In some homes the floor or ceiling is not insulated and the gaps are not great enough for people to install the standard insulations. Walls have been insulated via holes and expanding foam but requires reasonably closed off spaces.Sub-floors with bearers and piles can be 400mm or less giving an area
quite open but inaccessible (unless the floors are taken up).
I propose, a vacuum packed tube of insulation, which can be threaded through the sub-floor via draw strings or poling to lay on the ground. Once in place, the insulation is then released from the packaging, expanding from a tube diameter of 100mm to a block of fluffy insulation 600x500mm. I was imagining something like those vacuum storage bags that shrink down clothes for storage but remotely releasable and containing fluffy insulation.
It would be nice for the insulation to have water repelling properties as the ground under a house can release moist. If the insulation was Toblerone shaped then the base of the expanded insulation could have a water proof coating.
If the fluffy structure was quite springy it could accommodate around services and building sub-structure. I am imagining a woolen fleece like material, quite feathery.
The only real problem is the release mechanism.The insulation packaging has handle being evacuated but also open on command. I did think of a heating element which could be hooked to a battery but seems expensive. Although, the expense is going to be in the packaging. A small charge would be exciting but the release maybe only partial.
So, an expandable idea or not?