10 Best Insulating Foam in The UK

Last updated on 11/08/2025

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Best Choice

9.7

Exceptional

Elito Home & Garden

3 X Expanding Foam PU Bond and Fill Sealing Insulating around Pipes Windows cracks on walls Gap Filler Spray 500ml

Why We Love It

Fills gaps around various surfaces.
Features quick drying, long-lasting filler.
Each bottle filling up to 33 Litres.

Main Highlights

3 X Expanding Foam Pu Bond And Fill Sealing Insulating Around Pipes Windows Cracks On Walls Gap Filler Spray 500Ml
Brand : Elito Home Garden
Product Type : Sealant

Soudal 750ml Champagne Gap Filler Expanding Foam Handheld Spray with Nozzle & Gloves (3)

Why We Love It

Excellent adhesion to substrates.
Easily sanded and painted.
Superb acoustic and thermal insulation.

Main Highlights

Ideal for filling and insulating holes, cavities, gaps and joints in most construction applications.
Excellent adhesion to most common building substrates
An ideal solution for filling gaps, cracks and holes in stone, wood, bricks and most common building materials
This expandable PU foam gap filling has excellent acoustic and thermal insulation properties.

Aluminum Foam sleeping mat for camping 145x195 cm insulating mats thermal Blanket foldable tent mat floor pad of aluminum foil reflect heat, ultralight

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Why We Love It

Lightweight and easy to carry.
Reflects heat for warmth.
Ideal for camping and picnics.

Main Highlights

This waterproof outdoor mat has double sided aluminium foil and inside is made of EPE.
It is used for thermal insulation (reflecting heat), protecting the sleeping bag from cold ground. Ideal as a tent mat.
Our sleeping mat has colour: silver white, matte edges: black and light weight: Approx. 190 g with thickness: Approx. 0.2 cm, length: Approx. 195 cm, width: Approx. 145 cm.
A good ground mat for picnics and sleeping when camping and trekking.
Foldable and easy to carry. Carry pack is included.

B1 Fire Rated Foam Soudal Gun Grade Expanding Insulating PU Foam 750ml

Why We Love It

Fire retardant protection included.
Effective insulation for gaps.
Useful both indoors, outdoors.

Main Highlights

Fire retardant window and door frames
Resist heat, cold, moisture and noise
Fills and insulates gaps and cavities
Can be used indoors and outdoors
Excellent bonding properties

Gorilla Heavy Duty Expanding Foam 353ml - Multi-Purpose, Durable & Seals out Air, Moisture & Pests | No Shrinkage & Maximum Seal | For Indoor & Outdoor* Use

Why We Love It

Secures against air and moisture.
Accessible for numerous applications.
Ensures seamless, durable sealing.

Main Highlights

*For outdoor applications, cured foam must be painted or coated. Exposure to sunlight may cause discolouration.
HEAVY DUTY GAP FILLING: Seal gaps and cracks up to 2.5cm with Gorilla Heavy Duty Expanding Foam. Its multi-purpose formula creates a lasting, heavy-duty seal, effectively keeping out air, moisture, and pests for a reliable solution.
MULTI-PURPOSE: Gorilla Heavy Duty Expanding Foam offers no shrinkage and a maximum seal. The foam becomes tack-free in 8-12 minutes, allowing trimming in 45 minutes. It is also paintable and sandable to adapt to any DIY project.
INDOOR & OUTDOOR USE: Perfect for DIY projects indoors and outdoors. For outdoor applications, ensure the cured foam is painted or coated to prevent potential discoloration caused by sunlight exposure
GAP FILLING: Gorilla Heavy Duty Expanding Foam offers a long-lasting, heavy-duty seal that effortlessly fills the smallest gaps. With zero shrinkage on fixes in attics, plumbing, vents, ceilings, ducts, doors, and windows, providing a seamless finish.
FOR USE ON: Suitable for various materials and applications, including PVC, brick, concrete, insulation materials, plaster, wood, metal, and more. It's also suitable for ducts, doors, windows, and skylights

Haltons Expanding Foam Filler | Ready To Use | No Tools Required | Waterproof Caulk Spray Sealant for Walls, Cracks, Gaps, Holes in Brick, Wood, Metal | Strong & Reliable Repair Indoor & Outdoor (2pk)

3% OffFree Shipping

Why We Love It

Fills large holes effortlessly.
Versatile with multiple uses.
Dries quickly for convenience.

Main Highlights

👍 EXPANDING – Our expanding foam is ideal for filling up large holes or cracks as it rapidly expands to up to many times to original volume
👷 SPRAY NOZZLE – No tools needed. Comes with an attachable nozzle that you can use to squeeze into gaps to fill and seal them tight with utmost ease!
🪟 MULTI-SURFACE – An ideal solution to plug large cracks and holes in stone, wood, brick and metal and ceramic, this is a perfect all rounder
💪 VERSATILE – Use this expanding caulk for waterproofing, sound proofing, insulation and more. It’s a very useful household tool allowing you to seal gaps in your bathroom, for your windows, pipes and plumbing
🚀 QUICK DRY – Only takes about an hour to fully dry out, allowing you time to adjust or remove, whilst also not taking too long of a wait. This can also be painted, sanded down, cut or sawn once dry

FERRIS | The Original Gorilla Filler [2 x 500ml] Weatherproof Expanding Foam Filler | Securely Seals & Fills, Squeezes into Gaps | Suitable for Filling, Sealing Gaps & Cavities

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Why We Love It

Versatile theme for all spaces.
Promotes energy-efficient environments.
Long-lasting, hassle-free application.

