Loft Boarding for Storage: How to Do It Without Ruining Your Insulation
How to add loft storage safely: raised boarding over insulation, checking the joists, safe access and what to store.
A boarded loft can give you a lot of extra storage space. Done badly, though, it squashes the insulation, makes the house colder and can overload the ceiling below. This guide explains how to add storage properly.
The quick answer
- Do not lay boards directly on top of thick insulation, as squashing it reduces how well it works
- Use raised loft legs or a raised platform so insulation keeps its full depth
- Check the joists can take the weight, and do not cut through them
- Keep boarding away from cables, water tanks and the eaves
- Fit a proper loft ladder and safe lighting
Why insulation matters
Loft insulation works by trapping air. When boards press it flat, it loses much of its effect, and your heating bills go up. The recommended depth of mineral wool loft insulation is around 270 millimetres, which is well above the height of standard ceiling joists. Raised loft legs lift the boards above the insulation so it stays at full depth.
What a loft boarding job involves
- Check access, the hatch size and the condition of the joists
- Top up insulation where needed
- Fix raised loft legs to the joists
- Lay and screw down boards on the legs
- Leave ventilation gaps at the eaves to prevent condensation
- Fit a loft ladder, a hatch catch and lighting
Safety checks
| Check | Why |
| Joist size and spacing | Ceilings are not designed for heavy loads |
| Cables | Avoid trapping or covering cables that could overheat |
| Water tanks and pipes | Leave access for maintenance |
| Eaves ventilation | Prevents condensation and roof timber damage |
| Trusses | Never cut or remove truss timbers |
What to store in the loft
- Light, seasonal items: decorations, suitcases, bedding in sealed boxes
- Items that can cope with heat in summer and cold in winter
- Not heavy items, important documents, electronics or anything that is damaged by temperature changes
Loft storage or loft conversion?
Boarding for storage is very different from converting a loft into a room. A conversion needs building regulations approval and often more structural work. Our planning permission guide explains the rules.
Frequently asked questions
Can I just lay boards on the joists?
Only if the insulation is no deeper than the joists, which is rarely the case. Otherwise use raised legs.
Do I need building regulations for loft boarding?
Not usually for storage boarding, but you do for a conversion into a habitable room.
Can you fit a loft ladder?
Yes, depending on the hatch size and the space above it.
Related guides
- Winter home maintenance checklist
- All our property services
- Winter-proofing: insulation and draught-proofing
Send photos of the loft and hatch, and your postcode, or call 07444 262522.