ohmm,
That is very bad news.
The water is coming up from under the ground?
Call a wall proofing specialist to get the bad news, but to see what he suggests.
That is VERY bad news.
Good Luck to you.

It is possible that the dark spots are condensed moisture in which the floor is cooler than is the air in the garage. But even that indicates that the floor is not likely to have vapor barrier under it.

Found a few products which may be useful in this situation.

Would require clearing the garage of everything and power washing with a cleaning solution and lots of rinsing. Then applying the moisture block.

Would have to rent a PODS storage unit for the driveway for a week to get it done.

http://www.aquron.com/our-products/concrete-protection-and-waterproofing/aquron-moisture-vapor-block/

http://www.chem-crete.com/products/details.aspx?CategoryID=2&ProductID=5

If moisture is coming up through the slab I would be concerned about it rotting out the bottom of your wall framing... I will hope that it's not fully drywalled so that you can see it. Houses are typically built with PT sills, but with enough water it will wick up into the studs and shear panels, and being this was a DIY project...

This post was edited by mosquitogang201 on Sun, Aug 10, 14 at 17:21

I am guessing the garage was built by the homeowner somewhere around '79/'80 or so.

I think the problem will be significantly lessened if I apply one of those above mentioned sealers.

The bottom plates, I don't know. The prior owner to me, lived here for 31 years. He added the OSB and insulation at some point. I have not removed any OSB yet to have a look.

This is the garage outer wall. Has the raised section the wall sits on. The sealant on the floor is all around the perimeter outer wall.

Just to the right of the garage overhead door.

Entry to house. When you walk in, the main entry door is immediately to the left, and to the right is a closet.

Salt damage I am guessing.

This is what the moisture in areas looks like shortly after it has rained. Shows up in various areas around the garage floor. Usually the same general areas each time.

Last upload posted twice somehow. Deleted the one.

This post was edited by ohmmm on Sat, Sep 20, 14 at 0:49

So what Bad Thing is happening as a result of some moisture on/in the floor? If your sills are going to rot no sealer will prevent that from happening, when they get too bad replace them with PT lumber. Generally sealers you put on the dry side of any surface don't accomplish much other than to trap the moisture and eventually lift off.

It would have to be creating some horrible problem for me to want to jackhammer the floor out (or even invest a couple hundred bucks in an attempt at sealing). My garage floor is wet all winter in any event from melting snow dripping off the cars. If you are storing a valuable antique car I'd put down PT sleepers and 2x6 PT decking to get it up off the concrete with some air circulation underneath. Otherwise I'd ignore it. I can't imagine what makes it VERY BAD news.

It's a problem because I spend quite a bit of time working in the garage on various projects though the year including working on my vehicles. And I prefer not to be in a cold damp environment while doing so.

The sealers in question are penetrating sealers. Not coatings that sit on the surface.

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. To reduce the problem, you could Rough up the surface of the concrete by applying a concrete cleaning/etching solution and apply an epoxy or any surface coating after implementing the water vapor barrier to provide better traction.

Did you ever find the cause of the wet garage floor?
Or a fix?