The Health & Safety Executive (HSE) has written an ‘open letter’ to the timber-frame industry, warning about fire risk during construction.
The HSE said “it acted in the wake of serious incidents where fires involving timber frame structures under construction have affected neighbouring buildings”.
The letter was produced in conjunction with the Structural Timber Association (STA), which represents the industry’s manufacturers and suppliers.
In September, fire ripped through a partially-built laboratory at the University of Nottingham, where the frame was constructed mainly from glue laminated (glulam) beams. Morgan Sindall was main contractor on the project, which had been designed to achieve a BREEAM “outstanding” rating.
"Evidence from recent HSE inspections indicates that the risk of harm to occupants of neighbouring buildings from fire during the construction phase is not always effectively managed, and that not all duty holders understand what is required of them."
Simon Longbottom, HSE
HSE head of construction sector & policy, Simon Longbottom, said: “Serious incidents have arisen where fires involving timber frame structures under construction have affected neighbouring buildings. Consequently, HSE has worked with the STA to produce guidance on reducing the risk of harm to people in buildings adjacent to the construction site.
“Evidence from recent HSE inspections indicates that the risk of harm to occupants of neighbouring buildings from fire during the construction phase is not always effectively managed, and that not all duty holders understand what is required of them.”
He added: “Regulation 11 of The Construction (Design and Management) Regulations 2007 (CDM) requires risks to be designed out as far as is reasonably practicable. This duty is imposed on anyone who makes decisions affecting the design, including architects, structural engineers, clients, suppliers, principal and other contractors and even those involved in the planning approval process where they specify particular construction methods or products.”
The primary legal responsibility for assessing off-site fire risk rests with those making design and procurement decisions before work starts on site, Longbottom said.
“Designers and manufacturers of timber frame structures have duties under CDM Regulation 11 that cannot be passed on to the principal contractor,” he explained.
“Risk should be designed out as far as possible and information about residual risk must be passed to the principal contractor, who is then obliged to consider and manage risks arising from the activities under their control at the site stage.”
How can there be any more risk from a Glulam Structure than from trussed rafter roof construction; the latter are used as standard practice and even built into the majority of stone age walling structures.
This is targeted ARSON.
However to mitigate against further ‘mysterious fires’ why not coat timber in something like Albiflame or some other intumescent coating as part of the Building Regulation requirements?