Spray Foam: Top 5 Options in the UK for 2026
Published on Tuesday, 27 January 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.
Top Picks Summary
Everbuild 750ml Gap Foam Filler
Everbuild's 750ml Gap Foam Filler is positioned as a best-in-class option for spray foam tasks thanks to its large can size and strong price-to-volume value, making it attractive for tradespeople who need high yield. Compared with the other products listed, it emphasizes cost-efficiency and broad availability in the UK market while delivering reliable adhesion and thermal sealing performance for general gap-filling work.
UniBond Expanding Foam Filler
UniBond Expanding Foam Filler is a user-focused foam designed for easy indoor use, low odour and consumer-friendly application, which helps it stand out among DIY-oriented buyers. Relative to the more professional-grade alternatives here, UniBond balances safety, convenience and competitive pricing for household sealing tasks, though it may offer slightly less yield or industrial robustness than specialist trade-brand foams.
Gorilla Expanding Foam
Gorilla Expanding Foam leverages the brand's reputation for durable adhesives to offer a tough, high-adhesion foam that performs well in structural sealing and repair jobs, making it a market leader for demanding DIY and light professional use. Compared with euro-centric brands on the list, Gorilla often commands a premium but delivers consistent tack, good cell structure and wide retail availability in North America, which can justify the higher unit cost for users prioritizing strength and brand reliability.
Soudal Gap Filling Foam
Soudal Gap Filling Foam is a trade-oriented product from a leading European sealants manufacturer, prized for its consistent expansion, temperature resilience and suitability across insulation and acoustic sealing applications. In comparison to the more consumer-targeted foams above, Soudal offers technical refinements and professional formulations that often yield better thermal and acoustic performance per can, making it a preferred choice for contractors focused on long-term building performance.
Fischer PU Foam
Fischer PU Foam represents the market-leader technical option by pairing polyurethane foam with Fischer's precision delivery and system compatibility, offering predictable density, controlled expansion and options tailored for fixing and insulation systems. Versus the other products listed, Fischer often commands higher unit prices but provides measurable installation advantages for installers who need reproducible results, compatibility with fixings and access to certified system components.
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
What is the best spray foam in UK in 2026?
As of June 2026, Everbuild 750ml Gap Foam Filler is the top choice for spray foam in UK. Everbuild's 750ml Gap Foam Filler is positioned as a best-in-class option for spray foam tasks thanks to its large can size and strong price-to-volume value, making it attractive for tradespeople who need high yield. Compared with the other products listed, it emphasizes cost-efficiency and broad availability in the UK market while delivering reliable adhesion and thermal sealing performance for general gap-filling work.
What are the key features of Everbuild 750ml Gap Foam Filler?
Everbuild 750ml Gap Foam Filler features: 750ml polyurethane expanding foam formulated for filling gaps and joints, Good adhesion to brick, concrete, wood and metal for reliable sealing, Fast curing, paintable and provides thermal and acoustic insulation.
What are the benefits of Everbuild 750ml Gap Foam Filler?
The main benefits include: Fast curing (blink-fast), High adhesion (holds tight), Precision nozzle (target shots).
How does Everbuild 750ml Gap Foam Filler compare to UniBond Expanding Foam Filler?
Based on June 2026 data, Everbuild 750ml Gap Foam Filler is rated 4.5/5 while UniBond Expanding Foam Filler is rated 4.2/5. Both are excellent choices, but Everbuild 750ml Gap Foam Filler stands out for 750ml polyurethane expanding foam formulated for filling gaps and joints.
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.