Spray Foam: Top 5 Options in the UK for 2026
Spray foam is a high-performance insulation and air-sealing system commonly used in lofts, walls, rafters and around service penetrations to reduce heat loss and improve airtightness. In the UK market it is popular with homeowners and installers aiming to cut energy bills, meet retrofit standards and upgrade older fabric performance without large structural changes. Consumers choose spray foam for its fast installation, strong thermal performance, and ability to fill irregular cavities. Preference trends in 2026 focus on certified installers, low global warming potential (GWP) blowing agents, and compliance with PAS 2035 retrofit guidance and Building Regulations. Note: this page currently lists the top 0 spray foam options for the UK in 2026 because a ranked product dataset was not provided. Use the search and filters to locate specific products, supplier details and installer accreditation.
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Top Picks Summary
What the Research Says about Spray Foam
Scientific literature and independent testing indicate that spray foam can significantly improve U-values and reduce uncontrolled air leakage when applied correctly. Research from building science organisations and university studies highlights strong thermal and acoustic benefits, but also emphasises the importance of correct specification, installation and moisture risk management. Findings have informed UK guidance on retrofit and new build practice, and have driven market shifts toward lower GWP blowing agents and accredited installers.
Energy performance: Research and case studies show measurable reductions in heat loss and energy demand after spray foam installation, with typical savings depending on building type and scope of works.
Airtightness: Spray foam acts as an effective air barrier where continuous installation is achieved, helping reduce drafts and heat loss from leakage paths.
Moisture and condensation: Studies warn that improper use can create interstitial condensation risks, especially in solid wall retrofits, so hygrothermal analysis and ventilation planning are essential.
Material types: Open cell and closed cell foams perform differently; closed cell provides higher insulation value and vapour resistance, while open cell offers greater breathability and cost benefits in some applications.
Environmental impact: Research and regulatory guidance have pushed adoption of low GWP blowing agents such as HFOs; lifecycle assessments consider embodied emissions, GWP of blowing agents and long-term energy savings.
Installation quality: Evidence repeatedly shows that installer training, accredited systems and on-site quality control are the deciding factors for long-term performance and safety.
Regulatory context: Guidance from bodies such as the Building Research Establishment and alignment with PAS 2035 retrofit standards inform specification and compliance choices.
Frequently Asked Questions
Which spray foam is best for tradespeople needing high yield?
The Everbuild 750ml Gap Foam Filler is the ideal choice for tradespeople because its large 750ml can size provides high volume and excellent value for frequent, large-scale sealing tasks.
What is the average customer rating for Gorilla Expanding Foam?
Gorilla Expanding Foam holds an average rating of 4.6, reflecting its reputation for providing a rigid, durable finish suitable for both gap filling and light structural bonding.
Is UniBond Expanding Foam Filler suitable for indoor DIY projects?
UniBond Expanding Foam Filler is specifically designed for indoor DIY use, featuring a low-odour formula and user-friendly application options that allow it to be easily trimmed, sanded, and painted once cured.
Does Everbuild 750ml Gap Foam Filler stick to metal surfaces?
Everbuild 750ml Gap Foam Filler provides reliable adhesion to metal, as well as brick, concrete, and wood, making it a versatile solution for sealing various joints and gaps around the home.
Conclusion
Spray foam remains a powerful option for UK insulation and retrofit projects when specified and installed correctly. We hope this summary helped you understand the category and what to look for. If you did not find a ranked product here, refine or expand your search to locate specific manufacturers, low GWP formulations, certified installers and product datasheets.