This question is most probably meaningful when there is a lot of area to build a single house. The main purpose is to keep the heat inside in winters, where it rarely drops below -5 degrees Celsius.
The concept house -with a living area of no more than 60m2- is designed in a way that its concrete walls are covered /surrounded by a sand barrier. The concrete walls are 5cm thick and 220cm high while the sand barrier is ~40cm thick and ~150cm tall. Several windows are planned to be placed between the sand barrier's top and the ceiling.
So, what should be taken into account before attempting to use sand as an insulation material in that way? For instance:
- What is the ideal grain size?
- When damp or wet, how effective would the sand barrier be?
- Is it easy to keep the sand dry, especially in rainy climates? Would the sand barrier absorb the moisture in the air -even when covered by a roof? What type of sand would be the best?
- What plants and other organisms would grow up in the sand?
- What constructional and functional complexities would be encountered?
The list may go on...
Considering all these and more, do you think a sand barrier is an effective, reliable and 'long term' solution for heat insulation? Thank you.