Blown wool

We blow loose mineral wool into ceilings, lofts and timber-frame walls. The layer fills every gap and leaves no seams.

usual layer on a ceiling: 300–500 mm
thermal conductivity, W/mK: λ 0.037–0.041
fire class: non-combustible: A1
one continuous layer: 0 seams

Blown wool is finely chopped mineral wool, delivered by machine through a hose into places where boards cannot fit tightly: between ceiling joists, into lofts, niches and closed timber-frame wall cavities.

Blown wool wraps around joists, cables and pipes, so there are no gaps for heat to escape through. It is a fast way to insulate the ceiling of a new or an old house, often without removing any finishes.

Where we blow it

Cold loft floors
Ceilings between timber joists
Closed timber-frame wall cavities
Niches and hard-to-reach spaces
Old ceilings, without removing finishes

How we work

We assess
From the area, the ceiling build-up and the thickness you want, we work out the amount of wool and the price.
We prepare
We check there is a vapour control layer under the wool and mark the target depth.
We blow
The machine stays outside; only the hose goes into the loft. We level the layer to the marked depth.

Questions

Does blown wool settle?

Mineral blown wool installed at the right density settles very little. Manufacturers state how much wool each square metre needs to keep its depth, and we follow that.

Can an old house be insulated this way?

Yes. Blown wool suits old houses because it can go on top of the existing ceiling or through small openings, without taking the ceiling down.

How long does it take?

It is one of the fastest ways to insulate: a typical house ceiling usually takes one working day. We give the exact time once we have seen the job.