Hairline cracks in new grouted pool bottom

[LazyPoolGuy]

Hi All,

How concerned should I be about hairline cracks in a new grouted pool bottom, or is it typical? There are 3 hairline cracks, one down the centre of the slope between the shallow and deep end, and 2 opposite each other in the deep end on the sloped walls down from the steel walls. At the two locations in the deep end, if you hit the grout with your fist it feels a bit hollow underneath, so I'm wondering if some material settled underneath and the grout is thin there.

What should I be asking the PB? I assume this is something that could cause an issue after the liner is in and the PB is long gone?

Thanks for the advice!

 

[cowboycasey]

all concrete will crack.. how much have you been watering it? The more you water it the less it will crack but it will still crack... as for thin grout I am unsure...

 

[LazyPoolGuy]

PB didn't tell us to water it, didn't know that was a thing. They poured the grout just over 3 weeks ago. Still no liner due to delays. Is it still worth keeping water on it now? We're located in Ontario Canada.

Thanks.

 

[cowboycasey]

it is, the first 30 days it is curing the slower it cures the harder it gets..