This website uses cookies to ensure you get the best experience on our website: Find out more.
Make your home or business warmer, more energy-efficient and draught-free with high-performance underfloor insulation installed by trusted experts across Wales.
At Spray Foam Wales, we specialise in applying closed-cell spray foam insulation beneath suspended floors in both domestic and commercial properties. Whether you’re renovating a period home, upgrading a new build or insulating a commercial space, underfloor spray foam offers outstanding thermal performance, air sealing, and long-term energy savings.
Traditional insulation methods like mineral wool or rigid board can leave gaps and degrade over time. In contrast, spray foam expands to form a seamless, airtight barrier under your floorboards – keeping heat in and cold out.
Benefits of underfloor spray foam insulation:
Stops cold draughts coming up through floorboards
Reduces heat loss and improves energy efficiency
Helps lower heating bills
Acts as a vapour barrier to prevent damp
Adds strength to suspended floor structures
Ideal for hard-to-reach or uneven floors
We use ThermoFoam™ closed-cell insulation, BBA-certified and perfect for floor applications.
We insulate all types of floors, including:
Suspended timber floors (typical in older homes)
Commercial office floors with air gaps
Crawl spaces and voids beneath raised floors
Conservatories, extensions and modular buildings
Farmhouses and rural properties with uneven floors
Need spray foam for other areas too? Explore our loft and roof insulation or campervan insulation services
Yes – it’s ideal for use under suspended timber floors. It forms an airtight seal without lifting or removing the floor above.
Absolutely. Spray foam seals gaps and cracks that allow cold air to rise from the void beneath your home.
Yes – we use ThermoFoam™ closed-cell spray foam, which is safe, BBA-approved, and fully cured within hours.
Most installations are completed in 1 day, depending on floor size and access.
No need to lift the floor! We access the underfloor void via crawl space or an access hatch — all we ask is that the area is clear underneath if possible.
We’re happy to advise on the best insulation solution for your floor type and property. Whether it’s a single room or an entire building, we’ll help you stay warm, dry and energy-efficient.
Contact us today or request your free quote below.