20x40 rectangle liner pool convert to cinder block/concrete pool

mcrandolph83

Member
Mar 26, 2021
6
West Deptford, NJ
I've read a few threads on here and I'm trying to get a better answer to this. What I want to do is remove my liner (20x40 4' shallow to 8' deep) and construct a cinder block/concrete pool. I'll be doing most of this DIY, but will be done next year as I am currently out of country for work. Here are my plans:

Before I begin, I bought this house 2 years ago and the pool came with it. The pool was left unattended/no maintenance for about 8 years. The "long walls" both caved in. I spent about $20K to have "professionals" come in and "fix" the walls, reshape the bottom and slopes and install the liner. Yeah, I fired them after the 3rd attempt of them saying "we can't fix this because of ground water". I had to reshape (to the best of my abilities) and tackle the ground water, which later I found out they had no clue what they were doing. The pool is in service and has been for 2 seasons. However, the shape of the bottom is horrible and I feel the whole area is out of date.

What I want to achieve with this build is:
1. Raise the pool 24" but keep the same depth. Currently I have a deck (pictures to follow once I locate them) that is roughly 24" above my pool deck. I plan on raising my pool to become even with the deck. This will help me with my ground water issues.
2. I do not like having sloping walls and prefer straight down the side walls.
3. I plan on moving all my equipment to a different area and creating a "pump house"
4. I would like to have concrete/cinder blocks as my main structure (no liner or fiberglass if i can help it)

My question is, am I setting myself up for failure to want to redesign my whole pool area? I've already done some quick math for the pool itself, cinder blocks, rebar, motor, concrete, concrete floor and that comes out to about $6K with me doing all the labor (minus pouring and shaping of the concrete floor) thanks for any advice and help.

Matt
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,649
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Interesting project.

How do you intend to waterproof the concrete/cinder blocks?
 

mcrandolph83

Member
Mar 26, 2021
6
West Deptford, NJ
Interesting project.

How do you intend to waterproof the concrete/cinder blocks

Interesting project.

How do you intend to waterproof the concrete/cinder blocks?
After building the walls, I intend on "stuccoing" them, I say stucco because I don't know the correct term. But basically I will be coating the inside with a stucco mix. I read online that I can use some products on top of that to water proof it,I just don't know the correct products at this moment to use.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,649
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
After building the walls, I intend on "stuccoing" them, I say stucco because I don't know the correct term. But basically I will be coating the inside with a stucco mix. I read online that I can use some products on top of that to water proof it,I just don't know the correct products at this moment to use.

You should consider having pool plaster installed for waterproofing.

Stucco that is waterproofed does not mean it will last in a submerged pool application.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,024
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
I believe you will find it is much better to use a vinyl liner for a cinder block pool. Do a search here of the forum.
I suggest you read ABC's of Pool Water Chemistry.
 

mcrandolph83

Member
Mar 26, 2021
6
West Deptford, NJ
I'll look into the pool plaster and costs. Thank you.

Mknauss: I wanna move away from having a liner. I don't like sloped walls and every liner I see has sloped walls. At about 4 feet all around the pool I'm going to make a ledge coming from the wall to stand on.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,024
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Like I said, there are other cinder block pools that have been highlighted here in the forum. All that I know of have liners. And they do not have sloped walls. You build the pool with block and concrete and then water proof it with the liner.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,024
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
A couple examples. Lots more where they came from.
 

sls

Member
Jun 13, 2007
15
Poplar Bluff, MO
Here is my concrete block pool with a liner with no slope on the sides. I like it because you don't have to worry about hitting a diving pit. It has a gentle slope from shallow to the deep end which is also good with kids. You don't have worry about them going past the ledge and sliding quickly into deep water.
 

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mcrandolph83

Member
Mar 26, 2021
6
West Deptford, NJ
Here is my concrete block pool with a liner with no slope on the sides. I like it because you don't have to worry about hitting a diving pit. It has a gentle slope from shallow to the deep end which is also good with kids. You don't have worry about them going past the ledge and sliding quickly into deep water.
What is the floor made of? Is it just a concrete floor or is it vermiculite? Thank you for the example. I'll definitely look into it.
 

mcrandolph83

Member
Mar 26, 2021
6
West Deptford, NJ
A couple examples. Lots more where they came from.
Thank you so much. This will help me out tremendously.
 
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sls

Member
Jun 13, 2007
15
Poplar Bluff, MO
What is the floor made of? Is it just a concrete floor or is it vermiculite? Thank you for the example. I'll definitely look into it.
Actually it is sand, but it could be concrete or vermiculite. It takes more time setting the liner in order to get it smooth with sand. I don't have a bottom drain and really don't need it with (5) returns and (2) skimmers.