We wanted to go over how to fasten underlayment to your subfloor in this article. Before starting, we recommend you to read your flooring underlayment installation instructions.

Two Different Ways to Fasten Underlayment to Subfloor

Floating Underlayment

Most flooring underlayment is installed floating on top of your subfloor. Installers usually lay the underlayment on the floor and start installing the laminate flooring on top. There is no fastening the underlayment to the subfloor.

However, during installation some installers like to fasten underlayment to the subfloor to prevent the underlayment from moving. If your choose this route, staples are a good choice to fasten the underlayment. Staples usually have a coating which help increase the holding power.

Crown Compression Stapler

Using a crown compression stapler, staple 2 inches on the seams and edges with 4-6 inches apart in the middle.

How To Fasten Underlayment To Subfloor

Glue-Down Underlayment

If your flooring is a glue-down flooring installation type, please refer back to your flooring manufacturers installation instructions on what they recommend for glue.

Some examples of glue in the flooring industry is Bostik’s BEST Urethane Adhesive or DriTac 5900 MegaBond.

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  • All wood and concrete subfloors must be flat within 1/8″ over a 6′ span, or 3/16″ over a 10′ span. All areas must be checked prior to installation.

    Installation Instructions

    1. Be sure the subfloor surface is clean and dry*.
    2. Roll QuietWalk Underlayment over the subfloor with the vapor barrier film (imprinted side) facing up.
    3. The perimeter edges of QuietWalk Underlayment need to be 1/2 to 3/4 inches away from the wall.
    4. Seams need to be butted together flush, do not overlap the pad. Tape the seams with duct tape, unless the roll is provided with a factory attached lip and tape system. 5. Install laminate flooring according to the manufacturer’s installation instructions.

    * In geographic areas where concrete slabs are subject to excessive moisture, a calcium chloride moisture test is required. Vapor emission readings in excess of 5 lbs. per 1,000 square feet in 24 hours will require additional protection such as a concrete sealant or polyethylene sheeting.

    NOTE: All rolls of QuietWalk Underlayment are cut to a minimum of 100 square feet. The average thickness of QuietWalk Underlayment is .125 of an inch. The average weight of a roll is 12 lbs.

    Due to the nature of our manufacturing process and the use of recycled materials, the pad thickness may vary .02 of an inch plus-or-minus. Actual weight of each roll may also vary 1.2 lbs. plus-or-minus. While it may appear that one roll is slightly larger than another, we guarantee this slight variance DOES NOT affect the coverage area nor the sound absorption benefits of the product.

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  • 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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