FAQ: How To Lay Underlayment On Concrete?

Can you put underlayment on concrete?

With a concrete subfloor, you will need an underlayment that acts as a vapor barrier in order to prevent moisture from penetrating through to your laminate installation. The normal choice is a thin foam pad material made of polyethylene or polypropylene, which rolls out in sheets.

Does underlayment need to be glued down?

No, you should not glue down your underlayment. Underlayment is is a floating material, the same as your laminate flooring. In most cases, you should not glue or nail your underlayment down. You should always check with the installation instructions of the underlayment for proper installation instructions first.

How do you attach plywood underlayment to concrete?

To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. Use a ¾” spacer between the plywood and the wall and a 1/8” spacer between panels. Next, lay a second layer of plywood at a 45-degree angle to the first layer.

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How do you install laminate flooring over concrete?

Begin installation by laying a plastic vapour barrier (minimum 6 mm thick) or any other manufacturer-recommended barrier on the concrete subfloor to prevent moisture from reaching the laminate flooring. Use vinyl tape to secure the barrier and keep it from coming out.

What can I put under vinyl flooring on concrete?

If you have any areas on a concrete subfloor with moisture concerns, it is recommended to use a vapor barrier underlayment that will not add any cushion to the planks. For click lock vinyls over 4mm, you’ll want to choose an underlayment specific to a vinyl floor, such as our Perfect Mat Underlayment or Floor Muffler.

Is underlayment the same as moisture barrier?

Sometimes the underlayment is already attached for you, but you may hear the term moisture or vapor barrier when installing laminate flooring. You will need a moisture barrier underlayment when installing: On a cement subfloor. On any subfloor that has a chance of moisture coming up and soaking into the flooring.

Should you glue a floating floor?

Floating laminate floors are not intended to be glued down. Floating laminate floors can move with temperature, and gluing down the planks can damage them. If installing in a wet area, like a bathroom, you should glue the laminate planks to seal the tongue and groove seams from moisture.

Can you use duct tape underlayment?

The answer is no. We recommend to use duct tape as every hardware store carries this product. Some manufacturers sell specialized tape for underlayment but there is no extra benefit.

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Do you nail down underlayment?

To nail down the plywood, use underlayment nails, which have a smaller head and rings on the nail shank that prevent them from working loose. Drive nails throughout the entire sheet of plywood, every 6 to 8 inches (see illustration on next page), to ensure the floor is down solidly.

Can you put plywood over concrete?

If you‘re installing plywood over an existing dry concrete floor, you shouldn’t have any problem. However, a new concrete floor contains a lot of moisture. So, you need to allow it to cure for at least 60 days before even bothering to check the moisture level.

Do you need a subfloor over concrete?

While a subfloor is not necessary to add structural strength when you‘ll be laying finish flooring on top of a concrete slab (as in a basement remodel), subflooring over concrete offers two other advantages: A subfloor will help insulate against a concrete floor that becomes overly cold in winter.

What kind of plywood do you use for subfloor over concrete?

Wood structural panels suitable for use as subflooring material should be plywood or oriented strand board (OSB) with a bond classification of Exposure 1 or Exterior.

What’s the best underlay for laminate on concrete?

Best underlay for laminate flooring is foam because it is simple to install, it is a good sound barrier, and is very cost effective. Some best foams have attached additional layer which functions as the best moisture barrier. Best foam which can be attached to laminate also insures that floor is not so cold.

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What is the best flooring to put over concrete?

Best Flooring for Concrete Slab Foundation

  1. Engineered Wood. Natural hardwood flooring offers undeniable beauty and durability.
  2. Vinyl. As a longstanding choice for kitchens and bathrooms, vinyl has a reputation for extreme water resistance.
  3. Laminate.
  4. Carpet.
  5. Tile.

Do you need to seal a concrete floor before laying laminate?

You don’t need to seal a concrete floor before installing laminate; however, to prevent moisture from the concrete floor from affecting your laminate, install a vapor barrier of polyethylene film. Install this barrier even if the concrete subfloor is covered by vinyl, linoleum, terrazzo or ceramic tile.

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