🏡 PIR vs EPS vs Mineral Wool: Which Insulation Is Right for Your Home?
- Mihai
- 21 hours ago
- 2 min read
With energy costs rising and stricter building regulations, choosing the right insulation is no longer optional—it’s essential. Whether you're upgrading your home or working on a new build, the right insulation can significantly reduce heat loss, improve comfort, and lower your energy bills.
But with so many options available—PIR, EPS, Rock Wool, and Glass Wool—how do you choose?
Let’s break it down 👇
⚡ Quick Answer (Key Takeaways)
Best for thin walls / high performance: 👉 PIR
Best value for money: 👉 EPS
Best for fire safety & soundproofing: 👉 Rock Wool
Best for budget loft insulation: 👉 Glass Wool
🔍 Understanding Your Options
🔶 PIR (Polyisocyanurate)
Excellent thermal performance (best in class)
Ideal where space is limited
Moisture-resistant
❗ Not breathable & combustible
👉 Perfect for: roofs, floors, internal insulation
🔵 EPS (Expanded Polystyrene)
Cost-effective and lightweight
Common in external wall insulation systems (EWI)
Good thermal performance
👉 Perfect for: external insulation, floors, cost-driven projects
🪨 Rock Wool (Stone Wool)
Non-combustible (highest fire rating 🔥)
Excellent acoustic insulation
Fully breathable
👉 Perfect for: apartments, party walls, fire-critical areas
🧊 Glass Wool (Fibreglass)
Most affordable option
Easy to install (DIY-friendly)
Good thermal and acoustic performance
👉 Perfect for: lofts, attics, general insulation upgrades
🔥 Fire Safety Matters
If fire safety is a priority:
✅ Rock Wool = safest option (non-combustible)
⚠️ PIR & EPS = combustible (check system compliance)
💧 Breathability vs Airtightness
Older homes / solid walls: go for breathable insulation (Rock Wool)
Modern airtight homes: PIR or EPS can work very well
👉 Choosing the wrong system here can lead to condensation issues.
💰 Cost Comparison
💰 Lowest: Glass Wool
💰💰: EPS
💰💰💰: Rock Wool
💰💰💰💰: PIR
👉 But remember: cheapest upfront ≠ best long-term value
🧠 So… What Should You Choose?
It depends on your priorities:
Want maximum efficiency in minimal space? → PIR
Working with a tight budget? → EPS or Glass Wool
Need fire protection and sound insulation? → Rock Wool
Renovating an older property? → Breathable solution (Rock Wool)
⚠️ Don’t Forget: Installation Is Everything
Even the best insulation will underperform if installed poorly.Gaps, compression, or bad detailing can reduce efficiency by 20–30%.
📞 Need a BER Assessment for Your Property?
At MTS DNC Energy Consultants Limited, we help homeowners and developers understand and improve their building’s energy performance by providing:
✔ Accurate BER ratings
✔ Guidance tailored to your building type
✔ Cost-effective strategies to meet regulations
✔ Recommendations for long-term efficiency
👉 Contact us today for expert advice or to schedule your BER assessment.
For further inquiries or assistance, feel free to contact us.
Disclaimer:
The information provided in these posts is for informational purposes only and should not be considered design advice, specifications, or a calculation template. We assume no responsibility or liability for the use of the information presented. For professional advice or design services, please contact us via our contact form.
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