Basement floor slab poured, now frost days.

  • Erstellt am 2022-12-11 09:18:31

Smeagol

2022-12-11 09:18:31
  • #1
Hello everyone,

on Friday noon the base slab for the basement was poured. From Friday to Saturday it was already close to the freezing point. From Saturday to Sunday now definitely below the 0-degree mark. We haven't measured inside the pit itself, but are currently unsure if that's okay. The coming days are also forecasted to be around minus 2-3 degrees at night. The slab has been covered with a foil since Friday.

Should one be worried about that? How should one behave towards the general contractor regarding this?

Thanks and best regards
 

SoL

2022-12-11 09:31:58
  • #2
I know it this way: the base slab may be poured up to 5 degrees and it must not freeze afterward until the concrete has cured. I would note the concerns in writing to the [GU] with the temperatures of the respective days in your place.
 

WilderSueden

2022-12-11 09:41:57
  • #3
The first days are critical, after that it can sometimes freeze through. When setting, the concrete generates heat; if it is covered (just foil or fleece plus foil?), 2-3 degrees below zero is rather not a problem. It just takes significantly longer for the concrete to cure.

I would still recommend politely addressing this with the general contractor by email, but in case of doubt, it would already be too late now.
 

Smeagol

2022-12-11 10:57:59
  • #4
Thank you very much! In my opinion, the sheet is without insulation. So just a normal tarp. The general contractor and shell builder are regionally experienced companies here. I will do as you write and ask politely. If there is damage, can a layperson recognize it? On the internet, there is something about lens-shaped formations.
 

xMisterDx

2022-12-11 16:11:49
  • #5
You can save yourself the trouble of asking the GU. They will tell you it’s not a problem because xyz and it has often been done that way before. And if there are cracks, it’s their problem.

No matter what I asked... why the foil on the floor slab was blown away by the wind after just 3 hours, whether you should pour an intermediate ceiling in pouring rain, whether it’s a good idea to apply the exterior plaster just before night frost... there was always an answer like that :D

What else is the GU supposed to say? If they assumed it was problematic, they wouldn’t do the work.
 

SoL

2022-12-11 16:20:02
  • #6
It is more about securing evidence for possible issues. He can certainly write that everything is I.O. and common practice. However, if it comes to a dispute, there is a written proof.
 

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