An easier guide for the construction industry

An easier guide for the construction industry

A new straightforward guide aimed at making it easier for those within the construction industry to design, choose and install insulation that meets updated thermal performance regulations has been released by insulation manufacturer, ROCKWOOL.

The launch of the ROCKWOOL Guide to Approved Document L 2021 is in direct response to the introduction of Approved Document L (England) 2021, which came into force on 15th June 2022. The changes to Approved Document L (ADL) form part of the Government’s commitment towards meeting its target of delivering Zero Carbon Ready Homes by 2025.

The improved energy performance metrics within ADL have been developed to ensure that all new homes produce 31% less CO2 emissions than those outlined in the previous ADL rules. This means that the construction of new dwellings must comply with these increased energy performance standards.

In light of this, ROCKWOOL has created an easy guide to the new building regulations to support the construction industry in meeting, and exceeding, the requirements. The guide will help users get to grips with what has changed, and how ROCKWOOL solutions can help them meet and exceed the new requirements.

With ADL spelling significant changes to thermal regulations for both new and existing buildings, the ROCKWOOL Guide to Approved Document L 2021 unpacks the updates to Volume 1: dwellings and Volume 2: buildings other than dwellings, plus gives users U-value requirements with a handy side-by-side comparison against the 2013 edition.

The Guide also suggests possible substrate constructions using ROCKWOOL stone wool insulation and, to support users with real-world specifications, explores how to use ROCKWOOL products alongside other commonly specified materials to help realise the updated demands.

Used alongside the ROCKWOOL U-value calculator, those within the construction industry can calculate the specific U-value requirements for their project. It is updated in line with ADL 2021 (where relevant) meaning users can be confident they are working to the latest requirements.

“The changes to ADL are critical in the UK’s journey to achieving net zero carbon emissions by 2050, yet we also recognise that many in the construction industry are busier than ever,” said James Francis, Product Manager, ROCKWOOL UK.

“Our guide to ADL summarises the need-to-know information and supports with practical tools and construction approaches that can be used as a basis for projects.”


Why stone wool

Non-combustible stone wool insulation remains a proven product choice when it comes to meeting ADL requirements. That’s because tiny pockets of air trapped within the physical structure of ROCKWOOL stone wool insulation make it effective at achieving thermal performance. Stone wool can also deliver many other benefits for construction projects, including:


Stone wool is manufactured from naturally occurring volcanic rock. This is abundant in supply because it’s continually replenished by the earth’s crust. While this makes stone wool a sustainable choice, further environmental credentials can be found when choosing a manufacturer that has a recycling process in place.

Natural fire protection

Being made from volcanic rock, makes stone wool non-combustible and enables some insulation products to achieve a European Reaction to Fire Classification of A1 – the highest possible rating.  In fact, stone wool insulation is capable of withstanding temperatures in excess of 1000oC, giving homeowners extra reassurance.

 Noise reducing

Stone wool insulation has added benefits in terms of absorbing sound as it reduces sound vibrations. The dense, non-directional fibre orientation and its open porous structure trap sound waves and reduce sound energy.


Once installed, stone wool insulation is built to last and does not degrade over time. It is also non-hygroscopic, meaning it does not attract water and is vapour permeable. For extra peace of mind, stone wool insulation provides no food source for vermin and does not encourage growth of mould, fungi or bacteria.

Available at the ROCKWOOL Guide to Approved Document L 2021 is an interactive resource, helping users access the information they need with ease.

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