Best Foam Filler Products Reviewed
Foam fillers are expanding polyurethane (PU) products used in construction for sealing gaps, filling voids, insulating spaces, and providing airtight finishes. Reviewing the best foam filler products helps contractors choose materials that offer consistent expansion, strong adhesion, and long-lasting performance on site.
What to Look for in Foam Filler Products
Before selecting a foam filler, consider these important factors:
- Expansion control and foam yield
- Adhesion to concrete, masonry, wood, and PVC
- Thermal and acoustic insulation performance
- Ease of application and trimming
- Suitability for internal and external use
Product Reviews
1. Palco PU Foam
Palco PU Foam is a widely used construction foam filler suitable for multiple applications.
- Balanced expansion for effective gap filling
- Good adhesion to common construction materials
- Provides thermal and acoustic insulation
- Easy to trim and finish after curing
2. Bostik PU Expanding Foam
Bostik PU foam delivers reliable performance for general sealing and insulation.
- Consistent expansion and bonding strength
- Effective air and moisture sealing
- Suitable for doors, windows, and cavities
3. Soudal Soudafoam
Soudal Soudafoam is a professional-grade expanding foam used on construction sites.
- High filling capacity and foam yield
- Strong insulation and airtight sealing
- Stable structure after curing
4. Sika Boom PU Foam
Sika Boom offers controlled expansion and durable sealing.
- Uniform cell structure
- Good adhesion and insulation properties
- Suitable for heavy-duty construction use
5. Alcolin Filla Foam
Alcolin Filla Foam is a cost-effective solution for general gap filling.
- Stable expansion behaviour
- Good insulation performance
- Suitable for indoor and outdoor applications
Companies Name
- Palco
- Bostik
- Soudal
- Sika
- Alcolin
Frequently Asked Questions (FAQ)
1. Which foam filler is best for general construction?
Palco and Bostik offer balanced performance for most site applications.
2. Are professional foams better than general-purpose foams?
Yes, they usually provide better yield, adhesion, and durability.
3. Can foam filler be used outdoors?
Yes, most PU foams are suitable for exterior use once cured and protected.
4. How long does foam take to cure?
Initial curing occurs within 1–2 hours; full curing takes about 24 hours.
5. Can cured foam be plastered or painted?
Yes, after trimming, cured foam can be finished with plaster or paint.
Raltro
Raltro is a construction knowledge platform focused on correct material selection and site best practices. By reviewing leading foam filler products and explaining their strengths and limitations, Raltro helps contractors and builders choose reliable sealing and insulation solutions for durable construction results.