For decades, the internal plasterboard lining—commonly known as dry lining—has served as the primary air barrier in UK construction. It has been a simple, effective, and low-cost solution that satisfied the relatively moderate air-tightness requirements of previous building regulations. However, as we approach the implementation of the Future Homes Standard in 2025, the UK’s air-tightness targets are becoming increasingly ambitious, signaling the end of dry lining as a viable air barrier solution.

Historically, internal plasterboard has been relied upon because it could easily be inspected, repaired, and improved upon during construction. Air leakage issues were readily identifiable and manageable by simply sealing visible cracks or gaps. This convenience made plasterboard an attractive, user-friendly choice. Yet, with the imminent tightening of air-tightness standards under the Future Homes Standard, which aims to drastically cut carbon emissions from new homes, internal plasterboard alone no longer meets the stringent performance requirements.

This shift in standards necessitates looking deeper into the structure to establish an effective air barrier behind the plasterboard line, rather than relying solely on the dry lining itself. To achieve compliance with these new lower targets, the construction industry in the UK is adapting quickly, exploring new and improved materials and techniques that will provide robust and durable air-tightness performance.

For timber frame construction—a method increasingly favored for its sustainability and ease of assembly—the solution lies in improving the internal membrane layer. Traditionally, these membranes were fixed using staples, a method quick in execution but prone to creating air leakage points. With lower air permeability standards, staples will no longer suffice, and attention must shift to high-performance tapes and adhesives. These specialized tapes seal overlaps, edges, and penetrations effectively, providing a consistently airtight barrier. Ensuring that all trades understand the importance of careful application will be key, as even minor defects in sealing could significantly impact air-tightness results.

For brick-and-block builds, the challenge lies in the porous nature of blockwork. Previously, plasterboard would obscure any minor leakage through the blockwork, but now sealing these blocks directly becomes imperative. Products like Passive Purple—a liquid-applied airtight coating—are becoming essential. These coatings effectively seal the internal face of blockwork, providing an uninterrupted air barrier. Not only does this improve airtightness significantly, but it also offers benefits in terms of ease of application and consistency across the entire surface area. Furthermore, the visual indication provided by such coatings makes it easier to identify any missed spots or potential leaks, simplifying quality control.

The shift is perhaps most pronounced for METSEC construction, widely adopted in commercial and multi-residential buildings. Typically relying heavily on plasterboard lining, METSEC framing now requires rethinking its air barrier strategy entirely. Introducing a new air barrier behind the plasterboard, such as flexible airtight membranes or spray-applied airtight products, will be critical. This additional step in the construction process demands careful coordination and training among installers to avoid damage during subsequent construction activities. Ensuring that membranes or coatings are robust and damage-resistant will become a key focus.

This transition towards deeper, more integrated air barriers does more than simply comply with regulations—it significantly enhances building performance and occupant comfort. Effective air barriers behind plasterboard reduce drafts, improve thermal efficiency, and enhance indoor air quality by preventing uncontrolled air infiltration. This means buildings are not only more energy-efficient but also healthier and more comfortable for occupants, aligning neatly with the UK’s broader sustainability goals.

There is no doubt that the UK’s construction sector faces a steep learning curve. Education and training for tradespeople on new products and techniques will be critical to successful adoption. The Building Performance Hub, among others, is already stepping up, offering specific training programs aimed at equipping the industry with the necessary skills to handle these new airtightness requirements. Practical training ensures that building teams can not only apply these solutions correctly but also understand the reasoning behind these higher standards, fostering a culture of quality and meticulousness.

Ultimately, moving away from relying on plasterboard as the sole air barrier is not merely about meeting regulatory requirements. It represents a broader shift in the UK’s construction culture towards buildings that are inherently more sustainable, resilient, and efficient. As air-tightness standards become more rigorous, the distinctions between weather barriers and air barriers—once considered interchangeable by some—will become clearer and more critical. The new approach demands that we look carefully behind the plasterboard, integrating robust and effective air barriers into every aspect of construction.

As we navigate these changes, collaboration, innovation, and education will be essential. By embracing advanced sealing products and improved installation practices, the UK construction industry will not only achieve compliance but set a global benchmark for air-tightness excellence. This journey from plasterboard reliance to deeper, smarter, and more integrated solutions will define the future of air barrier strategies for years to come.