Concrete wall
of tower
Foil coating
50mm
gap
Polyethylene
3
2
1
Aluminium sheets
1 Insulation layer
Celotex RS5000 has performed well in a number of fire tests, but it is combustible. Made from polyisocyanurate (PIR), it releases toxic fumes such as hydrogen cyanide when it burns
2 Air gap
The air gap ensures that condensation on the building evaporates and doesn't damage the outer walls. The gap may have helped the fire spread through a ‘chimney effect’
3 Cladding
Reynobond panels used on Grenfell Tower sandwich a layer of polyethylene between two aluminium sheets. The panels are flammable and official building regulations recommend that only panels with non-combustible cores are used on buildings taller than 18 metres
1 Insulation layer
Celotex RS5000 has performed well in a number of fire tests, but it is combustible. Made from polyisocyanurate (PIR), it releases toxic fumes such as hydrogen cyanide when it burns
2 Air gap
The air gap ensures that condensation on the building evaporates and doesn't damage the outer walls. The gap may have helped the fire spread through a ‘chimney effect’
3 Cladding
Reynobond panels used on Grenfell Tower sandwich a layer of polyethylene between two aluminium sheets. The panels are flammable and official building regulations recommend that only panels with non-combustible cores are used on buildings taller than 18 metres
Concrete wall
of tower
Foil coating
50mm
gap
Polyethylene
3
2
1
Aluminium sheets