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That Telegraph report says
The Metropolitan Police has confirmed that while both the cladding and the insulation on Grenfell failed safety tests, it was "the insulation that burnt so quickly". This is not being tested by the Government.
Which is unbelievable.
The use of the term "cladding" is a problem in itself, what we are talking about is "composite panels", usually a metal front and back with an insulating core. And it's the core which is the biggest issue for fire spread, not the metal facia.
The Celotex composite panels used on Grenfell Tower had a PIR / polyicyanuate core, which is highly combustible despite what LPC ratings might lead you to believe, and also produces a highly toxic gas when it burns. Have a look at the youtube video a few pages back.
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This is a bit of a myth. Generally, sprinkler systems use plugs to keep the water from just spraying out of the sprinkler heads and the plugs are held in place by a heat sensitive fusible link. When the heat from a fire breaks or melts the link, the plug comes lose and water sprays on the fire. Because of concern over water damage, only the link at the fire location is melted, so the water is discharged only at the fire location.
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http://www.mirror.co.uk/news/uk-news/lily-allen-sensationally-claims-150-10630690
They've cut off Jon Snow saying he'd heard the same numbers
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I saw it with my own eyes at a fire service demo in 2004 and have been advising clients against using anything other than rockwool ever since.
The building trade have known about this issue for years but hide behind "LPC approved" ratings and similar mumbo jumbo. A good example of this is the Grenfell Tower Regeneration Project planning document;
p. 6. Celotex say FR5000 has "Class 0 fire performance throughout the product in accordance with BS 476 [Part 6]" and that its "surface spread of flame [is] Class 1" with respect to BS 476 Part 7 (https://www.celotex.co.uk/products/fr5000 - link to Product Data Sheet PDF, August 2016, p. 2).
Another thing about PIR are the toxic gasses produced when it burns, particularly hydrogen cyanide. Again, this is well known.
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I think this is the specification of composite panel used on the building, it's PIR
https://www.celotex.co.uk/products/rs5000
Now look at the difference in performance between rockwool and PIR
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Most modern methods of construction use EPS, PUR or PIR panels to some extent. The only non-combustible material to use in composite panels is rockwool (mineral glass fibre) which does the same job but doesn't burn. Architects, builders, surveyors etc. have all known this for years.
It's a really horrific tragedy, I'm so sorry for all those involved.
On the BBC News website;
As a lawyer, he specialised in commercial law which involved dealing with disputes relating to maritime and land transport of goods.
Sir Martin went on to spend more than 20 years as a judge of the Commercial Court and Court of Appeal until his retirement in 2016.
Leading barrister Michael Mansfield QC, who has met survivors of the fire, said it was "unbelievable that lessons are not learned" from the Independent Inquiry into Child Sexual Abuse, which is now on its fourth chairman.
He said that inquiry "did not consult with the families and the survivors" and "the same thing seems to have happened all over again".
Grenfell residents have already pointed to a case in November 2014, in which Sir Martin ruled Westminster City Council could rehouse a single mother-of-five more than 50 miles away in Bletchley, near Milton Keynes.
The decision was overturned by the Supreme Court in April 2015 - but addressing residents' concerns over the ruling, Sir Martin said he was surprised at the focus on one of many cases he had heard.