Spreading of baby metal under slab is totally an unwanted item and waste of money. No relevance for it. If required the soil to be compacted with plate compactor when the moisture content optimum. Only to spread 250micron polyethylene sheet( which is called vapor barrier) with an overlapping 20 cm at joint is required to arrest capillary rise. Termite treatment to be made before that at various levels while backfilling.
Spreading of baby metal under slab is totally an unwanted item and waste of money. No relevance for it. If required the soil to be compacted with plate compactor when the moisture content optimum. Only to spread 250micron polyethylene sheet( which is called vapor barrier) with an overlapping 20 cm at joint is required to arrest capillary rise. Termite treatment to be made before that at various levels while backfilling.