Building a Baja Shelf in existing pool HELP

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Sambo87

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Mar 21, 2018
2
San Diego CA
Hello, I have a contractor remodeling my pool currently. We are adding a Baja from the first stair stretching it out 10 feet because the pool is pretty big and thought it would be a nice addition since we are redoing everything. I noticed that my contractor placed rebar for the Baja shelf and filled it with the concrete he broke around the pool. My concern is that instead of getting a concrete truck and pushing the concrete between the rocks(depth about 4 feet) he just placed 3-4 inch’s of concrete on top and told me he walked on it and pushed it down? Will this be strong enough to last 20 years? Is this way safe to be done.... everyone I have talked to in the past 2 days tell me NO.
Thank you for your advice in advance!
 
Hmm.... Were the people you talked with concrete experts? The strength comes from the rebar. The "filler" just fills large voids. Think of it as large aggregate which is used as a base anyway. When he applies the concrete it will seep into all of the voids to create a strong shelf. It would take a LONG time for 4 feet of concrete to cure as well. What is the warranty on the work? I don't think I would have a problem with this method. Did you take any pics of the work you could post?
 
I thought he was going to use a more "liquidy" concrete. Not sure how thick this was when he started but looking at the wet edge it looks pretty thick. My concern here is how well the concrete filled in the voids from the aggregate. How deep is that rubble layer? I think the way he did this the shell of the pool will remain watertight since he didn't break any of that up. So the only real concern is will the shelf crack at some point. My feeling is "probably not". But to allay your fears, I would suggest you run this by either a structural engineer or perhaps by another concrete person.
 
PoolGate said:
I thought he was going to use a more "liquidy" concrete. Not sure how thick this was when he started but looking at the wet edge it looks pretty thick. My concern here is how well the concrete filled in the voids from the aggregate. How deep is that rubble layer? I think the way he did this the shell of the pool will remain watertight since he didn't break any of that up. So the only real concern is will the shelf crack at some point. My feeling is "probably not". But to allay your fears, I would suggest you run this by either a structural engineer or perhaps by another concrete person.
Click to expand...

The rubble air passages & dry substrate are the big liabilities to the cure.
 
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