Best Expanding Foams 2026

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Last Updated - 22.07.2026

Best Choice

01

Würth

15x Würth Purlogic 1K Gun Foam Top Concrete Grey

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9.8

Exceptional

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1 tin 4.53 euros

101,00 €
02

dubaust

12 x dubaust MSP24 Construction Foam Mounting Foam Gun Foam 750 ml Combination Sets PU Filling Foam Insulation Foam High Sound Insulation Thermal Insulation Insulating B2 750 ml

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9.5

Excellent

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Very good adhesive properties
Sound insulation 62 dB / insulation value (DIN 52612) 35.4 mW/m.K
High filling capacity (approx. 45 litres)
High dimensional stability (no shrinking or re-stretching)
Good adhesion to all surfaces (except PE, PP and PTFE)
For sealing all openings in the roof construction and similar
For mounting window and door frames

73,90 €
03

fischer

fischer Rapid Installation Foam PU S 750, Construction Foam for Backfilling, Insulation and Damping, Polyurethane (PU) Foam, incl. Instant Use Adaptor 750 ml

34% Off

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9.4

Excellent

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Ready for use: The quickly-mounted adapter allows for immediate use. No additional processing devices are required
Contents: 1 x fischer foam PU S 750 B2 (750 ml) with an adapter, without protective gloves, only suitable for commercial use
Building materials: Adheres to all standard building materials, e.g. Concrete, anodised layer, plasterboard, wood, sand-lime brick, PVC materials (including resins with high degree of polymerisation – HPVC), masonry, metals, plaster
Applications: For insulating and filling window connection joints around window sills as well as roller shutter boxes, finished elements, wall connections, wall openings and cavities and much more
All-rounder: The rapid installation foam with proven high level of sound insulation and water pressure resistance is suitable e.g. for window joints or for bonding concrete shaft rings

8,27 € 12,59 €(34% Off off)
Value for Money

04

fischer

fischer Gun Foam PUP S 750, Expanding Foam for Backfilling, Insulation and Damping, Airtight and Waterproof Construction Foam for Foam Guns, 750 ml

49% Off

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9.3

Excellent

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Universal: The airtight, water-pressure-resistant gun foam with tested joint sound insulation and thermal insulation is suitable for window and door insulation or for sealing well shafts
Manufacturing: The low amount of foam expansion during curing avoids the need for reworks and so ensures quick and easy processing
Contents: 1 x fischer gun foam PUP S 750 B2 (750 ml), without protective gloves, only suitable for commercial use! Target group:
Building materials: Adheres to all standard building materials, e.g. Concrete, anodised layer, plasterboard, wood, sand-lime brick, PVC materials (including resins with high degree of polymerisation – HPVC), masonry, metals, plaster
Applications: Insulate and fill window connection joints, window sills and roller shutter boxes, wall openings, cavities, wall connections and finished elements and much more

6,41 € 12,59 €(49% Off off)
05

AquaForte

AquaForte Landscaping Mounting Foam 500 ml

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9.0

Excellent

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PET ACCESSORIES
Aquaforte Landscaping Mounting Foam 500ml
AquaForte

12,90 €
06

Soudal

Soudafoam B2 Gun Foam Mounting Foam PU Foam Set of 6 with Cleaner 500 ml

11% Off

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8.9

Very Good

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Professional quality for craftsmen and DIY enthusiasts
PU foam B2 fire protection class for increased safety
Includes 500 ml cleaner for easy care of the foam gun
Ideal for window and door mounting as well as insulation work
High yield and good adhesion to various materials
6 cans of gun foam for extensive assembly work

41,00 € 45,99 €(11% Off off)
07

Soudal

Soudafoam Gun B2 Filling & Insulation Foam 750 ml (Gun Attachment) Economy Set

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8.8

Very Good

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You will receive a set of 3, 6 or 9 bottles of Soudafoam B2, 750 ml.
With excellent sound and heat insulation and excellent shape retention.
Warning: Gun attachment (foam gun required).
Soudafoam B2 is a ready-to-use, one-component, self-expanding rigid polyurethane foam.
Foam pistol not included!

38,23 €
08

Pattex

Pattex 1996887"Classic" Assembly Foam, White, 500 ml

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8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Versatile application - The PU foam is ideal for wall openings, cavities and even fountain construction, adheres very well to standard surfaces.
Strong insulation - The insulation foam prevents cold and sound bridges and thus ensures optimal insulation indoors and outdoors.
Practical box contents - Pattex PU foam classic mounting foam, powerful insulation foam according to building material class B2, after 1 hour. Can be cut, 1 x 500 ml can
High resistance - Age-resistant and rot-resistant construction foam with long-lasting dimensional stability after curing for long-lasting applications.
Filling & Insulating - PU mounting foam for safe filling and insulation of door and window frames as well as insulating wall openings and cavities.

12,98 €
09

SDV Chemie

SDV Chemie Mounting Foam B2 1 x 500 ml Building Foam

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Versatile applications: excellent for quick and safe installation and insulation of door frames, wooden door chucks and window elements. Sound and heat insulation, avoids cold bridges. Particularly beneficial for narrow sealing areas
Universal PUR mounting foam B2: one-component foam for gluing, mounting, insulating, sealing, insulating and filling gaps, cavities and joints with very good sound and heat insulation, dimensional stability and very good adhesion
Temperature resistance: range of application from -40°C to +90°C for permanent applications
High foam yield: free foams approx. 35 litres at +20 °C - strand foaming (approx. 2 cm diameter) approx. 40 running metres from a 500 ml can
Excellent adhesion: sticks very well to a wide range of surfaces such as concrete, masonry, plaster or wood and to most plastics
Building material class B2: normal flammable according to DIN 4102 part 1

5,50 €
10

fischer

fischer Rapid Installation Foam PU 500, Building Foam for Backfilling, Insulation and Damping, Polyurethane (PU) Foam, incl. Quickly-Mounted Adapter for Instant Use and Reuse, 500 ml

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8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Reliable damping and insulation: The waterproof expanding foam is ideal for sound insulation and ensures a reduction of noise, while providing good thermal insulation, e.g. when working with roof trusses
Practical, no additional foam gun needed: To process the polyurethane (PU) foam, you do not need a separate processing device, as the quickly-mounted, lockable adapter ensures it is ready to use immediately, so that opened dispensers can be reused
For numerous building materials: The polyurethane foam adheres reliably to all standard building materials, such as Concrete, anodised layer, plasterboard, sand-lime brick and masonry – thanks to the tested water pressure resistance, the foam is also ideal as a special foam for well shafts
Contents: 1 x 500 ml rapid installation foam PU 1/750 (item no. 50426), construction foam with German building authority certificate. B2 fire rating, incl. Protective gloves from fischer
Areas of application: The filling foam is suitable for the insulation and filling of finished elements, window connection joints, for installing window sills, roller shutter boxes as well as in roof construction, construction with drywall, for gluing and sealing shaft rings and much more

12,75 €