| I would have to agree with Dick on the filtration. The type of construction method is secondary to filtration and circulation.
If we back up a little, determine whether the shell needs to be one solid piece or not, depending on the nature of the soil and the posibility of hydraulicing, we might save some money.
If the concrete shell does not have to cover the floor, only the perimeter walls and drains need to be in concrete. This is the way I do EPDM. Eliminate the cost of the entire floor in concrete which is just under 45% of the shell and cover the floor area in geotextile with the entire structure shot in polyurea there could be some significant savings. The wall doesn't have to be shotcrete but can be formed and poured or built as a footer with block. |