Gorilla Heavy-Duty Expanding Foam 353ml is a fast-curing, multi-purpose expanding foam designed to fill, seal and insulate gaps, cracks and openings around the home, workshop or building project.

Ideal for renovation, construction, maintenance and DIY work, the expanding formula fills difficult spaces to help block air, moisture and small pests, creating an effective barrier around suitable openings.

The supplied precision straw applicator provides controlled application, helping direct the foam exactly where it is required while minimising unnecessary overflow and mess. This makes it easier to achieve a neat, professional-looking result, even in awkward or hard-to-reach gaps.

Gorilla Heavy-Duty Expanding Foam bonds to a broad range of compatible building materials, including PVC, brick, concrete, plaster, wood, metal, plastic and insulation, making it an extremely versatile gap-filling product for professional and household use.

Suitable applications include areas around windows, doors, walls, attics, basements, crawlspaces, vents, skylights, plumbing and masonry.

For anyone searching for Gorilla expanding foam, expanding foam filler, gap filling foam, insulation foam, expanding foam for windows and doors, weatherproof expanding foam or builders foam, Gorilla Heavy-Duty Expanding Foam provides controlled application and powerful gap-filling performance.

Key Benefits

• Heavy-duty Gorilla expanding foam

• 353ml can

• Fast-curing formula

• Fills gaps and cracks

• Seals openings

• Provides insulation

• Helps block unwanted airflow

• Helps block moisture

• Helps prevent entry by small pests

• Precision straw applicator

• Controlled foam application

• Helps minimise unnecessary overflow

• Ideal for difficult-to-reach gaps

• Suitable for windows and doors

• Suitable for walls

• Ideal for attics and basements

• Suitable for crawlspaces

• Useful around plumbing

• Suitable for masonry

• Bonds to multiple building materials

• Ideal for professional and DIY use

Expanding Foam for Gaps & Cracks

Gorilla Heavy-Duty Expanding Foam is designed to expand into gaps, cracks and irregular openings, filling spaces that may be difficult to seal using conventional rigid materials.

As the foam expands, it conforms to the surrounding area, helping create a continuous fill within the opening.

This makes it particularly useful for:

• Gaps around building components

• Cracks and openings

• Irregular voids

• Hard-to-reach spaces

• Areas requiring additional sealing

• General building and renovation work

Fill, Seal & Insulate

One product provides three important functions: filling, sealing and insulating.

The expanding foam fills empty spaces while helping seal openings against unwanted airflow and moisture.

By filling gaps around compatible building materials, it can also help improve insulation in suitable applications.

Fast-Curing Formula

Gorilla Heavy-Duty Expanding Foam features a fast-curing formula, helping projects progress efficiently.

The foam expands after application to fill the available space before curing into a durable material.

Expansion and curing performance can vary according to temperature, humidity, gap dimensions and application conditions, so always follow Gorilla's instructions.

Precision Straw Applicator

Expanding foam can be difficult to control if too much product is released into a small gap.

Gorilla Heavy-Duty Expanding Foam includes a precision straw applicator designed to provide greater control over foam placement and expansion.

The applicator helps:

• Direct foam into narrow gaps

• Reach awkward areas

• Improve application accuracy

• Reduce unnecessary overflow

• Minimise waste

• Produce a neater finished result

Helps Block Air

Small gaps around building components can allow unwanted air movement.

By expanding into suitable cracks and openings, Gorilla Heavy-Duty Expanding Foam helps seal against unwanted airflow, making it useful around windows, doors and other compatible building elements.

Helps Block Moisture

The foam is designed to help seal out moisture in suitable applications.

This makes it useful for many building and maintenance projects where gaps need to be filled and protected from environmental exposure.

For continuously submerged, pressurised-water or specialist waterproofing applications, use a system specifically approved for that purpose.

Helps Block Small Pests

Open gaps and cracks can provide entry points for insects and other small pests.

Gorilla Heavy-Duty Expanding Foam helps fill and close suitable openings, reducing potential access through gaps around building components.

Expanding foam should not be treated as a substitute for specialist pest-control measures where an active infestation or structural entry problem exists.

