Before installing LVP or laminate, identify the subfloor material, existing covering, flatness and moisture conditions. Shaw says many vinyl products can go over an existing floor only when the surface is flat, clean and in good condition, and points buyers to product-specific installation guides. Use the selected floor's instructions for the exact preparation and testing requirements.
Floor preparation is part of the flooring purchase. Before comparing LVP and laminate samples, identify the existing surface and ask how the chosen product’s installation instructions apply to that room.
Inspect the floor you have
Record whether the substrate is concrete, wood panel or an existing floor finish. Look for loose areas, cracks, water staining, soft spots, high edges, lippage at tile joints and abrupt height changes at doors. These observations help the installer identify which checks and repairs belong in the bid; they do not replace the product’s published tolerances.
| Existing surface | Questions to resolve before ordering |
|---|---|
| Concrete | Which moisture-test method does the flooring manual require? Are cracks, coatings, joints or low areas within the product’s limits? |
| Plywood or other wood panel | Does the surface feel secure and meet the product’s flatness and moisture requirements? Which repairs are included? |
| Tile or resilient flooring | Does the selected product permit installation over it? Are loose sections, grout joints, texture and added floor height acceptable? |
Use the exact product instructions
Shaw says the installation procedure depends on the type of vinyl floor selected and provides product-specific guides. It says many of its LVT and LVP products may be installed over existing flooring when the surface is flat, clean and in good condition. That is a Shaw example, not permission to cover every existing floor with every product.
Shaw also calls out subfloor preparation for both vinyl and laminate projects. Ask the installer to identify the exact installation guide and the allowed flatness tolerance, moisture-test method, temperature and underlayment conditions for your product and substrate. If readings or repairs fall outside those requirements, price the correction before choosing the finish floor.
Compare the preparation line in each bid
Request a written scope that separates removal and disposal from patching, grinding, leveling, moisture testing, underlayment, transitions and baseboard work. A low material quote can leave substantial preparation outside the installed price. Ask who is responsible for documenting substrate conditions and what happens if a concealed issue appears after removal.
For the material tradeoff after the subfloor is understood, compare LVP, laminate and engineered hardwood. For a soft floor and its cushion requirements, see carpet fibers and padding; for hard tile, compare porcelain and ceramic. Browse flooring guides.
Sources
Common questions
Can LVP go over existing tile?
Shaw says many vinyl products can go over existing flooring when the surface is flat, clean and in good condition. Check the chosen product's instructions for allowed surfaces, grout-joint treatment and any required preparation.
Does a concrete subfloor need a moisture test?
Follow the selected flooring's installation guide for its substrate and moisture-test requirements. Ask the installer to record the test method and results when testing is required.
Can underlayment fix an uneven floor?
Do not use underlayment as a substitute for required substrate repair. Ask which leveling or patching work is needed and whether the product permits the proposed underlayment.
What should a flooring installation quote include?
Ask for the product and installation method, removal and disposal, subfloor tests and repairs, underlayment, transitions, trim and any excluded work.