24/08/2026
Planning to top up your loft insulation before energy bills creep up? The thickness you actually need depends on the material you choose!
Here is a quick breakdown to help you pick the right option for your home 👇
🔹 Mineral Wool Rolls (Glass & Rock Wool)
• Required Thickness: 270mm – 300mm
• Best For: Standard, unused attics on a budget.
• The Verdict: Super easy to roll out yourself, but because it needs to be nearly 30cm deep, it makes boarding out your loft for storage trickier.
🔹 Rigid PIR Boards (Celotex, Kingspan, etc.)
• Required Thickness: 120mm – 150mm
• Best For: Loft conversions & boarded storage space.
• The Verdict: Maximum thermal efficiency at half the thickness. Costs more upfront, but saves heaps of space so you can easily lay floorboards on top.
🚚 Need insulation fast? We deliver top-grade trade materials straight to your site or doorstep in 24–48 hours!
👉 Browse our full loft insulation range online!
https://www.insulationshop.co/loft_insulation.html