Gunite install in the winter

Pibkac

Member
Oct 23, 2019
7
Nj
I’ve been reading lots of info about watering the gunite to slow down the curing process, but it seems to mostly apply to the summer months or warmer climates. Here in the north east the temps have been low 30s at night and 50s during the day.

Our pb spayed the Gunite a few days ago and covered it with the plastic. We asked about watering it but they seemed to have been on the fence to leave the plastic cover and not water or remove plastic and rain/water it. I can see some moisture buildup under the plastic sheet, but not everywhere. Should we remove plastic to be safe? It’s been a few days under the plastic already, is it too late anyways?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,941
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Most of the benefit to watering new gunite happens in the first 3-4 days. With all the rain we are getting the gunite is getting naturally watered. For the first 14 days it does not hurt anything to peel back the plastic and pour some water on the gunite if you see it dry and then cover it back with the plastic.

 

Pibkac

Member
Oct 23, 2019
7
Nj
Thanks for the comment. We opened up the plastic and sprayed the gunite a bit, but with this wind, it’s a tough job.

It might get below 30 tonight, should we cover it back up with the plastic?
Would the rain/freeze cycle damage gunite?
What about just leaving it uncovered from now on?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,941
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Keep new concrete covered in cold weather. The concrete generates heat during the curing. The plastic gives it some thermal insulation and keeps the concrete warm. Put some rocks or bricks or whatever on the plastic to hold it down. The heat generated from the curing with a blanket over it should keep the concrete from freezing even if the temp drops a bit below freezing.

You might want to read this...

 

Pibkac

Member
Oct 23, 2019
7
Nj
Thanks for the tip, we covered the pool back up with plastic. I’m not looking forward to doing the uncover/water/cover twice a day for the next week :(
 

jimmythegreek

TFP Expert
Bronze Supporter
In The Industry
Aug 10, 2017
3,555
Morris Cnty NJ
Dont worry about watering it at this point. With plastic over it the warmth and condensation will naturally help it along. Warm months need it with temps dropping below freezing I'd leave it be naturally
 
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Pibkac

Member
Oct 23, 2019
7
Nj
Thanks! I’m guessing if I leave it I’ll be fine and if I spray it, it might marginally help, but not enough to make a huge difference. FYI When we took the plastic off, I noticed that the bottom was moist, but the top/sides were dry which initially got me worried.
 
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