Home improvement additive promising to minimise cracking and shrinkage in mortar and non-structural concrete, while improving freeze/thaw and impact resistance. Practical reassurance for builders and DIYers who need more durable repairs and finishes, with easy mixing for small jobs, Bostik Fibres for Concrete. Is the 150g pack the right size for the job at hand?
⚡ At a Glance
- • Crack Resistance: Reduces micro-cracking and shrinkage during curing for cleaner finishes
- • Best for: DIYers, plasterers and masons tackling mortar and non-structural concrete repairs
- • Not ideal for: Structural, load-bearing concrete where engineered reinforcement is required
Dispersed fibres mix into mortar and non-structural concrete to limit cracking and shrinkage. Formulation also improves freeze/thaw and impact resistance for more durable surfaces.
Reduced surface cracking – thanks to dispersed micro-fibres
Fibres distribute through the cement matrix and bridge microcracks as the mix cures, interrupting crack propagation and reducing shrinkage stresses. Even distribution ensures performance across the full batch.
Fewer visible cracks during drying and curing, delivering neater repairs and less rework for small-scale jobs.
Greater resilience to freeze/thaw and impacts – with reinforcing fibres
Fibre reinforcement increases toughness by absorbing and distributing impact energy and by limiting water-related micro-damage during freeze/thaw cycles. The result is improved resistance at the surface layer of non-structural mixes.
Surfaces stand up better to weathering and knocks, extending the usable life of render and patch repairs.
Simple integration into mixes – thanks to an easy-to-disperse form
Fine fibres are formulated for quick, even dispersion when mixed into mortar or concrete, avoiding clumping and ensuring consistent reinforcement throughout the batch.
Quick to add during normal mixing, saving time on site and ensuring predictable results for small repairs.
✨ The 4 Key Reasons for Bostik Fibres for Concrete
- Even fibre distribution – Ensures consistent reinforcement throughout the mix for reliable performance
- Easy to disperse – Speeds up mixing and reduces labour on small jobs
- Enhances bonding – Contributes to stronger mortar and more durable finishes
- Improves freeze/thaw resistance – Reduces weather-related deterioration of surface repairs
📋 Technical Details at a Glance
- Category: Home Improvement
- Brand: Bostik
- Product type: Fibres for concrete and mortar
- Pack size: 150g (as indicated in product name)
- Product ID: B09W6749Z1
❓ Frequently Asked Questions
Q: How are the fibres added to a mortar or concrete mix?
A: Add the fibres during normal mixing so they disperse evenly through the batch; user feedback notes straightforward mixing and no-split application.
Q: Can these fibres be used in structural or load-bearing concrete?
A: No, the product is described for mortar and non-structural concrete, so engineered reinforcement is required for load-bearing applications.
Q: Do the fibres improve resistance to freezing and impacts?
A: Yes, product information states they improve freeze/thaw and impact resistance in mortar and non-structural concrete.
🏆 Our Verdict
Suitable for DIYers, plasterers and masons working with mortar or non-structural concrete, especially for repairs and renders. The key advantage is dispersed fibre reinforcement that reduces cracking and boosts freeze/thaw and impact resistance. While cost depends on job size, improved durability helps avoid repeat repairs and adds long-term value.
