Material
Mineral Wool Insulation
The most widely used loft-floor insulation — glass or rock mineral wool rolls, laid between and across the joists to a suitable depth. Good value, widely available and well understood.
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Loft Insulation Materials Compared
No single material suits every loft. Here is how the main options compare on performance, moisture behaviour, fire, sustainability and cost — the right choice depends on your roof and an inspection, not the property age alone.
Material
Sheep Wool Insulation
A natural loft-floor insulation made from sheep's wool fibres, valued for its breathability and moisture-buffering and often chosen for older and traditional homes.
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Recycled Plastic Insulation
Loft insulation made from recycled plastic fibres — pleasant to handle, durable and a strong sustainability story, laid much like mineral wool on the loft floor.
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Multifoil Insulation
Thin, reflective multi-layer insulation fixed at rafter level as part of a warm-roof approach — very different from the soft insulation laid on a loft floor.
View| Material | Often chosen for | Watch-outs |
|---|---|---|
| Mineral wool | Value, availability, most loft floors | Irritant to handle; must not be compressed |
| Sheep wool | Older, breathable roofs; natural fibre | Higher cost; follow treatment and manufacturer guidance |
| Recycled plastic | Lower-irritation handling; sustainability | Check certification; not a universal fix |
| Multifoil | Rafter-level/room-in-roof, limited depth | Needs air gaps, taping and correct detailing |
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