Do I Need An Approved Installer? – Can I Just Ask? – Episode 7

The question of whether an approved installer is necessary is one that comes up regularly, and the honest answer is more nuanced than a simple yes or no. Many manufacturers run their own training schemes and approved installer programmes, but the value of those schemes varies considerably, and formal accreditation is no guarantee of quality on site. What matters far more, in practice, is attitude — an installer who is genuinely interested in understanding what they’re doing and committed to getting it right will consistently outperform one who has a certificate but approaches the work mechanically.

The materials involved in a well-specified retrofit are more specialist than what you’d find at a builders’ merchant, but the skills required to install them are not. Lime plasters are mixed and applied like any other plaster. Wood fibre boards are cut and fixed like any other board. Airtightness membranes are taped and detailed like any other membrane. Anyone with basic carpentry or plastering skills has most of what they need — and wood fibre in particular is a notably forgiving material to work with, with good latitude for minor imperfections in installation. BTE’s own specifications are designed with this in mind, and resources like Fibers provide detailed guidance that a motivated installer can follow to a high standard without formal training.

The point made most forcefully in this episode is one that runs through much of the CIJA series: installation quality matters more than thickness, and a modest amount of insulation installed with care and attention to airtightness and continuity will outperform a thicker system that’s been poorly executed. That standard of care doesn’t require an approved installer — it requires the right person with the right mindset.