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re: No visqueen under carport slab
Posted on 2/12/18 at 3:50 pm to AlxTgr
Posted on 2/12/18 at 3:50 pm to AlxTgr
I’m not reading that. Are you saying that placing a vapor barrier under a slab doesn’t not thwart moisture on the surface? If so you’re wrong. ETA- feel free to read more here
LINK
This post was edited on 2/12/18 at 3:51 pm
1
Posted on 2/12/18 at 3:52 pm to JoePepitone
quote:
My carport has a very smooth finish and it sweats something horrible when conditions are right. My front porch has a rougher finish and doesn’t sweat anything close to the carport.
Question and answer:
Sweaty carport
quote:
I have a home with a carport. At this time of the year when the humidity is high and the temperature starts to fall, the concrete floor “sweats”. The entire floor is wet with puddles of water in places. Can this problem be solved?
Answer:
quote:
Enclose the carport and heat it and air condition it. I’m serious, it’s going to be the only answer and of course you’re not going to want to do that. A carport is notorious for this because a concrete’s cold, the fronts run through, it’s no different than that beer can or Coke can out by the pool, you got that cold surface, you got the hot warm air touching it and condensate forms. That happens with carports because they’re open and they don’t breath as well as the rest of the concrete so it’s going to sweat.
Posted on 2/12/18 at 3:53 pm to LSUballs
quote:It does nothing for surface condensation.
Are you saying that placing a vapor barrier under a slab doesn’t not thwart moisture on the surface?
quote:No, I am absolutely not.
If so you’re wrong.
Posted on 2/12/18 at 3:55 pm to AlxTgr
I would give up this argument if I were you. Posted on 2/12/18 at 3:56 pm to AlxTgr
I’m convinced mine is due to surface condensation. It was really bad this past Saturday. I picked up a 5-gallon bucket that was sitting out there and it was dry underneath it. Just can’t understand why the carport sweats so much more than the porch.
Posted on 2/12/18 at 3:58 pm to LSUballs
quote:Ironic post is ironic. Balls, this is super easy science.
I would give up this argument if I were you.
Posted on 2/12/18 at 3:59 pm to JoePepitone
quote:
I’m convinced mine is due to surface condensation. It was really bad this past Saturday. I picked up a 5-gallon bucket that was sitting out there and it was dry underneath it.
Boom.
Posted on 2/12/18 at 4:04 pm to AlxTgr
quote:
Fish bite when that happens as well.
I'm guessing you use a top water lure when fishing concrete
Posted on 2/12/18 at 4:05 pm to AlxTgr
quote:
WHAT ARE VAPOR BARRIERS? All of the problems associated with moisture vapor movement in a concrete slab will go away in time as the slab dries, as long as there is no source of additional water into the slab. Since the most common source is moisture in the ground beneath the slab, the solution is to completely take the ground out of the equation, by sealing the bottom of the slab.
LINK
quote:
A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the sub-grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete. 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.
LINK
quote:
Why are vapor barriers used under concrete you ask...Moisture that is in the ground slowly rises to the surface. This is problematic if you are putting tile or carpeting on top of the concrete in the way of flooring. Vapor barriers AKA vapor retarders are a sheet of plastic that blocks the water from reaching the concrete slab.
LINK
Posted on 2/12/18 at 4:05 pm to AlxTgr
quote:
It does nothing for surface condensation.
While I understand you are saying the moisture is coming from the surface and not the ground, I'm no engineer but its a pretty obvious idea that having a barrier between the concrete and the ground would help to keep the concrete warmer and thus have less likelihood to sweat from the air.
Posted on 2/12/18 at 4:07 pm to baldona
quote:Interesting take, but it's not going to help.
While I understand you are saying the moisture is coming from the surface and not the ground, I'm no engineer but its a pretty obvious idea that having a barrier between the concrete and the ground would help to keep the concrete warmer and thus have less likelihood to sweat from the air.
