Research and analysis

Table 4: descriptions of large-scale system tests undertaken by the BRE and the number of buildings with similar cladding systems, 31 July 2020

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Large-scale system test ACM cladding category tested Insulation type tested Result Private Buildings Local authority Housing association Publicly-Owned Buildings Total Buildings
1 Category 3 Foam Insulation Fail 41 9 29 2 81
2 Category 3 Mineral Wool Fail 22 33 48 0 103
3 Category 2 PIR foam Fail 4 1 3 0 8
4 Category 2 Mineral Wool Pass 5 1 5 1 12
5 Category 1 Foam Insulation Pass 0 0 0 0 0
6 Category 1 Mineral Wool Pass 0 0 0 0 0
7 Category 2 Phenolic Foam Fail 8 0 13 0 21
N/A Category 3 Not in a systems test Inferred fail 61 2 9 5 77
N/A Category 2 Not in a systems test Inferred fail 19 0 0 2 21
N/A Category 1 Not in a systems test Inferred pass 0 0 0 0 0
Subtotal: Total number of buildings failed BRE test 155 45 102 9 311
Confirmed by local authorities as having similar ACM cladding systems to those which have failed large-scale system tests 138 2 6 1 147
Total number of buildings with ACM cladding systems unlikely to meet Building Regulations 293 47 108 10 458
Subtotal: Total number of buildings passed BRE test 5 1 5 1 12
Total number of buildings with confirmed ACM cladding systems 298 48 113 11 470