Sometimes fine sand is used to backfill but more often insulation boards are laid against it before backfilling, particularly in an inhabited room.

The space between the two floors can also be layered with a compressed fiberglass insulation board.

Though it is denser than conventional wood, it is the lightest and weakest type of fiberboard, except for insulation board.

Step-by-step, Roger explains: "The first thing to go up is the rebar grid, then the insulation boards.

In one study, conducted on papyrus growing in the Hula Valley swamps, an original process was developed to produce high-quality insulation boards.

The recycled polystyrene is also found in building materials: insulation board (which further conserves energy), lumber and concrete.

They have to be suspended from battens and are most often made from pre-finished, slotted insulation board, polystyrene or fibreglass.

The interior finish is thin insulation board covered with fabric.

If you use rigid insulation, check local fire codes to see if they require covering the insulation boards with gypsum board.

One or more layers of insulation board or foam are added on the outside of the waterproofing.