Expanding Foam for Windows & Doors

Gaps around window and door installations are a common application for expanding foam.

The controlled applicator allows foam to be directed into appropriate spaces around frames, helping fill and seal irregular gaps.

Care should always be taken to use the appropriate quantity and follow Gorilla's instructions, particularly around components that could be affected by excessive expansion pressure.

Ideal for Attics & Basements

Attics and basements frequently contain gaps around building materials, pipes, vents and other penetrations.

Gorilla Heavy-Duty Expanding Foam can be used to fill compatible openings, helping create a more complete barrier against unwanted air movement and moisture.

Suitable for Walls & Crawlspaces

The expanding formula is useful for filling suitable openings in walls and crawlspaces, particularly where access is limited or the gap has an irregular shape.

The precision straw helps reach into spaces that may be difficult to fill with conventional materials.

Expanding Foam Around Plumbing

Openings around pipes and other plumbing penetrations can leave unwanted gaps through walls and building materials.

Gorilla Heavy-Duty Expanding Foam can be used to fill appropriate spaces around compatible plumbing installations.

Always maintain required clearances from heat-producing equipment and follow relevant building, fire and plumbing requirements.

Suitable for Vents & Skylights

The product can also be useful around suitable vents and skylight installations, where irregular openings may need to be filled.

It should not obstruct required ventilation paths, drainage routes or moving components.

Bonds to Multiple Materials

Gorilla Heavy-Duty Expanding Foam adheres to a wide range of common building materials, including compatible:

• PVC

• Brick

• Concrete

• Plaster

• Wood

• Metal

• Plastic

• Insulation

• Masonry

• Other suitable construction materials

Always check compatibility with specialist plastics, coatings and delicate surfaces before application.

Expanding Foam for Brick & Concrete

The foam's ability to bond with brick, concrete and masonry makes it particularly useful for building and renovation projects.

It can fill irregular spaces that would otherwise be difficult to seal neatly using conventional fillers.

Expanding Foam for Wood

Gorilla Heavy-Duty Expanding Foam bonds to wood, making it useful around timber framing, wooden building components and other compatible construction applications.

Expanding Foam for PVC & Plastic

The product can adhere to compatible PVC and plastic materials, increasing its usefulness around various building components.

Because plastic formulations vary considerably, material compatibility should be checked before important applications.

Professional & DIY Applications

The combination of controlled dispensing, fast curing and multi-material adhesion makes Gorilla Heavy-Duty Expanding Foam useful for both tradespeople and DIY users.

Potential applications include:

• Building projects

• Home renovation

• Property maintenance

• Window installation

• Door installation

• Loft and attic work

• Basement projects

• Plumbing penetrations

• Masonry repairs

• Wall openings

• General gap filling

How to Use

• Identify the gap, crack or opening that requires filling.

• Check that the surrounding materials are compatible with Gorilla Heavy-Duty Expanding Foam.

• Ensure the application is suitable for expanding foam.

• Prepare and clean the area according to Gorilla's instructions.

• Protect surrounding surfaces from unwanted foam.

• Attach or prepare the precision straw applicator as directed.

• Apply the foam carefully into the required area.

• Allow room for the foam to expand rather than completely overfilling the gap during initial application.

• Avoid disturbing the foam while it expands and cures.

• Allow it to cure fully before trimming, finishing or placing the area into service.

• Do not obstruct ventilation, drainage or other required openings.

• Observe appropriate clearances around electrical, heating and plumbing equipment.

• Wear the personal protective equipment specified by the manufacturer.

• Always follow Gorilla's complete application and safety instructions.

