Soudal Expanding Foam Gun Grade – Professional PU Foam for Gap Filling, Insulating & Fixing

Soudal Expanding Foam Gun Grade is a professional, one‑component polyurethane (PU) expanding foam
designed for use with an application gun. It provides high‑yield, controlled expansion for
filling, sealing and insulating gaps and joints around windows, doors, service penetrations,
roof and wall elements. Ideal for trade use on site where precision, speed and minimal waste are essential.

Soudal Expanding Foam Gun Grade is a one‑component, moisture‑curing polyurethane foam
supplied in a pressurised aerosol can for use with a professional foam gun. On extrusion, the foam
expands and cures by reaction with atmospheric moisture to form a rigid, closed‑cell structure
with excellent insulating, filling and bonding properties. This innovative foam solution caters to those who rely on durability and efficiency in their projects. With adhesive solutions for every tradesperson, it provides the versatility needed for various applications, from insulation to filling gaps. Whether you are a seasoned contractor or a DIY enthusiast, you can trust this foam to deliver exceptional results every time.

Gun‑grade foams are preferred by professionals because they provide better dosing control,
higher yield and cleaner working than hand‑held straw foams. Soudal Expanding Foam Gun Grade is
ideal for filling gaps around window and door frames, sealing service penetrations, insulating
around pipework and between studs, joists and rafters in timber‑frame and masonry construction. In addition to its versatility, Soudal firerated expanding foam benefits from exceptional thermal insulation properties, making it an excellent choice for energy efficiency. Its fire-resistant formulation ensures that it not only fills gaps effectively but also enhances safety in any construction project. With these advantages, professionals can confidently use Soudal foams in both new builds and renovations.

Once fully cured, the foam can be cut, trimmed, sanded, plastered and painted as required.
It offers good thermal insulation (λ‑value typical of PU foams) and sound reduction
in filled cavities. For specific fire or acoustic rated applications, use the appropriate fire‑rated
or acoustic foam variant from the Soudal range and follow system approvals. soudal fire foam b1 advantages include its superior fire resistance and ease of application, making it ideal for a wide range of construction projects. Furthermore, this product provides excellent adhesion to various substrates, ensuring a reliable seal in critical areas. Its application can significantly enhance the overall safety and energy efficiency of buildings.

Typical Use Cases

• Window and door installation – filling and insulating gaps between frames and masonry / timber reveals.
• Timber frame and roof construction – sealing joints and cavities between C16/C24 studs, joists and rafters (non‑structural infill).
• Service penetrations – sealing around pipes, conduits, cables and ductwork passing through walls, floors and ceilings.
• Filling gaps and voids – around lintels, sills, cavity closers, wall plates and prefabricated elements.
• Thermal and acoustic improvement – reducing drafts and noise through cracks, gaps and junctions in the building envelope.

Usage & Application Tips

• Surface preparation:
  • Substrates should be sound, clean and free from loose dust, grease and release agents.
  • Lightly mist very dry, porous surfaces with clean water to improve adhesion and curing (do not soak).
  • Protect surrounding areas (frames, sills, floors, finishes) with masking tape and dust sheets – uncured foam is very sticky.
• Can & gun preparation:
  • Bring the can to room temperature where possible for optimum yield.
  • Shake vigorously (at least 20–30 times) before use and periodically during work.
  • Fix the can onto a suitable PU foam gun following the gun manufacturer’s instructions; adjust flow screw for desired output.
• Application technique:
  • Hold the gun with the can upside down; apply foam by gently squeezing the trigger.
  • Fill cavities to about 2⁄3 full – foam will expand to fill the remaining space.
  • For deep voids, apply in layers, allowing each layer to expand slightly before applying the next.
  • Avoid overfilling around window and door frames to prevent excessive pressure and distortion – use packers and fixings as per industry guidance.
• Curing & finishing:
  • Foam will typically be tack‑free within minutes and can usually be cut back after 30–60 minutes (exact times depend on temperature, humidity and product variant – see datasheet).
  • Once cured, trim excess with a sharp knife or saw; surface can then be sanded, plastered or painted.
  • Protect cured foam from direct UV exposure (sunlight) by covering with render, paint, sealant or other finishes.
• Gun & site clean‑up:
  • Remove uncured foam immediately with a suitable PU foam cleaner or solvent as recommended by Soudal.
  • Cured foam can only be removed mechanically (cutting, scraping).
  • To maintain the gun, either leave a part‑used can fitted (following Soudal guidance) or flush with gun cleaner after use.
• Safety & good practice:
  • PU foams contain isocyanates – always use in a well‑ventilated area and wear suitable PPE (gloves, eye protection, and respiratory protection if required).
  • Do not use near open flames, ignition sources or hot work; contents are under pressure and flammable until cured.

Technical & Performance Overview

Soudal Expanding Foam Gun Grade is a professional insulating and filling foam that is
typically tested against relevant EN standards for construction foams (e.g. EN 17333 for
one‑component foams) and Soudal’s internal quality criteria. Always refer to the latest
technical datasheet and Safety Data Sheet (SDS) for exact values, classifications and approvals. Soudal Swipex heavyduty cleaning solutions are engineered for tough cleaning tasks, providing effective results in various applications. Whether you are dealing with stubborn grease, oil, or grime, these solutions are designed to meet the demands of industrial and professional environments. Trust in Soudal’s expertise to deliver high-quality cleaning products that consistently perform to your expectations.

