If it comes up just a dark spot or dry then use a regular padding.
Carpet paddling installed plastic side up or down.
Depends on the padding but the smooth or shiny side up.
Learn all about laying carpet underlay correctly so that it preserves the life of the carpet feels great underfoot and does not ruck up causing ridges and gaps.
Some carpet paddings have a webbing or moisture barrier coating on one side.
If the moisture barrier goes against the concrete do i still tape the red side then try to flip over the other side is like padding and i don t think the tape would stick to it.
If its damp w definite moisture i d re consider having carpet at all to save time and money in the long run.
Make sure the two white sides are as close as they can be and lay one over the other and tack it down.
As you unroll each roll the clear plastic end lies on top of the end with adhesive strip and two white pieces of foam will be butted up against each other.
The red side is the moisture barrier which i installed facing up.
I can t see how it would hurt either way provided you don t over.
If you re installing over wood floors the moisture barrier goes up to prevent spills from soaking into the padding.
Simple duct tape a pc of foil down for a 24 hr period.
This side goes up this allows the carpet to move across it naturally as you install the carpet and unless you have a kid and pet proof or rubber padding all pad will let spills go right to the floor gl.
There s just not enough flat bottom to ride right side up.
Then install the carpet to the vinyl floor piece by piece by bringing it back through the doorway and laying it down in front of you so you have something to walk on.
Carpet should be expected to last at least 2 3 years up to about 7 10 years but it can last for decades if it is good quality carpet with a good quality padding installed correctly and well.
Additional information for better results you can use a carpet pad under the carpet.
Some have like a netting type side.