🧱 Why Attic Insulation Matters

Proper attic (or loft) insulation can reduce heat loss by up to 25%, cutting your energy bills and improving your home’s comfort and EPC rating. It’s one of the most effective ways to improve energy efficiency in UK homes.

🔗 See how heat loss is detected with a thermal survey »

🧰 Best Types of Attic Insulation Rolls

When choosing the best insulation for your attic, consider:

• Mineral Wool Rolls: Common and cost-effective

• Sheep’s Wool: Eco-friendly and breathable

• Multifoil Insulation: Reflective layers, ideal for tight loft spaces

• Rigid PIR Boards: Higher insulation per thickness, used for warm lofts

🔗 Compare PIR boards and insulation materials »

🧵 How to Lay Insulation in Your Attic

Installing attic insulation rolls is a great DIY project if your loft is easy to access.

Step-by-Step:

1. Clear the Loft

2. Check for Existing Insulation – top up if below 270mm

3. Install Between Joists – roll out insulation

4. Add a Second Layer – across joists to reduce thermal bridging

5. Add Walkway Boards – if needed for storage

🧯 Don’t block ventilation gaps – this prevents condensation build-up.

🔗 Professional Installation Available Here »

📏 How Much Insulation Do You Need in Your Attic?

The recommended depth in the UK is 270mm of mineral wool. For higher performance, 300–400mm with hybrid layering (e.g., PIR + wool) can deliver even better U-values.

• How thick should insulation be in attic? ➜ 270mm+

• How much insulation in attic? ➜ Measure existing & top up

• How much insulation do I need in my attic? ➜ Use your loft’s square metre area × target depth

🔗 Use our free loft insulation thickness calculator below

🐭 How to Get Rid of Mice in Attic Under Insulation

If you’ve found signs of mice (droppings, scratching, gnawed insulation), act fast:

• Remove insulation rolls carefully and inspect beneath

• Seal gaps with steel wool + caulking

• Install rodent mesh at soffits/vents

• Use traps & peppermint oil deterrents

Avoid poisons in roof spaces—dead rodents can cause odour and attract pests.

🔗 Roof inspection with drone and thermal scan service »

🔄 Cold Loft vs Warm Loft – Which Is Better?

• Cold Loft: Insulation laid between joists, roof space remains unheated

• Warm Loft: Insulation fixed under rafters, entire loft kept warm

Cold loft = cheaper and easier. Warm loft = ideal if loft is used as a room.

🛠️ DIY vs Professional Attic Insulation

• DIY saves money, suitable for basic joist roll installs

• Hire a pro if you have:

  • a boarded loft

  • need multifoil or PIR

  • condensation concerns

You may be eligible for free loft insulation under UK government schemes.

🔗 Check eligibility for free loft insulation grants »

💡 Insulation Mistakes to Avoid

• Don’t compress the insulation

• Don’t block eaves ventilation

• Don’t use foil-faced boards on cold joists without vapour control

• Don’t store items directly on insulation

❓ FAQs: Attic & Loft Insulation

Q: Can I over-insulate my attic?
A: Yes—too much insulation can cause ventilation and damp issues if not done correctly.

Q: Is foil insulation enough?
A: Not on its own—it should be layered with mineral wool or PIR boards.

Q: Will attic insulation stop condensation?
A: Yes, when installed with proper airflow and vapour control layers.

✅ Conclusion

Attic insulation remains one of the most cost-effective energy upgrades in UK homes. Whether you DIY or hire a professional, understanding your material choices, proper installation methods, and maintenance is essential.