Flooring contractors glossary

Short, plain-English definitions of the terms you'll meet when choosing a flooring contractor provider in Tampa Fl.

What is a moisture barrier (vapor barrier)?: A moisture barrier is a plastic sheeting material, typically polyethylene, installed between concrete slabs and flooring to prevent groundwater and moisture vapor from damaging wood and laminate floors.
What is a PEI rating?: The Porcelain Enamel Institute (PEI) rating is a standardized 0-5 scale that measures the surface durability and wear resistance of porcelain and ceramic tiles based on their ability to withstand foot traffic.
What is a subfloor?: A subfloor is the structural layer installed directly over floor joists or concrete that supports and provides a stable base for finish flooring materials.
What is a wear layer?: A transparent protective layer on the surface of luxury vinyl plank (LVP) and laminate flooring that resists scratches, stains, and foot traffic damage.
What is AC rating (abrasion class)?: AC rating is a European standardized abrasion class scale (AC1 to AC5) that measures how well laminate flooring resists surface wear and foot traffic, with higher numbers indicating greater durability for heavier-use environments.
What is an expansion joint?: An expansion joint is a deliberate gap left between flooring materials or at perimeter walls to accommodate natural expansion and contraction caused by temperature and humidity fluctuations.
What is an uncoupling membrane?: An uncoupling membrane is a flexible polyethylene or polymer sheet installed between the subfloor and tile to absorb movement and prevent tile cracking caused by substrate shifting.
What is click-lock flooring?: Click-lock flooring uses interlocking tongue-and-groove joints that snap together to form a floating floor system without adhesive or nails, commonly found in laminate and luxury vinyl plank applications.
What is concrete moisture testing?: Concrete moisture testing is a pre-installation inspection using standardized methods like calcium chloride tests or relative humidity probes to measure moisture levels in concrete slabs and determine if they meet flooring manufacturer specifications.
What is engineered hardwood?: Engineered hardwood is flooring made from a plywood or high-quality core topped with a thin layer of real hardwood veneer, designed to resist warping and cupping in humid climates.
What is floating floor installation?: Floating floor installation is a flooring method where planks or tiles interlock and rest freely on the subfloor without being glued or nailed down.
What is glue-down installation?: Glue-down installation is a flooring method where planks or tiles are permanently bonded to the subfloor using adhesive rather than mechanical fasteners or a floating system.
What is grout haze?: Grout haze is a thin, cloudy residue of dried grout particles and cement dust that settles on tile surfaces during and after the grouting process.
What is grout sealer?: A liquid protective coating applied to grout lines that hardens to create a barrier against water, oils, and dirt penetration.
What is luxury vinyl plank (LVP)?: Luxury vinyl plank (LVP) is a rigid or semi-rigid multi-layered synthetic flooring material that mimics the appearance of hardwood or stone and is installed as individual planks or tiles.
What is nail-down installation?: Nail-down installation is the traditional method of securing solid or engineered wood flooring planks directly to a wood subfloor using nails, cleats, or staples driven at angles through the tongue.
What is rectified tile?: Rectified tile is ceramic or porcelain tile that has been mechanically finished to uniform, perfectly square edges, allowing for minimal grout spacing and a more seamless appearance.
What is self-leveling compound?: A cement-based, pourable mixture that automatically flows across uneven subfloors and hardens to create a flat, level surface for flooring installation.
What is solid hardwood flooring?: Solid hardwood flooring is milled from single planks of hardwood species such as oak, maple, or hickory, manufactured as complete floor boards that run the full thickness of the finished floor.
What is SPC flooring?: SPC (stone plastic composite) flooring is a rigid-core vinyl product with a dense mineral-filled core layer that provides durability, dent resistance, and waterproof performance superior to softer vinyl types.
What is the Janka hardness scale?: The Janka hardness scale is a standardized test that rates wood species on their resistance to denting and wear, using a numerical score that helps contractors and homeowners evaluate flooring durability.
What is thinset mortar?: Thinset mortar is a cement-based adhesive mixed with water and sand that bonds tile to substrates in a thin, uniform layer, offering superior durability compared to mastic.
What is underlayment?: A thin material installed between the subfloor and finished flooring that provides cushioning, sound absorption, and moisture protection depending on the flooring type.
What is WPC flooring?: WPC (wood plastic composite) flooring is a rigid vinyl-backed product that combines wood fibers, plastic, and a polyurethane or vinyl core layer to create a water-resistant, durable floor suitable for any room including basements and bathrooms.