Simon Buckmaster at James Hardie discusses how the Building Safety Act has reshaped facade installation, from fire classification and product selection to competence, documentation and the need to rigorously specify, install and evidence work done.
The Building Safety Act has changed more than the regulatory landscape. It has changed the culture of construction and for facade contractors that shift is now very visible on the ground.
Product choice, documentation, installation practice and competence evidence are all under greater scrutiny than they were even two years ago. For those working on external walls, this is not a distant compliance conversation happening between clients and principal contractors. It is arriving in tender requirements, pre-construction meetings and practical completion checklists.
From classification to comprehension
One of the most tangible changes for the supply chain is the move away from older national fire testing classifications towards the European system, BS EN 13501. Ratings such as A1 and A2-s1,d0 are now becoming standard reference points across facade specification; for anyone selecting or installing external wall materials, understanding what sits behind those letters and numbers matters.
A2 denotes limited combustibility. S1 indicates very low smoke production. D0 means no flaming droplets or particles. Many clients and homeowners now recognise the term ‘fire rated’ but may not fully understand what it means in practice. For trades working onsite, being able to explain this clearly to architects, contractors and clients alike is increasingly a standard feature of the job.
What the HRB threshold means
The ban on combustible materials in and on the external walls of buildings over 18 metres has already reshaped specification habits across the sector. But the implications extend beyond the cladding board itself.
Insulation, membranes, cavity barriers, fixings and subframes all form part of the external wall system. A material that performs well aesthetically, matches a specification visually, or is more readily available may not carry the right fire classification or be suitable within the required wall build-up. Getting this wrong, or assuming that one compliant product makes the whole facade compliant, is one of the more common risks on site.
The Higher-Risk Buildings regime has reinforced this. For buildings of at least 18 metres (or seven storeys) containing two or more residential units, as well as hospitals and care homes, building control approval must now be secured before work begins. Applications must demonstrate both regulatory compliance and management competence. Facade contractors and subcontractors are consequently more likely than ever to be asked for product certificates, installation records, technical data sheets, warranties and photographic evidence of completed work.
Documentation
The instinct to treat compliance paperwork as an administrative task saved for the end of a project is no longer viable. Evidence of what has been installed, how and by whom is now central to how higher-risk building projects are managed and approved.
This has a practical consequence for how facade contractors approach procurement and installation. Early engagement with manufacturers and technical teams, before products are ordered, before details are fixed, before work begins onsite, reduces the risk of substitutions, queries and delays later in the programme. It also creates a cleaner paper trail from the outset.
For installers, one of the most important principles is that a product’s fire classification does not automatically mean the whole facade is compliant. Overall performance depends on the complete construction, how products interact and whether installation reflects tested or assessed details.
Cavity barriers, movement joints, penetrations, fixings and ventilation gaps all require proper attention. Cutting corners in any of these areas can undermine the intention of the specification, regardless of how well the primary cladding product specified performs.
Manufacturers have a significant role to play here. Clear technical guidance, tested product data, installation instructions and accessible project support help contractors make better decisions and reduce risk.
From September 2026, updated Approved Document B guidance will recommend more than one common stair in HRBs, alongside provisions to support evacuation lifts. This is primarily a design-stage matter but it will have downstream consequences, affecting stair cores, escape routes, protected shafts, lobbies and the points where the external envelope meets the wider building design.
The regulatory direction is clear and it is not going to reverse. Fire safety requirements will continue to become more detailed, more evidence-led and more closely scrutinised.
Simon Buckmaster is operations & technical manager at James Hardie