Posted on 2/12/18 at 4:10 pm to LSUballs
quote:Yes, that is absolutely true. Unfortunately, that's not what the OP is experincing.
Why are vapor barriers used under concrete you ask...Moisture that is in the ground slowly rises to the surface.
quote:
There are two possibilities that can cause your garage floor to be damp:
Two Balls...TWO!
quote:
When warm, humid air comes in contact with a cold concrete slab, water vapor in the air can condense on the surface of the concrete in the same way that a glass with ice sweats in summer. This usually happens more in the spring and early summer, since the ground temperature is still low and the air is warm and humid.
quote:
A vapor barrier may not have been installed under the slab when the concrete was poured. This can allow moisture from the ground to penetrate up through the concrete, resulting in damp conditions. If there are cracks in the slab and the drainage is poor, it may even cause ground water to seep up through the cracks and puddle on the floor.
Balls' world turned upside down!
Posted on 2/12/18 at 4:15 pm to AlxTgr
Man, I don’t have any idea what you are trying to argue. You said that water can’t pass from the ground, thru the slab onto the surface of the concrete. Which is flat out wrong. That is why vapor barriers are installed. To thwart the passage of moisture from under the slab, thru the slab, and onto the surface. This is a fact.
Posted on 2/12/18 at 4:16 pm to AlxTgr
My carport sweats so bad I’ve considered buying one of those tennis court squeegies.
The only reason I haven’t is that if I buy any more hardware I’ll have to build another storage shed.
The only reason I haven’t is that if I buy any more hardware I’ll have to build another storage shed.Posted on 2/12/18 at 4:19 pm to LSUballs
quote:No I did not.
You said that water can’t pass from the ground, thru the slab onto the surface of the concrete.
quote:Yes, that is. That has nothing to do with surface condensation.
To thwart the passage of moisture from under the slab, thru the slab, and onto the surface. This is a fact.
Posted on 2/12/18 at 4:20 pm to LSUballs
quote:Also true
Man, I don’t have any idea what you are trying to argue
Posted on 2/12/18 at 4:25 pm to AlxTgr
quote:
No I did not.
You did here
quote:
The surface has no idea whether or not there's visqueen under there.
The surface most certainly does. Slabs without a vapor barrier will exhibit much more moisture on the surface than those with a vapor barrier. This is common knowledge and what the OP was alluding to.
ETA- is your arguments that slabs can potentially sweat either way? Well no shite. But that doesn’t mean vapor barriers don’t work. They work very well
This post was edited on 2/12/18 at 4:28 pm
Posted on 2/12/18 at 4:43 pm to LSUballs
Alx is right, and your link to the Wagner site is specific to slabs where glue-down hardwoods will be applied. Your argument is sound, but not in the way you think it is. OP's issue is almost certainly from condensation.
A slab in conditioned space without a vapor barrier would definitely have a higher moisture content, but certainly no visible moisture or standing puddles (unless it was in a basement or well below grade with a high water table.)
A slab in conditioned space without a vapor barrier would definitely have a higher moisture content, but certainly no visible moisture or standing puddles (unless it was in a basement or well below grade with a high water table.)
Posted on 2/12/18 at 4:54 pm to halleburton
quote:
Alx is right,
quote:
A slab in conditioned space without a vapor barrier would definitely have a higher moisture content,
Well which is it? He said visqueen doesnt do anything. Which is wrong and has been my only argument. Look at a slabs with and without vapor barriers and get back to me. Or better yet don’t. I’m retiring from this absurd thread. 
Posted on 2/12/18 at 5:00 pm to LSUballs
I haven't read all your back and forth, but lack of a moisture barrier would not lead to standing water or puddling. Obviously a vapor barrier does something, otherwise it wouldnt be required by building codes for habitable spaces. Ya'll are both right, and also arguing different points.
This post was edited on 2/12/18 at 5:01 pm
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