Here's a pic of the base framework of our 18x34 buttressless oval pool. The most important part of setting up any type of pool is getting the patio blocks set as close to perfectly level as possible, and use larger ones on the sides under the side uprights as that's where the most of the pressure will be. If you have to "fill" in anything - use stone dust/ aka crusher, screenings... like Matt said. I had to drive 3 hours to a Quarry to get some in Nebraska. Local gravel places... don't carry it here. It's basically crushed limestone. Not powder limestone, though- don't confuse that. As said- you can't build up an oval because of the strapping system underneath it. you can see the metal straps in the photo on ours.
After assembling the walls- we put on the wall foam, coving strips on the bottom (the kind with the peel away tape are wonderful), then spread our sand and compacted it good, then put on a blue wave pad, liner, water, steps... we were too tired for the margarita part, lol. The pool pad helped to keep footprints out of the sand, but it was really hot the day we put ours up, and the liner didn't slide well on it. Don't forget to pile your sand and liner inside the pool area before putting up your walls. Not sure exactly why you want to use styrofoam??? Also- make sure you have some slope running down and away from your pool.
Matt gave me very good instructions for vacuuming the liner while you fill it - it worked great for us and saved us a bunch of wrinkles. My 9 yr old manned the switch on the vac for me, as it'll make an aweful sound when all the air is out, and you'll have to shut it off then. Wait a little bit- then run it again.
For us - the strapping system and the extra details that come with an oval, took as long to assemble as probably a whole round pool. Just a price you have to pay if that's all your yard will accomodate. Professionals charge more too- for that reason, to install an oval vrs. a round. I'm confident mine is every bit as sturdy and secure as any round out there.
DIY is a lot of work - would I do it again, probably not, lol, mainly because my hubby isn't fond of our pool, and it was a big job, don't kid yourself! Great pride in it now, though! Even my 9 year old helped a lot with both our pool and deck, and tells everyone who comes to swim. It's all worth it in the end!
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