble). This really is a can of worms. I can only see this causing an accident. I am hoping they have removed all from working under this type of building material.
tal@kbin.social 9 months ago
I don't think that the issue is actually primarily the concrete weakening when exposed to water -- which does apparently happen -- but rather that the rebar internal to the concrete rusts.
You'll notice that nobody is complaining about "AAC" -- aerated autoclaved concrete -- but specifically reinforced aerated autoclaved concrete. The difference is the use of the rebar.
Granted, RAAC is probably used in places where structural strength is more important -- I don't know if a non-reinforced wall crumbling is as bad as a ceiling that's above someone's head.
The speaker in the video highlighted a new angle that I haven't seen before that I think is notable -- that specifically with RAAC, it's hard to tell if the rebar has been suffering from rust internally, because it apparently doesn't split the way regular reinforced concrete does.
Combine that with the fact that RAAC is particularly prone to rust damage to the rebar, and you've got a situation that theoretically shouldn't come up if the substance is protected from water, but if it does happen is prone to problems, is hard to diagnose, and has a catastrophic failure mode.
Pons_Aelius@kbin.social 9 months ago
There is a FF extension called DeArrow:
The goal of DeArrow is to make titles accurate and reduce sensationalism.
Titles can be any arbitrary text. Thumbnails are screenshots from specific timestamps in the video. These are user submitted and voted on.