Right, here is an interesting one for all the experts out there and some information for anyone that might find themselves in a similar situation.
I have a large outside seating area which is fully tiled with medium format tiles. The whole area is covered by a roof and there is an adjacent tiled area covered by a semi transparent roof, which is where I intend to set up my Ultra Frame Rectangular Pool 32' x 16' x 52" when it arrives. In other words the pool will rest on smooth tiles. I currently have my 15' round metal frame pool on this area where it has sat for nearly 2 years.
Length ways the tiled area is dead level.
Width ways the tiled area has a Grade of 1.69%. This is so that, firstly we can wash it down and water will run off the tiled area and secondly, during the monsoons any water that does enter the area will drain away.
With the first, round pool, I did nothing to adjust this level and, consequently, the water level on furthest side was higher on the pool liner (by about 68mm or 2 43/64" in old money). It has sat happily like this.
The new pool will run length ways down the area, which is level. Consequently the pool will be level length ways.
I have two choices with the with of the new pool:
A) do the same as with the first pool and just accept that the level will be off by approximately 76 mm (3 1/32") width wise.
B) Adjust the height of the posts (width wise) on one side only, to raise the rail height width wise and level the water around the sides of the pool.
I am inclined to go with B.
Obviously these pools have three separate dimensions, Top rail width/length, Bottom width/length and Outer width/length (where the bottom of the support rails rest).
I want to raise the Rail height and so I have used Top rail width to calculate the rise needed, but obviously the blocks that I make will be placed under the outer rails which, although further apart, actually raise the rail height. Bottom width of the pool is wider than rail width as well.
I will be putting no blocks under the 8 brace/supports on the near side of the pool.
On the outer side (across the width of the pool), I will be placing 76.63 mm plained pressure treated wooden blocks under the 8 brace/supports to raise the outer rail height by 76.63 mm (3 1/32").
I have calculated the rise height for each of the 4 brace supports down the width sides of the pool and will be putting different sized blocks under each pair of brace/supports on both width sides of the pool. Brace 1 being the brace closest to the length side that has no blocks under the braces.
Brace 1 = 17 mm Block
Brace 2 = 34 mm Block
Brace 3 = 51 mm Block
Brace 4 = 68 mm Block
I am attaching a diagram so that you can see what I am talking about.
Now I appreciate that this is going to put different pressures on the liner, but my rough calculations suggest that, because of the perfect gradient of the tiles underneath the liner and the gradual change in rail height the liner should cope fine and weight will just be redistributed along the liner.
Opinions from those with experience welcomed.