If it collects moisture on the top of the plastic you must reduce the humidity in the basement before putting down carpet.
Laying carpet on a concrete floor.
Putting carpet directly onto sub floor especially concrete slab is a commercial application.
The padding should cover the entire floor but should not overlap.
Tape the seams together using duct tape but do not add flooring adhesive anywhere by the perimeter of the room.
As well as potentially absorbing moisture from underneath if the air is humid the carpet could be exposed to additional pockets of dampness which could rot your carpet quickly.
How to install carpet on a concrete floor.
This will hold the carpet padding in place as you install it.
You can do it in a residence but its not done because its not comfortable.
Concrete screeds should be structurally sound and not contain holes chips or cracks.
Using the power stretcher stretch the carpet across the room to the opposite wall.
One of the biggest challenges in laying carpet on concrete is the degree of moisture that your carpet might be exposed too.
Tile is laid on thin set directly on sub floor.
Continue this until the carpeting is smooth and flat.
Its called direct glue down.
Lay carpet out and use a rented knee kicker to force the carpet into the far corner.
As well as potentially absorbing moisture from underneath if the air is humid the carpet could be exposed to additional pockets of dampness which could rot your carpet quickly.
Tape a piece of transparent plastic on the floor.
Residential broadloom carpets should be laid on carpet pad and its for comfort.
Lay carpet grippers down 1 2 inch from the base of the wall.
Pour a bit of underlayment adhesive around the perimeter of the room.
Screed must be as dry as possible before laying carpet down to avoid mould from forming due to rising moisture.
Carpet tiles are another story.
Once dry the screed should then be cleaned and free from contaminants such as oils grease or polish for example.
If it collects moisture on the concrete side you need to find the source of the water and solve it landscaping around the house sump pump etc.
Do not place the grippers at doorways or thresholds because the nails could poke through the carpet and hurt your feet.
They are vinyl backed and designed to.