• Type: One‑component, moisture‑curing polyurethane expanding foam (gun‑grade).
• Application: For use with professional foam guns; not a hand‑held straw foam.
• Expansion: Medium to high expansion; designed for controlled filling of gaps and cavities (exact expansion factor – see datasheet).
• Yield: High yield per can, depending on joint dimensions and application conditions.
• Cell structure: Predominantly closed‑cell for good thermal and acoustic performance.
• Thermal conductivity (λ): Typical PU foam λ‑values around 0.034–0.040 W/m·K (confirm actual tested value on datasheet).
• Sound insulation: Contributes to sound reduction in properly designed and filled joints/cavities (see datasheet for any specific dB ratings).
• Service temperature (cured): Approx. ‑40 °C to +90 °C (short‑term higher peaks possible – check current data).
• Fire behaviour: Standard gun foam is typically a general purpose (e.g. B3) product unless otherwise stated; for fire‑rated requirements use certified fire foam with documented EN tests (e.g. EN 1366).
• Substrates: Concrete, brick, blockwork, stone, plaster, timber (including structural C16/C24), many metals and some plastics. Always test on sensitive plastics and coated surfaces.
• Moisture sensitivity: Cures by moisture – higher humidity and lightly damp surfaces can accelerate curing, very dry conditions may slow it.
• Storage: Store cans upright in a cool, dry, well‑ventilated place. Protect from direct sunlight, frost and temperatures above manufacturer’s stated limits (typically +25 °C).
• Safety: Pressurised, flammable aerosol; contains isocyanates. Follow all hazard statements, wear appropriate PPE and consult the SDS.

Soudal Expanding Foam Gun Grade Features & Customer Benefits

• Gun‑grade precision and efficiency
  Use with a foam gun for highly controlled application, reduced material waste and
  the ability to stop and start work without discarding the can.
• High insulation performance
  The closed‑cell PU structure delivers excellent thermal and acoustic insulation,
  helping to reduce heat loss and improve acoustic comfort around frames, services and cavities.
• Excellent gap‑filling capability
  Expanding foam easily fills irregular gaps and difficult‑to‑reach voids that are
  awkward to seal with traditional materials like mineral wool or sealant alone.
• Time‑saving and easy to finish
  Fast curing and easy trimming mean installers can move quickly from foaming to finishing,
  keeping jobs on schedule.
• Versatile use across the build
  Suitable for windows, doors, roofs, partitions, service penetrations and general infill,
  making it a staple product for builders, joiners and installers.

Frequently Asked Questions – Soudal Expanding Foam Gun Grade

1. What is the difference between gun‑grade foam and hand‑held (straw) foam?

Gun‑grade foam is designed to be used with a foam applicator gun, which gives much
better control over flow rate, bead size and stop/start use. It typically offers:

• Higher yield per can.
• More precise placement and less mess.
• The ability to leave a can on the gun for longer (following manufacturer guidance) and resume work later.

Straw foams are hand‑held, one‑use solutions that are convenient for small jobs but offer less
control and typically lower yield.

2. Can Soudal Expanding Foam Gun Grade be used to fix window and door frames?

It is commonly used to fill and insulate the gaps around window and door frames, but:

• Frames should always be installed using mechanical fixings (screws, anchors, brackets) in line with BS / EN installation standards and system guidance.
• Foam is primarily for insulation, air‑tightness and support, not as the sole structural fixing.
• Take care not to overfill to avoid excessive expansion and distortion of frames.

3. Is Soudal Expanding Foam Gun Grade fire‑rated?

Standard Soudal Expanding Foam Gun Grade is generally intended as a general‑purpose insulating
and filling foam and is not necessarily fire‑rated unless explicitly stated on the product
and datasheet (e.g. B1 or EN fire classification).

For applications requiring fire resistance (e.g. compartmentation, fire‑stopping of services),
always use a certified fire‑rated foam or fire‑stopping system from Soudal with documented
EN test data (e.g. EN 1366) and follow the system installation instructions.

4. Can I use this foam on damp surfaces or in cold weather?

Yes, PU foam cures with moisture, so slightly damp surfaces and higher humidity can actually
help curing. However:

• Surfaces should not be water‑logged or covered in standing water.
• Very cold conditions will slow expansion and curing; keep cans at room temperature before use for best performance.
• Follow Soudal’s recommended application temperature range on the product data.

5. How do I remove excess foam or foam that has gone where it shouldn’t?

Uncured foam can usually be removed with:

• A suitable PU foam cleaner recommended by Soudal.
• Solvent‑dampened cloths (check compatibility with the substrate first).

Once the foam has cured, it can only be removed mechanically by cutting, scraping or
sanding. It is therefore important to:

• Mask and protect sensitive adjacent surfaces.
• Apply foam carefully and avoid over‑filling.

6. Common Uses & How to Use Soudal Expanding Foam Gun Grade

Common Uses:

• Filling and insulating around window and door frames.
• Sealing service penetrations for pipes, cables and ducts.
• Infill around lintels, cavity closers, sills and roof elements.
• Improving airtightness and thermal performance at junctions and interfaces.
• General gap filling in timber frame, masonry and mixed construction.

How to Use – Step‑by‑Step:

1. Ensure surfaces are sound, clean and lightly damp (if very dry); mask adjacent finishes.
2. Shake the can thoroughly and screw it onto a foam application gun.
3. Adjust the gun’s flow control and test on a scrap area to set the desired output.
4. Apply foam into the joint or cavity, filling only around 2⁄3 of the depth to allow for expansion.
5. For deep cavities, build up in layers, letting each layer expand slightly before adding more.
6. Allow the foam to cure; once firm, cut back excess with a sharp knife or saw.
7. Finish as required: sand, plaster, seal or paint to protect the foam from UV and achieve the desired finish.
8. Clean the gun and any uncured residues with PU foam cleaner immediately after use.