Plaster Chip

[jontomosicz]

Not sure where to post this. Just found a big chip of plaster had come out of the bottom of my pool. Pool was built last Sepetember. Haven't seen any other problems, but this really concerns me.

See attached pics.
The second pic shows a rounded indentation in the bottom of the chip. I see a big black spot in the bottom of the pool that looks like a rock or something. I wonder if that caused it to come loose. Pics of the bottom of the pool didn't come out well.

Any ideas?

Chemistry
FC: 4.5 (a little low for my CYA...haven't add chlorine in a few days)
CC: 0
PH: 7.7 (usually keep this between 7.6 and 7.8)
TA: 60 usually keep this at 60-70
CH: 475
CYA: 40
Temp: 52

 

[Jimrahbe]

Jon,

Welcome to TFP.. A Great resource for all your pool questions...

Your PB should be able to patch that without any trouble at all and under warranty..

Sorry, but I have no idea why it would have come loose.

Jim R.

 

[jontomosicz]

Thanks Jim.

How do my numbers look?
Would poor chemistry cause a large piece of plaster to chip off, or is it more likely an installation issue/anomaly?

Thanks,
Jon

 

[bdavis466]

That's an installation error. No doubt about it

 

[Jimrahbe]

Jon,

Your numbers look perfect to me. I doubt anything you could do, chemistry wise, would cause that chip issue..

Jim R.

 

[bdavis466]

Is this a Shotcrete pool? The rock you are referring to looks a the size of the aggregate used in Shotcrete mixes. If that's the case then it looks like the plaster was applied very thin in that area.

Can you see the shell in the area where the chip came out or is the pebble finish still present?

 

[jontomosicz]

Is this a Shotcrete pool? The rock you are referring to looks a the size of the aggregate used in Shotcrete mixes. If that's the case then it looks like the plaster was applied very thin in that area.

Can you see the shell in the area where the chip came out or is there still the pebble finish present?

Yes, shotcrete. Finish is pebble tec sheen.
I'll contact the pb in the morning.

 

[jontomosicz]

And yes I still see the plaster in the chipped out area. There's a black rock in the middle. Doesn't look like the typical rocks in pebble tec.

 

[JamesW]

In the bottom picture, you can see the indentation of the rock in the center of the chip. Probably a rock from the gunite that was sticking up. Probably related.

Maybe when they were trowelling the plaster, they hit the rock and scraped out the plaster to see if they could remove the rock. Perhaps the couldn't get the rock and just filled over it.

Maybe the trowel was prevented from compressing the plaster because it was deflectedby the rock.

 

[jontomosicz]

In case anyone was curious... The plaster company checked out the divot in the pool floor today. That "rock" was actually a seed. He said they see this pretty often. The wind will blow a seed into the mixture and it gets applied without anyone noticing. They patched the divot, and it looks like new.

 

[Jimrahbe]

Jon,

That sounds perfect!!!

Thanks for the feedback.

Jim R.