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Started By
Message
re: No visqueen under carport slab
Posted on 2/12/18 at 6:15 pm to LSUballs
Posted on 2/12/18 at 6:15 pm to LSUballs
quote:For OP's problem which is surface condensation. Visqueen prevents diffusion which is moisture moving from down to up. That's not what is going on in our carports in winter.
He said visqueen doesnt do anything.
1
Posted on 2/12/18 at 8:16 pm to AlxTgr
I am simple
When it is a high humidity in the winter my garage is slick with condensation
I don’t think moisture is picking those particular days to shoot up thru my concrete.
When it is a high humidity in the winter my garage is slick with condensation
I don’t think moisture is picking those particular days to shoot up thru my concrete.
Posted on 2/12/18 at 8:41 pm to tigerfoot
quote:It really is that simple.
I don’t think moisture is picking those particular days to shoot up thru my concrete.
Posted on 2/12/18 at 11:05 pm to AlxTgr
quote:
It really is that simple.
Yep. He may or may not have a vapor barrier, but for a slab on grade, a moisture issue from the underlying soil would manifest itself via capillary action/wicking(and efflorescence), rather than hydrostatic pressure. If it was a basement below grade, it would be different.
It's surface condensation, quite simply.
Posted on 2/13/18 at 7:24 am to AlxTgr
AlxTgr is correct. I’m in the business of preventing condensation.
There is no real solution for the OP other than enclosing and conditioning it. Might get a big fan or two and keep the air moving above the surface if it bothers you that bad. Perks of living in the South.
Once the concrete temp gets above dewpoint, the moisture will disappear. Our problem in the South as others have pointed out is cold weather followed immediately by warm, humid days. The concrete stays colder than the surrounding air much longer, well below the dewpoint temp., and it condensates.
I’ve been in new construction concrete buildings (before they were enclosed) and it literally be raining from the concrete above.
There is no real solution for the OP other than enclosing and conditioning it. Might get a big fan or two and keep the air moving above the surface if it bothers you that bad. Perks of living in the South.
Once the concrete temp gets above dewpoint, the moisture will disappear. Our problem in the South as others have pointed out is cold weather followed immediately by warm, humid days. The concrete stays colder than the surrounding air much longer, well below the dewpoint temp., and it condensates.
I’ve been in new construction concrete buildings (before they were enclosed) and it literally be raining from the concrete above.
Posted on 2/13/18 at 7:58 am to Mohican
quote:
AlxTgr is correct
Correct about what? Moisture getting on the surface of concrete, and every other surface, due to humidity, dew points, barometric pressure and condensation? Who is disputing that? My sole point of contention was him point bland saying that a vapor barrier under the slab would have no effect on the surface of the slab. And calling the idea an “old wives tale”. Which is factually incorrect. Reread the thread.
Posted on 2/13/18 at 8:06 am to LSUballs
In the OP's specific situation a vapor barrier would do nothing.
Posted on 2/13/18 at 8:37 am to halleburton
a vapor barrier under a concrete slab is only indicated for an enclosed space. why everyone is arguing about this i cannot comprehend
Posted on 2/13/18 at 8:41 am to LSUballs
quote:It will have no effect whatsoever. The wive's tale is exactly what's playing out here. People see moisture on their carport and say, "Ah, no visqueen". That's the wives tale. Been hearing it since I was a child. Visqueen does nothing at all for surface condensation that the OP and a lot of us are experiencing. frick Balls, you're better than this.
My sole point of contention was him point bland saying that a vapor barrier under the slab would have no effect on the surface of the slab. And calling the idea an “old wives tale”. Which is factually incorrect. Reread the thread.
Posted on 2/13/18 at 8:54 am to AlxTgr
quote:
Basically, everything that cools at night experiences sweating slab syndrome.
Even grass has sweating slab syndrome. It’s science.
Posted on 2/13/18 at 9:05 am to AlxTgr
I’m not spending day 2 knighting for the need of moisture barriers on the internet. And frankly can’t believe I did on day one. But all my statements in this thread have been factual. Whereas you’re batting about 70%. Tonite I shall sleep as champion. In parting:
Slab on top of Earth= Surface moisture
Slab on plastic sheeting on top of Earth= Less surface moisture
This post was edited on 2/13/18 at 9:06 am
Posted on 2/13/18 at 9:23 am to LSUballs
quote:
LSUballs
You sure have proven how stubborn and dumb you are in this thread.
Posted on 2/13/18 at 9:23 am to LSUballs
quote:No
But all my statements in this thread have been factual. Whereas you’re batting about 70%. Tonite I shall sleep as champion.
You made poor assumptions and probably figured out too late you were wrong. Sucks when it happens, but it does. The visqueen lie has been around a while and will die very very slowly.
As others have said, the vapor barrier issue is totally different that the surface moisture issue. You're really batting about 10%. As you said to others, go back and read.
You will toss and turn tonight and maybe even make an Alx voodoo doll.
Posted on 2/13/18 at 9:25 am to LSUballs
quote:BTW, this is still wrong. I'm betting you've never actually encountered diffusion.
Slab on top of Earth= Surface moisture
Slab on plastic sheeting on top of Earth= Less surface moisture
Posted on 2/13/18 at 9:40 am to Lsutmorg
wait do you think that visqueen under a slab is going to prevent moisture from coming up through the concrete
Posted on 2/13/18 at 9:42 am to CarRamrod
Here
we
geaux
we
geaux
Posted on 2/13/18 at 9:46 am to LSUballs
quote:It can minimize....... it will never eliminate.
Many moisture problems associated with interior concrete floors and slabs on grade can be minimized or eliminated by installing a vapor barrier under the concrete.
Posted on 2/13/18 at 9:47 am to AlxTgr
quote:what is the argument here?
Here
we
geaux
Posted on 2/13/18 at 10:49 am to CarRamrod
quote:Whether or not a layer of visqueen under a slab will prevent surface moisture.
what is the argument here?
Posted on 2/13/18 at 11:05 am to AlxTgr
This thread is like a brain fart put into words. Damn.
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