Daniel McKane from YBS Insulation explains the thermal and practical qualities which reflective multi-foil insulation solutions are developed to provide, and why these make them well suited for domestic applications in particular
For contractors and architects on a domestic housing project, the practicalities of an insulation solution are just as important as the thermal qualities. Using multi-foil insulation for domestic applications such as internal wall applications or loft wall installations has many benefits for both the specifier, as well as the end user.
Multi-foil insulation is extremely flexible and easy to install. It has zero fibres which removes the need for PPE, as well as minimal waste compared to traditional insulation products. Specifiers should look for products with third-party Agrément approval, as well as Building Control compliance and NHBC acceptance for new build projects.
Multi-foil insulation works by reflecting radiant heat back into the living space, retaining warmth, saving money and providing a warmer environment. It is often very thin and flexible which makes it easy to install using a staple gun and aluminium foil tape.
The reflective outer layers of the product increase the overall thermal performance once installed, with an R-Value of up to 2.10 m²K/W – equivalent to 90 mm of mineral wool. Once taped and sealed, it also works as a vapour control layer to reduce the risk of condensation.
The benefits of internal wall insulation (IWI)
The fundamentals of IWI primarily revolve around enhancing the energy efficiency of buildings. IWI often emerges as the default choice due to its simple specification and installation process. IWI proves especially effective in solid wall construction scenarios, where external wall insulation (EWI) isn’t feasible due to external constraints like historic building status or planning restrictions.
There can be unintended consequences if the inappropriate IWI material is selected and installed – so it is vital that installers liaise with a trusted manufacturer and develop the appropriate design for each project. Vigilance and careful material selection is paramount in ensuring correct specification to ensure the wellbeing of occupants.
Specification considerations
Multifoil insulation is often used in older properties to upgrade the thermal performance of most commonly the roof, but also walls. It can also be used in new builds such as house extensions or new homes.
The cost of living continues to have a ripple effect on our economy – and explaining the cost and energy benefits to a client or end-user can be an important decision-making factor when it comes to insulation specification. Multi-foil insulation solutions are very effective at preventing heat loss and condensation in homes, and therefore reducing energy consumption and bills.
Some products offer a thermally efficient two-in-one insulating multi-foil and vapour control layer. As mentioned above, it works by reflecting heat back into the living space, saving money and providing a warmer environment for the homeowner. One example is made up of nine flexible layers at 32 mm thick, offering a cost-effective solution with an equivalent thermal performance of up to 90 mm of mineral wool, offering the homeowner up to 76% reduction in heat loss.
Trusted manufacturers
Specifiers should be wary of where they purchase multi-foil insulation products, and buy from a trusted distribution centre, trade counter or through the specification route. There may be some cheaper alternatives on the market which can be bought online, but these may not have the required safety testing certificates or perform to UK Building Regulations.
Check to make sure the product has the latest industry-standard certifications, such as BDA Kiwa Certificate of Agrément or BBA (British Board of Agrément) certifications. Products are available which have been BDA Kiwa certified and which are also accepted by NHBC (National House Building Council) – offering increased assurance and warranty for new build customers.
Selecting an insulation product manufactured in the UK further reduces costs and potentially long lead times compared with waiting for products from overseas.
Daniel McKane is managing director at YBS Insulation