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The external walls of Grenfell Tower should have been checked during a fire risk assessment, the Grenfell Inquiry has heard.

Arup fire consultant Barbara Lane contradicted an earlier expert witness, consultant Colin Todd, who told the inquiry he did not believe the tower鈥檚 external walls were in the scope of most routine fire assessments.

Former firefighter Carl Stokes, who carried out a risk assessment of the building for Kensington and Chelsea Tenant Management Organisation (KCTMO) prior to the fire which claimed 72 lives in June 2017, had not deemed the external walls or their cladding in scope of his checks.

The view appeared to be supported by Todd, who argued that the assessments should be focused on internal parts of the building.

But yesterday Lane told the inquiry in its first week after the summer break that the walls, including the combustible cladding system, should have been considered where they were in contact with the building鈥檚 apartments.

She said in any building where the external walls abut the internal compartments, 鈥渢he external wall is a fire safety provision鈥�.

She added: 鈥淚 can鈥檛 say to a client we鈥檝e sorted out your general fire precautions for this high-rise residential building. I haven鈥檛 looked at the wall. Here鈥檚 hoping it doesn鈥檛 cause extensive fire spread.鈥�

Lane said that if fire was able to spread up an external wall, the 鈥榮tay put鈥� policy for occupants of high-rise buildings in the event of a fire would need to be reconsidered.

鈥淭he truth is that if extensive fire spread can be supported in a wall 鈥� not all external walls are a hazard 鈥� but if it supports fire spread I鈥檓 unable to say to the responsible person the classic evacuation strategy [stay put] remains suitable. I may have to change my evacuation strategy because I can鈥檛 rely on that wall.鈥�

Stokes had advised KCTMO that the cladding complied with 好色先生TV Regulations, but he had based this on the system鈥檚 approval by building control and had not carried out his own independent assessment of the materials used.

However, he had also advised KCTMO to seek assurances on the compliance and fire rating of the tower鈥檚 cladding.

But Lane told the inquiry that there had been a 鈥渟ignificant failure鈥� by Stokes by not explaining the consequences of not acting on the advice in his risk assessments.

She said that 90% of the actions he recommended were 鈥渉igh priority鈥� despite the overall risk being deemed 鈥渢olerable鈥�.

She added: 鈥淚f you are a responsible person and you have a building stock where everything is apparently high priority all the time, you need to sit down and actually understand, 鈥榳hat does that mean? How much risk am I carrying here and how much risk am I causing my relevant persons?鈥�.鈥�

Todd has previously been accused by Nabil Choucair, a member of the disaster鈥檚 bereaved community, of having a conflict of interest after it emerged earlier this year that his son is head of fire safety at the Royal Borough of Kensington and Chelsea.

Bereaved and survivors group Grenfell United has described the alleged conflict of interest as 鈥渄istressing鈥�.

A spokesperson for the inquiry said Todd had informed it of his son鈥檚 intention to take the role, and that the two had agreed not to discuss any fire safety matters related to the council.

Lane is the last witness for the current module of the inquiry, which has focused on the management and maintenance of the tower leading up to the fire.

The next module will focus on the training and preparation of the London Fire Brigade.