Which is the Best Expanding Foam to Buy in 2024?

Last updated: January 25, 2024

Whether you’re a seasoned professional or a dedicated DIY enthusiast, the successful completion of any project hinges on your available resources. Whether you boast top-notch skills, employ cutting-edge power tools, or utilize high-quality raw materials, each component significantly influences the ultimate success of your project goals.

When we focus on the final stages of a construction, renovation, or DIY project, safeguarding your work against the forces of nature and unforeseen accidents emerges as a crucial consideration.

Imagine sitting on your couch, hearing the wind whistle through the walls or spotting a sneeze-inducing draft. These issues often stem from the use of inadequate sealants for doors, glazing, or walls.

Investing in the best expanding foam insulation can work wonders for your home, regardless of the prevailing weather conditions. Not only does it fortify your home against chilly winds, but it also contributes to maintaining stable heating levels, ultimately reducing your energy consumption.

Whether your goal is to insulate your home, block out drafts, or minimize sound, expanding foam is one of the most effective long-term solutions. It not only keeps you cosy during winter nights but also provides protection against water and fire hazards.

What is Insulation Foam?

Insulation foam, as the name suggests, is a liquid-based foam commonly available in spray form, facilitating application for insulating layers, filling gaps, and more. Its versatility extends to a wide array of insulation applications, covering roofs, lofts, floors, doors—essentially every type of insulation. In contrast to traditional insulation materials like mineral or glass wool and polystyrene panels, its liquid nature enables it to fill even the smallest gaps, ensuring highly effective sealing against water or wind.

With the countless types and brands of window sealants, expanding foams, and fillers on the market, selecting the best expandable foam for your specific needs can be a formidable task. When making choices about which fillers and insulation foams to purchase, there’s a list of factors to take into account:

Navigating these considerations will guide you toward the most suitable products for your requirements. Of course, we stand ready to be your trusted supplier in meeting these needs.

Illbruck Expanding Foams

Based on your needs, one of the best expanding foam and sealant manufacturers is Illbruck. They offer complete insulation solutions to all your construction and DIY needs. Their products are used in over 90 countries across various sectors.

Illbruck foam kit

Illbruck FM365 Max Foam

Whether you’re a seasoned professional searching for the optimal spray insulation for your project or a DIY enthusiast, whether experienced or not, applying expanding foam is a remarkably straightforward process. For versatile use, covering everything from gap filling to insulation application and bonding, one of the top choices in expanding foam is Illbruck’s FM365.

The FM365 Max Foam stands out as a rapid-curing, high-yield gun-grade foam. Tack-free in under 8 minutes, it’s ready for cutting or trimming in less than 45 minutes. Its excellent adhesion to various materials, including timber, concrete, stone, cement, PVC, and fiberboard, makes it the ideal foam sealant for numerous applications. Trust in FM365 for a seamless blend of efficiency and performance.

Illbruck FM365
Illbruck FM365 B3 Expanding Foam Max Yield

Illbruck FM310 Pro Gun Foam

Additionally, in a similar vein and suitable for a wide range of applications, the Illbruck FM310 stands out as one of the most sought-after expanding foam sealants. Perfect for window or door sealing, as well as around panels and beyond, it proves its versatility in various settings. Its effectiveness is evident in forming a robust, resilient bond with materials such as PVC, polystyrene, concrete, timber, plaster, and fibre cement board. Notably, it allows for easy cutting or trimming within just 60 minutes of application.

What sets this Foaming Spray apart is its low expansion when dispensed, providing users with complete control, enhancing precision, and minimizing wastage. Trust in the reliability of Illbruck FM310 for sealing solutions that balance effectiveness with user-friendly features.

Illbruck FM310 pro foam
Illbruck FM310 Pro Gun Foam

FM330 Pro Foam Air Seal

Without a doubt, when it comes to securing the most effective airtight air filler, the FM330 Pro Foam Air Seal stands out as the ideal choice for insulating general construction joints. Whether you’re sealing the floor-to-wall, wall-to-ceiling joint, addressing pipe and service penetrations, or focusing on windows and doors, this Illbruck foam is your key to achieving an A-rated installation. Once dried, this insulating foam spray boasts up to 35% elasticity, delivering exceptional acoustic and airtight performance.

Rest assured, this foam ensures impeccable insulation, maintaining a secure seal even in the face of any movement or settlement in the joint. Count on the FM330 Pro Foam Air Seal from Illbruck for a perfect blend of effectiveness and reliability in your insulation endeavours.

Illbruck FM330 pro foam
llbruck FM330 Pro Foam Air Seal

See in action!


How long does it take for expanding foam to dry?

The drying time for expanding foam depends on the specific product and environmental conditions. Generally, expanding foam becomes tack-free within a few minutes of application. However, complete curing may take up to 24 hours or more, depending on factors such as humidity, temperature, and the thickness of the foam layer. It’s advisable to refer to the product’s instructions for the manufacturer’s recommended drying and curing times.

Can expanding foam be painted over?

Yes, many types of expanding foam can be painted over once they have fully cured. It’s important to wait until the foam is completely dry and cured before painting it. Additionally, using paints that are compatible with the foam material will help ensure a successful and lasting paint finish.

Can expanding foam be used for soundproofing?

Expanding foam can contribute to soundproofing efforts by filling gaps and cracks, reducing the passage of air and sound vibrations. While it provides some level of acoustic insulation, specialized soundproofing materials may be more effective for comprehensive soundproofing projects. Care should be taken not to overuse expanding foam, as excessive application may compromise its soundproofing benefits.

Can I use expanding foam around electrical wiring?

It is generally not recommended to use expanding foam directly around electrical wiring unless the foam is specifically labelled as safe for such applications. Certain expanding foams may contain chemicals that could potentially damage or interact with electrical components. Always adhere to electrical code regulations and consult the product’s instructions and safety guidelines before expanding foam near electrical wiring.

If you have any additional queries, please do not hesitate to contact us at 01358 726719 or by email at