Blown insulation: for low or awkward lofts, and what to check
Loose fibre blown across the loft floor reaches corners rolls can’t. It suits low lofts, but it can drift into the eaves and block the airflow if it isn’t contained.
Illustration: loose insulation blown across the loft floor
| What it is | Loose mineral wool or cellulose fibres |
|---|---|
| Where it goes | Spread across the loft floor, over the joists |
| Good for | Low, cramped or awkward lofts |
| Watch for | Drifting into eaves, blocking ventilation |
| Fix | Eaves trays and a clean, dry loft first |
Where it helps
Some lofts are too low to crawl around with rolls. Blown fibre is pumped through a hose and settles evenly over the floor, getting into corners and around obstructions.
What can go wrong
Loose fibre moves. Without trays at the eaves it drifts into the gap where air should flow and blocks the ventilation. If it gets wet it clumps. And it’s hard to walk on or store over.
How we use it
We fit eaves trays first, make sure the loft is dry and clean, and blow to an even depth across the floor. If you need storage, we’ll suggest rolls and a raised floor instead.
Common questions
Can blown insulation be removed?
Can I store things on it?
Tell us what you’ve found. We’ll find the cause.
Describe the problem and we’ll look, explain it and quote the fix in writing. Free.