After the Grenfell fire (yes, that's after the worst of several) the BRE was at last commissioned to run fire tests on a rig simulating part of a multi-storey block.
This was the extra, 7th test, using a core filler of fire-retardent polyethylene.
(perhaps I should say "so-called")
https://www.gov.uk/government/uploa...test7_BS8414_Part_1_test_report_Issue_2.1.pdf
Read chart 5.2
on pages 10 and11
Ignition at 00min 00 secs
By 06:32 flaming debris was falling.
By 17:00 the next floor up was afire
At 28.14 the test was terminated
What a shame nobody thought of carrying out the tests before fixing this stuff to people's homes.
"This test result, however, raises major questions about why this combination of materials was actually signed off by building control officers.
The fire test conducted by the BRE is a standard test which is designed to establish whether a specific combination of materials, installed in a specified fashion, will be safe during a fire.
If developers wish to use combustible material on the exterior of tall buildings, it is supposed to be on the basis of data from such a test.
Newsnight has, however, previously revealed how developers have installed combustible elements on tall buildings without having tested the components.
They can commission engineers to write reports arguing that the material is functionally similar to material that has already been tested.
Or, in one case, Newsnight found building inspectors willing to sign off material of the same combustibility as at Grenfell without even that level of evidence.
The publication of this test makes it impossible for this design and combination of materials to be used in future without it passing a further test. "
http://www.bbc.co.uk/news/uk-40735851
What a shame the regulations were so lax. What a shame we didn't have housing ministers willing and able to do their job.