Abstract: A method of constructing a swimming pool by laying a concrete shell of 80 mm thickness without any substantial reinforcement. A glass reinforced plastic of 5 mm thickness is then laid over the concrete once the concrete has cured. This particular combination between the fiberglass and the concrete shell allows the shell to crack and move in relation to the reinforced plastic layer, without transmitting any stresses to the reinforced plastic layer. This results in a pool which allows any stresses due to soil subsidence, movement, etc. to be transmitted to the concrete shell and not the reinforced plastic layer thereby leaving the plastic layer free of cracks.