Expanding Foam | Expanding Foam Guns | Sealant

At Insulation4Less, we supply a wide selection of expanding foam products designed for professional, industrial, and DIY use. Whether you’re looking for a quick gap filler, adhesive foam, or fire-rated expanding foam, our range helps you seal, insulate, and protect with confidence.

What is Expanding Foam?

Expanding foam is a versatile gap-filling solution that expands on application to fill cavities, seal joints, and improve thermal and acoustic insulation. Perfect for sealing, filling, and repair tasks, it’s widely used in both domestic and industrial projects.

Choosing the right product for the job

For ordinary building gaps and cavities, Everbuild Fix & Fill is a quick-setting polyurethane-based material that expands after dispensing. Its product listing describes use in irregular openings and identifies 500ml and 750ml cans. It can be trimmed once sufficiently cured; the listed guidance says it can be cut, sawn or plastered after approximately one hour, subject to conditions and the product instructions.

For fixing rather than filling, Pinkgrip Dry Fix 750ml is a distinct adhesive product. Pinkgrip cartridge adhesives are also listed, but they use a different application format. Select a compatible adhesive according to the materials being bonded, the loading requirements and the manufacturer’s instructions. Do not assume every filler can replace mechanical fixings.

Where the job involves a fire-resisting construction, the collection includes Fire Foam Hand Grade Aerosol 750ml, Fire Mate Intumescent Sealant 295ml and AC95 Intumescent Acoustic Sealant 900ml. These products have different intended uses. A fire classification or test result for one joint or assembly must not be assumed to apply to every wall, floor or service penetration.

For movement joints and general-purpose sealing, Industrial Puraflex 40 Sealant 300ml and the other listed cartridge sealants may be more appropriate than an expanding aerosol. Review the specified joint width, movement capability, exposure and substrate preparation. Standard filler is not a substitute for a designed damp-proof system, waterproofing coating or structural concrete repair.

Application and preparation

Before applying any aerosol product, read its current technical and safety documentation. Protect adjacent finishes, wear the specified personal protective equipment and ensure suitable ventilation. Prepare surfaces as instructed; excessive dispensing can distort surrounding materials as the product expands. Allow for curing before trimming or decorating and protect cured material from exposure where required by the datasheet.

A hand-held aerosol can is convenient for occasional filling tasks. For projects needing controlled repeated dispensing, check whether a specific product is gun-applied and whether a compatible applicator and cleaner are required; the visible range should not be taken as proof that a separate expanding foam gun is included. For related products, browse the

sealants and adhesives collection or explore fire stopping insulation for wider system components.

Types of Expanding Foam Available

Expanding foam has carved its indispensable niche in the ever-evolving landscape of building and construction. Predominantly, products under our Expanding Foam category can be broadly classified into several key types, focusing on various use-case scenarios and applications in construction, repair, and insulation.

Standard Expanding Foams

Standard expanding foams like Hermetic Foam and Fix & Fill Foam Filler find their utility in general-purpose filling, sealing, and insulating tasks. They’re designed to effectively fill gaps, offering thermal insulation and reducing the ingress of unwanted drafts and pests. These are an excellent choice for DIYers and professionals alike, ensuring easy application and providing a robust seal in varied situations.

Practical Uses: General Insulation and Filling

Examples: Hermetic Foam 750mlv and Fix & Fill Expanding Foam Filler

Intumescent and Fire Retardant Sealants

For projects where fire safety and protection are paramount, our range of intumescent and fire-retardant sealants, like Fire Mate, AC95, and Fire Foam Hand Grade Aerosol, offers peace of mind by providing a fire-resistant seal. These foams expand in the presence of heat, helping to prevent the spread of fire and smoke through openings and gaps, making them a critical choice in environments that necessitate an enhanced fire safety protocol.

