CBF is shown being used both in strips and in full U-sections in typical ground beam applications.
CBF is a tough, rigid material and any reasonable backfill material may be used, in most cases excavated from the same site.		Spacers clipped to the reinforcement cage ensure the beam profile is maintained.
	CBF relies on backfill being placed behind the board to counteract the pressure exerted by the concrete pour.
		CBF is easily adapted to suit variations on site, such as pipes, cables and other services.