Cellulose Blow-In Insulation

After some forward and backward, we decided to use environmental friendly cellulose for insulation. The stuff is basically made out of recycled newspapers, with the addition of fire retarding borates, a naturally occurring salt that is harmless to human health and the environment.

In this case we do not need to put insulation material before attaching the membrane, but the other way round: The membrane is added first and sealed, and then the blow-in machine's tube is inserted into a small hole cut for this purpose. The contractor then feeds the cellulose packs into a machine that shreds it and then blows the fibres into the cavity. After the cavity is filled up, the hole is sealed with a tape.

The advantage of this approach is that even the uneven walls, beams and posts can be packed in tightly with insulation material.

This shows one of the bedrooms being prepared for the blow-in contractor.


This is the outside of the house, now including the new window frames. and a new wall segment.



The living room is regarded as relatively "cold" because of the window-front, and the bed-rooms are therefore insulated from it.