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2. Self-leveling concrete - Wikipedia

   en.wikipedia.org/wiki/Self-leveling_concrete

   In the category of self-leveling concrete there are two main groups of materials: underlayments and toppings. An underlayment is installed over an existing subfloor to smooth it out and correct any surface irregularities prior to the installation of all types of floor coverings, including sheet vinyl, vinyl composition tile (VCT), wood, ceramic tile and carpet.

3. Gypsum concrete - Wikipedia

   en.wikipedia.org/wiki/Gypsum_concrete

   Gypsum concrete is a building material used as a floor underlayment used in wood-frame and concrete construction for fire ratings, sound reduction, radiant heating, and floor leveling. [1] It is a mixture of gypsum plaster, Portland cement, and sand. [1]

4. Laminate flooring - Wikipedia

   en.wikipedia.org/wiki/Laminate_flooring

   Improper installation can result in peaking, in which adjacent boards form an inverted V shape projecting from the floor, or gaps, in which two adjacent boards are separated from each other. Installation of laminate flooring – note underlay to allow for contraction, expansion, and moisture control and method for squaring and distancing from wall.

5. Underlay - Wikipedia

   en.wikipedia.org/wiki/Underlay

   In vinyl flooring or "linoleum", the underlay is the thin layer of plywood that is fastened over the structural subfloor to create a uniform, smooth platform for the sheet vinyl. For laminated wood flooring, the underlay provides a “vapor barrier” to prevent moisture from coming through the floor of the home and then migrating into the ...

6. Flooring - Wikipedia

   en.wikipedia.org/wiki/Flooring

   Flooring is the general term for a permanent covering of a floor, or for the work of installing such a floor covering. Floor covering is a term to generically describe any finish material applied over a floor structure to provide a walking surface.

7. Underlayment - Wikipedia

   en.wikipedia.org/wiki/Underlayment

   Underlayment may refer to: Underlay, a material placed underneath floor carpet, other flooring materials, or mattress bedding; Underlayment, a water-resistant or waterproof layer used beneath many types of commercially available roofing material. Bituminous waterproofing, systems designed to protect residential and commercial buildings