Ideal For

• Gaps

• Cracks

• Voids

• Windows

• Doors

• Walls

• Attics

• Basements

• Crawlspaces

• Plumbing penetrations

• Vents

• Skylights

• Brick

• Concrete

• Masonry

• Plaster

• Wood

• Metal

• Compatible plastics

• PVC

• Insulation

• Building projects

• Renovations

• DIY repairs

Product Information

Brand: Gorilla
Product: Heavy-Duty Expanding Foam
Size: 353ml
Type: Multi-purpose expanding gap-filling foam
Fast Curing: Yes
Gap Filling: Yes
Sealing: Yes
Insulating: Yes
Precision Applicator: Yes
Applicator Type: Straw
Helps Block Air: Yes
Helps Block Moisture: Yes
Helps Block Small Pests: Yes
Bonds PVC: Yes, where compatible
Bonds Brick: Yes
Bonds Concrete: Yes
Bonds Plaster: Yes
Bonds Wood: Yes
Bonds Metal: Yes
Bonds Compatible Plastic: Yes
Bonds Insulation: Yes
Suitable for Windows & Doors: Yes
Suitable for Building & Renovation Projects: Yes
Primary Use: Filling, sealing and insulating compatible gaps, cracks and openings in building, renovation and DIY applications

WEEE Recycling Producer Registration Number:12889

How do I return my old product to be recycled?

You can return your old product to MyDIY. Waste Electrical and Electronic Equipment (WEEE) is taken back free of charge on a one-for-one, like-for-like basis. Waste batteries including rechargeable batteries are taken back free of charge. You are not obliged to make any purchase when returning old batteries. Each local authority must also accept household WEEE and small batteries free of charge at its recycling facilities. All WEEE and waste batteries must be recycled and should not be placed in any of your household wheelie bins. Make sure you always recycle all your old electrical goods and batteries.

What products can I recycle for free?

You can return anything that is electricaly powered or battery powered. Even your old bicycle lamps can be recycled!.

Do you take back used batteries?

Yes we do. The batteries that we accept are AA, AAA, C or D, powertool batterys and also the flat batteries that are found in watches and toys. Unfortunately we do not accept back any Industrial or car batteries.

Do I need to have made a purchase at MyDIY.ie?

No you don't. You can recycle any of the above items at our store in Inchicore Dublin 8, even if you have not made a purchase with us.

Will you collect my old product?

Yes, but we must be notafied within 14 days of purchase date. You can still arrange to have your old appliance recycled free of charge. Simply bring it back to our Inchicore store and we will ensure that it is disposed of in an environmentally friendly manner.

How much will it cost?

There is no charge to return products to any of our warehouses.

Why should I recycle with MyDIY?

We will ensure that your old product is disposed of correctly to reduce the potentially harmful effects caused on the environment and to conserve natural resources. Further information can be found on weeeireland.ie.

EMC (Environmental Management Cost) Included in the purchase price. 

Gas discharge lamps, LFLs and CFLs €0.15

LED lamps and luminaires €0.05

Large appliances €5.00

Information

Fast & Reliable Shipping with DPD

We ship all orders via DPD, one of Ireland’s most trusted couriers. With DPD’s one-hour delivery window, you won’t have to wait around all day for your MyDIY.ie order!

Delivery Times

Each product on our website is marked with an estimated delivery time. If you order multiple items, your order will arrive based on the item with the longest delivery time. For example, if you buy two next-day items and one 3-day item, the entire order will arrive in 3 days.

While most products arrive in 1-2 days, we offer over 44,000 items, so please allow 4-5 working days for some deliveries. Need it faster? Call us at 01-446692, and we'll do our best to help.

Delivery Charges

• FREE delivery for orders over €150 within Ireland.

• Orders under €150: €8.99 delivery fee.

• International delivery: Charges based on weight—contact us for a quote.

When Will I Receive My Order?

• Most orders ship on a 24-hour courier service (2 working days).

• Larger orders may take 4-5 days, and pallet deliveries require scheduling.

• Orders placed before 2 PM usually ship within 24 hours.

• Orders after 1:30 PM Friday or on weekends ship the following week.

• Busy holiday periods may cause slight delays beyond our control.

Do I Need to Be Home for Delivery?

Yes, someone must sign for deliveries due to item value. If you're not home, DPD will leave a card with re-delivery or collection instructions. After two failed attempts, your order may be returned to us, and a re-delivery fee may apply.

Damaged or Incomplete Orders

We carefully pack all orders, but if something arrives damaged or incomplete, contact us within 24 hours. Report shortages within 3 days of delivery.

International Shipping

We ship to Europe and worldwide, with charges based on weight. Liquid products cannot be shipped internationally due to regulations. Contact us for a quote—we're happy to help!

Customer Service & Returns