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Thread: How to make a 20x40 liner pool into a 16x36??

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    How to make a 20x40 liner pool into a 16x36??

    Hi guys, new to the forum.
    I have a question. I currently have a 35+ year old 20x40 liner pool. The wall are made of wood. It's an old Buster Crabbe pool. It's time to either replace the pool or fill it in. I don't have the money to pay someone to replace the pool, so the choice really is either for ME to replace or... to fill in. I've done a lot of research of pool kits from various sites (polarpools.com, Royalswimmingpools.com, sunsetpools.com and others). I watched a videos of installing kits online or had DVDs sent to me. I'm pretty handy, so I'm not really intimidated by it... however, I'm smart enough to know I don't remotely know everything about building a pool.
    At first I was going to just try and buy a pool kit and replace the 20x40 pool. Now I'm thinking about trying to reduce the size of the pool. I know the walls of the pool need to rest on undisturbed ground. But, if I move all the wall of the pool in by 2 feet, once I get to the deep end, I would obviously have to build that part back up since that's where it starts to slope down into the hopper.
    I talked to one local pool guy a while ago, and mentioned that I would like to reduce the size. He said it what they would do is measure down and then notch the ground out to create a little ledge. Then use cinder block to build the wall back up to the shallow end depth thus creating a new ledge for the kit walls to rest on, and the backfill that area behind the cinder block with concrete. Then I would just install the kit within that. I figure 1. I want a slightly smaller pool and 2. this way I'll already have my "overdig", and won't have to worry about trying to dig out behind the existing walls.. if that makes sense?
    I guess my question is does this approach make sense?? Does it sound like a good strategy? Of all the pool projects I've seen on this site and online.. I have yet to see someone do a pool "reduction". I plan to take lots of pictures and share my "experience" on the forum for others to hopefully learn from.
    Also.. if anyone has a strong opinion on a pool kit that would be great. Specifically where to buy it from. I'm pretty sure I want polymer walls, not steel.
    Thanks!!
    15,700 gallon outdoor AG 18'x33' vinyl pool; Family Leisure Perma-Salt System with 1.5hp EcoKleer sand filter, 70GPM; pump runs 24x7.

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    linen's Avatar
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    Re: How to make a 20x40 liner pool into a 16x36??

    Welcome to tfp, TroyS

    Sounds like quite a project, I will be interested in your progress. Unfortunatly, I have no direct experience that is even close to doing what you want to do. Hopefully someone will be along soon that does
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Isaac-1's Avatar
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    Re: How to make a 20x40 liner pool into a 16x36??

    Ok, maybe I am missing something, but what is keeping you from just replacing the liner and continuing on with a 20x40?
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Re: How to make a 20x40 liner pool into a 16x36??

    The pool is almost 40 years old and wood. The sides are bowed. The top 2x4 that the coping sits on it rotted and it pulled away from the wall, causing the coping to come up. The coping itself is not in great shape and they no longer make this old Buster Crabbe coping. The stairs are worn and cracked. It it was just a liner problem, then that would be great for me. Then I could do like you said and just replace the liner.
    15,700 gallon outdoor AG 18'x33' vinyl pool; Family Leisure Perma-Salt System with 1.5hp EcoKleer sand filter, 70GPM; pump runs 24x7.

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    Re: How to make a 20x40 liner pool into a 16x36??

    wow... this does not seem to bode well for me. Thought I'd have some decent feedback. Of all the pool builders and people with years of pool building experience.. no one seems to have any thoughts. I can only assume that this isn't attempted too often, if at all.. and even more nervous taking on the project..
    15,700 gallon outdoor AG 18'x33' vinyl pool; Family Leisure Perma-Salt System with 1.5hp EcoKleer sand filter, 70GPM; pump runs 24x7.

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    Re: How to make a 20x40 liner pool into a 16x36??

    Our pool (concrete) is 43 years old. You have my sympathies---they can be a bit of a white elephant. Have you considered finding a pre-fab fiberglass pool that would fit into your old pool? It's an idea we've tossed around many times in the past, but we don't live in a metropolitan area so our transportation cost puts it out of the question. In my ideal universe i would hire a contractor to fabricate the form and pool on-site, then fit it in. All it would take is.....CASH!
    20 X 40 inground gunite. 38,000 gallons, Jacuzzi Dial Valve Sand Filter, Jacuzzi Magnum 1000 pump. 40 + yrs in (fairly smooth) operation thanks to cussedness and a tiny bit of hydraulic cement.

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    duraleigh's Avatar
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    Re: How to make a 20x40 liner pool into a 16x36??

    Troys,

    This forum is not made up of pool builders. The vast majority of members are pool owners like yourself that are interested in managing their own pools.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: How to make a 20x40 liner pool into a 16x36??

    I do think this is possible. But is going to be a ridiculous amount of work. I assume you have an 8 foot deep end so that would be a big block wall. I did a DIY pool in a very misshaped hole and wish would have made it larger and ordered a custome liner. Of course you would order the liner last, which i didnt do. When talking vinyl liner pools trying to get a different size kit in a hole not designed for it is like fitting a round peg into a square hole. But I think it can be done (see "Apollo13") if you have the drive, finances, and time.
    Under construction DIY 20x40 vinyl liner steel wall pool, Pentair 2hp wisperflo, Pentair tr100 sand filter, Pentair Minimax 400k heater, diving board, 8 foot sit n step, xtream waterslide, 1700 concrete deck, one amazing wife, 4 children and two German shepherds.

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