A loft space is a small, low area above the attic, directly under the ridge of the roof. It’s the topmost ‘floor’ of a house, but due to limited headroom it’s not suitable as a living space. A loft space is mainly used for storing seasonal items such as suitcases, Christmas decorations and boxes.
Characteristics of a loft space
| Feature | Typical |
|---|---|
| Standing height | 0.80 – 1.80 m |
| Access | Loft ladder or hatch |
| Floor | Loose boards or chipboard on joists |
| Insulation | Usually uninsulated |
| Heating | None |
| Daylight | None or minimal (sometimes a small roof window) |
Using a loft space for storage
- Distribute weight — Place heavy items near the walls, where joists rest on the wall
- Lay floor panels — 18 mm chipboard or OSB on the joists for a flat storage surface
- Don’t overload — A loft floor isn’t rated for residential loads; maximum 75 kg/m²
- Ventilation — Ensure the space can breathe to prevent moisture issues
Insulating a loft space
If the attic below serves as living space, it’s smart to insulate the loft floor rather than the sloping roof:
1. Mineral wool between the joists — 150-200 mm thick
2. Vapour barrier on the underside (warm side)
3. Floor panels on top — You can still use the loft for storage
This is cheaper and simpler than insulating the sloping roof.
Common mistakes
- Storing too much weight — Loft joists are thinner than regular floor joists
- Placing items against the roof — Blocks ventilation, risk of moisture problems
- No lighting — A simple light makes the loft much more usable
Related terms
- Attic
- Purlins
- Truss
- Mineral wool
- Roof insulation
- Breathable membrane