Keeping your home warm / heating / energy crisis / insulation etc

There's stuff that you can get in and taken out later if needs be. It's loose like packing chips but obvs. doesn't degrade. They can drill another hole later and suck it out.

@dbr has filled his cavities with thousands of tiny polystyrene balls (ooh err) so he might be able to help.

Personally I don't like the idea of spray anything when it comes to insulation.

Do you know what's under the ground floor?