Top 5 Foam Filler for Crack Sealing
Foam fillers for crack sealing are expanding polyurethane (PU) foams designed to penetrate and seal gaps, cracks, and fissures in walls, concrete, masonry, and around service penetrations. These foams expand to fill irregular spaces, block air and moisture entry, and improve long-term durability of structures.
Where Crack Sealing Foam Is Used
Crack sealing foams are commonly used in:
- Hairline and structural cracks in walls and slabs
- Joints between masonry units
- Gaps around pipe and cable penetrations
- Cracks in concrete and plaster surfaces
- Expansion and movement joints
Key Qualities of Crack Sealing Foam
Choosing the right foam ensures effective sealing.
- Controlled expansion to avoid unnecessary pressure
- Strong adhesion to building materials
- Good flexibility to accommodate movement
- Effective insulation against air and moisture
Companies Name
- Palco
- Bostik
- Soudal
- Sika
- Fosroc
1. Palco PU Crack Sealing Foam
Palco PU Crack Sealing Foam is formulated to penetrate and fill narrow cracks effectively.
- Controlled expansion for deep crack penetration
- Strong adhesion to concrete, brick, and masonry
- Seals air and moisture entry points
- Can be finished after curing
2. Bostik PU Expanding Foam for Cracks
Bostik expanding foam works well for sealing cracks and gaps in structures.
- Good bonding with various substrates
- Controlled expansion and fill pattern
- Improves airtightness and insulation
3. Soudal Crack Sealing PU Foam
Soudal PU foam is widely used for crack sealing in construction.
- Stable and uniform expansion
- Effective for small and medium cracks
- Suitable for interior and exterior surfaces
4. Sika Boom Crack Fill Foam
Sika Boom range includes foams that are suitable for sealing cracks and voids.
- Uniform cell structure for consistent sealing
- Good adhesion and flexibility
- Reduces air and moisture movement through cracks
5. Fosroc PU Crack Filling Foam
Fosroc foam is designed for sealing cracks and improving structural performance.
- Controlled expansion to avoid pressure buildup
- Seals cracks effectively once cured
- Helps improve energy efficiency and moisture control
Common Site Mistakes When Sealing Cracks
Avoid these errors for effective crack sealing.
- Applying foam to dusty or dirty cracks
- Using high-expansion foam that can push materials apart
- Not cleaning and prepping cracks before foam application
- Skipping trimming and finishing after curing
Frequently Asked Questions (FAQ)
1. Can foam filler seal both small and large cracks?
Yes, controlled expansion foams can seal a wide range of crack sizes.
2. Does foam sealing prevent moisture entry?
Yes, properly applied foam blocks air and moisture infiltration.
3. Can cured foam be plastered or painted?
Yes, most foams can be trimmed and finished once fully cured.
4. Is crack sealing foam flexible?
Many PU foams retain flexibility to accommodate minor movement.
5. Should cracks be cleaned before foam application?
Yes, cleaning improves adhesion and sealing performance.
Raltro
Raltro is a construction knowledge platform focused on correct material selection and practical site solutions. By explaining the top foam fillers for crack sealing and their key qualities, Raltro helps builders and contractors choose effective sealing products that enhance energy efficiency, block moisture, and deliver long-lasting performance in construction applications.