Practical Uses: Fire Protection and Safety

Examples:

• Fire Mate Intumescent Sealant - 295ml
• AC95 Intumescent Acoustic Sealant 900ml
• Fire Foam Hand Grade Aerosol 750ml

Heavy Duty and Industrial Sealants

When durability and strength are vital, our heavy-duty sealants like Industrial Puraflex 40 ensure a sturdy, resilient seal in demanding industrial environments. Known for their enhanced adhesion and ability to withstand extreme conditions, these are the preferred choice for applications demanding a robust, long-lasting seal amidst exposure to harsh elements.

Practical Uses: Robust Sealing in Industrial Environments

Examples: Industrial Puraflex 40 Sealant 300ml - Black

Benefits of Expanding Foam Products

• Excellent Gap Filling – Expands to fill gaps, cracks, and awkward spaces with ease.
• Energy Efficiency – Improves insulation by sealing air leaks, helping to reduce energy loss.
• Moisture & Air Tightness – Forms a barrier against draughts and moisture ingress.
• Acoustic & Fire Protection – Certain products offer soundproofing and fire-resistant properties.
• Quick, Easy Application – Available as gun grade expanding foam coatings for professionals or hand-held cans for DIY.

How to Choose the Right Expanding Foam 

• For General Gap Filling: Choose hand-held expanding foam for small gaps and easy DIY applications.
• For Professional Use: Pick gun grade expanding foam with a foam gun for precise, controlled application.
• For Fire Protection: Select fire-rated expanding foam to help block smoke and flames for safety compliance.
• For Bonding Insulation Boards: Go for adhesive foam to securely fix boards without mechanical fasteners.
• For Acoustic Performance: Use acoustic expanding foam to reduce noise transfer through walls and floors.
• For Water and Air Sealing: Pick water-resistant foam that expands to block moisture and draughts effectively.

Applications of Sealing Expanding Foam

• Filling gaps around windows and doors
• Sealing around pipework or wiring penetrations
• Insulating roof voids or cavity walls
• Blocking draughts in lofts, garages, or sheds
• Providing fire-rated protection for service gaps

Importance of Gap Filling with Expanding Foam

• Gap filling improves energy efficiency by sealing gaps and reducing heat loss.
• Gap filling prevents cold draughts for a more comfortable indoor environment.
• Blocks moisture to protect against damp and water damage.
• Reduces noise transfer by sealing gaps in walls and floors.
• Provides fire resistance when using fire-rated expanding foams.
• Delivers a clean, professional finish ready for further work.

Why Buy Expanding Foam from Insulation4Less?

• Trade-Quality Products from trusted brands like Soudal, Everbuild, and Illbruck.
• Competitive Prices with bulk-buy discounts on selected products.
• Fast Nationwide Delivery across the UK.
• Expert customer support to help you choose the right product for your project.

Frequently asked questions

Where should you not use expanding foam?

Do not use ordinary gap filler as a structural repair, a complete damp-proof barrier or an unverified fire-stop. Avoid unsuitable substrates and locations prohibited by the product datasheet, including applications requiring a specific movement joint or tested system.

Can I fill a large hole with it?

It can fill certain irregular openings, but check the manufacturer’s maximum permitted dimensions and application method. Large voids may need backing, staged application or a different repair material.

How long does it take to dry?

Drying and curing vary with the product, temperature, humidity and bead size. Everbuild Fix & Fill is listed as suitable for cutting, sawing or plastering after about one hour; this does not establish full cure for every application.

What surfaces will it not stick to?

Adhesion depends on the formulation and surface condition. Check the specific datasheet and carry out a compatibility test where needed, especially on low-energy plastics, contaminated surfaces and delicate finishes.

Is fire-rated aerosol filler the same as intumescent sealant?

No. Fire Foam Hand Grade Aerosol and the listed Fire Mate or AC95 cartridge sealants are different products. Select according to the tested joint or penetration detail, not simply the presence of the word “fire”.

Can I use it around windows and doors?

Only where the product is suitable for the frame and gap. Control expansion, avoid frame distortion and follow the installation requirements for weather sealing and fire performance where relevant.