Grout Today Plaster Tomorrow? Cure time in heat

poolremodelnewbie

Active member
May 30, 2020
34
Los Angeles
The waterline and bond beam grout got put in this morning (laticrete permacolor). It says 72 hrs at 70 degrees till fill.). The plaster company wants to plaster tomorrow so It would likely fill tomorrow afternoon about 33 hours later. How problematic is this? It 88 degrees today and tomorrow. Im assuming that the heat may speed up the cure time. Please advise. Thanks
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,667
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I don't think the air temperature will speed the cure time by that much.

If you want solid hard grout I would follow the Laticrete recommendations.
 

poolremodelnewbie

Active member
May 30, 2020
34
Los Angeles
Thank you for this!
"There is a simple rule to follow when an installation is subjected to high temperatures: The 18º Rule – for every 18ºF above 70ºF (10ºC above 21ºC), portland cement and epoxy-based materials take half as long to cure."
So its 88 degrees which is 18 degrees over 70. Therefore, the grout will take 36 hours to cure. Is this correct?If so I will be close to the time. I am hoping that that is good enough as overnight the temp. goes down.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,667
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Can we fill only to below the waterline tile? That would cover all of the plaster but leave the grout to cure longer?

Yes, you can.

You cannot turn on your pump and get water filtering until the water is halfway up the skimmer mouth. But letting the water sit for 24 hours should not create a problem. Just brush often so plaster dust does not stick to the plaster and harden.
 
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