Hello - This is a great place for information. I just recently purchased a home outside of chicago with a steel frame inground pool measuring about 20 x 40 or 22,000 gallons. The pool is old, built in 1975 and does have some significant evidence of ground heaving as the sides of the pool are bent inward. I have been told by neighbors and the owner the pool has been this way for 20+ years and the pool was constructed very well.
The pool had a new liner installed this spring 2013, presumably to freshen up the pool to sell the home. The pool inspector explained the technician did a good job with the liner considering the condition of the walls. The corners of the pool are perfectly square and are do not show the bowing I describe above. My question is, the liner where it attaches to the coping at the top appears to be stretched around the corner - more rounded and loose feeling. Below the water line it is adhered to the walls forming a crisp 90 degree bend with the walls. Is there a reason for doing this ? The liner at all 4 corners and at the tops of the stairs is loose feeling.