Main Highlights

The Original Gorilla Filler is the ideal solution to large cracks and holes in stone, wood, brick and metal. It expands on contact to fill any shaped gap and hardens to form an airtight weatherproof seal. Can be cut, sawn, painted or sanded.
𝗨𝗟𝗧𝗜𝗠𝗔𝗧𝗘 𝗩𝗘𝗥𝗦𝗔𝗧𝗜𝗟𝗜𝗧𝗬 : Expanding foam filler is a must-have product for every DIY enthusiast and construction professional. Its unique ability to expand and conform to any space makes it the perfect solution for sealing gaps, cracks, and voids in homes, offices, and buildings of all sizes. From insulating walls and windows to sealing plumbing and electrical installations, this product does it all.
𝗘𝗡𝗘𝗥𝗚𝗬 𝗘𝗙𝗙𝗜𝗖𝗜𝗘𝗡𝗖𝗬 𝗖𝗛𝗔𝗠𝗣𝗜𝗢𝗡 : Save on energy bills and create a comfortable environment with our expanding foam filler. By creating an airtight seal, it effectively prevents drafts and heat loss, helping to maintain a consistent indoor temperature. Whether it's summer or winter, our foam ensures your space remains cozy and energy-efficient, making it an eco-friendly choice.
𝗛𝗔𝗦𝗦𝗟𝗘-𝗙𝗥𝗘𝗘 𝗔𝗣𝗣𝗟𝗜𝗖𝗔𝗧𝗜𝗢𝗡 : Our expanding foam filler is designed for easy and convenient application. With its user-friendly cans or kits, you can quickly seal gaps and cracks without any mess or complicated procedures. Just follow the instructions, and the foam will expand and do the work for you, providing a professional-grade seal without any hassle.
𝗗𝗨𝗥𝗔𝗕𝗟𝗘 𝗔𝗡𝗗 𝗟𝗢𝗡𝗚-𝗟𝗔𝗦𝗧𝗜𝗡𝗚 : Our expanding foam filler not only provides immediate results but also offers long-lasting performance. Once cured, it becomes a sturdy and resilient barrier, resistant to water, weather, and pests. Its durability ensures that your investment in insulation and sealing will pay off for years to come, providing peace of mind and cost-effectiveness.

UniBond White Teq Expanding Foam, Superior Insulation, Fills and Seals, Ideal for Big Gaps and Holes, for Indoor and Outdoor Use, Thermal Insulation, Guaranteed Noise Reduction, Straw PU Foam 1x750ml

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Why We Love It

Moisture and draft protection.
Durable, high-quality formula.
Versatile for all applications.

Main Highlights

Moisture & Draft Protection: Effectively insulates against Moisture and unwanted drafts, creating a more comfortable environment
Durable & Professional Quality: Designed for long-lasting performance with a high-quality formula that ensures easy and efficient application
Versatile Indoor & Outdoor Use: Suitable for both interior and exterior applications, providing reliable insulation in various conditions
Superior Noise Reduction: Enhances acoustic insulation by over 50 percent, significantly minimizing sound transmission for a quieter space
Efficient Thermal Insulation: Maintains optimal temperature control, performing effectively in extreme conditions ranging from -5°C to -35°C

5M Pack 22mm pipe x 9mm thick Foam Pipe Insulation Lagging Wrap Roll

Why We Love It

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Main Highlights

1m lengths
Genuine New Climaflex Branded closed-cell Polyethylene Pipe Insulation for pipes.
Slit down one side for ease of putting on, highly flexible, dust free, easy install
Non absorbent by water - ok for outdoor usage
CFC and HCFC free (ozone depletion potential of zero)

2 x Cans Of The Original Gorilla Filler Weatherproof expanding foam 500ml Each

5% Off

Why We Love It

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Main Highlights

2 X Cans Of The Original Gorilla Filler Weatherproof Expanding Foam 500Ml Each
2 x Cans Of The Original Gorilla Filler Weatherproof expanding foam 500ml Each
Color: Stone
Stone
500ml

8.7

Excellent

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We scanned 898 products

We reviewed these offers relevant to the Insulating Foam within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Elito Home & Garden, Soudal, OJAYERR, Truly PVC Supplies, Gorilla, Haltons, FERRIS, Unibond, Climaflex, JKG Unknown, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Insulating Foam in the market, we considered we took a deep dive into 4491 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is 3 X Expanding Foam PU Bond and Fill Sealing Insulating around Pipes Windows cracks on walls Gap Filler Spray 500ml. We love many things about this product by Elito Home & Garden. What sets it apart from the competition is Fills gaps around various surfaces. , Features quick drying, long-lasting filler. , Each bottle filling up to 33 Litres.
The best value product for most shoppers and where user satisfaction is continuously the highest is Soudal 750ml Champagne Gap Filler Expanding Foam Handheld Spray with Nozzle & Gloves (3) by Soudal based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Insulating Foam and the best cost-to-value ratio is 2 x Cans Of The Original Gorilla Filler Weatherproof expanding foam 500ml Eachat JKG Unknown with a 5% discount.
Our list of the best Insulating Foam is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Insulating Foam in The UK

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We scanned 898 products

We concluded that: