Interior Flooring Manual
Should Lonseal flooring still be chosen for installation over an existing floor covering, the following requirements must be met: The existing floor covering must be a single layer of non-foam backed, resilient flooring that is fully and securely bonded (not perimeter bonded) to an approved, “as new” substrate (refer to Substrate Repair on page 4). The existing floor covering must be prepared sufficiently to provide a smooth surface for installation. The existing floor covering must be compatible with the adhesive being used for the new installation. If the subfloor is concrete, it must still be tested for moisture and alkalinity (refer to Concrete Slabs on page 4). The installation must meet all other criteria noted throughout this manual. Compatible, existing floor coverings can include: ceramic tile, epoxy paint, linoleum, marble, sheet vinyl, SVP (LVP), SVT (LVT), terrazzo, urethane coating, or VCT. Incompatible floor coverings include, but are not limited to, rubber or asphalt surfaces. An existing floor covering should always be considered a non-porous surface, unless a self-leveling underlayment with a minimum thickness of 1/4 in. (6.4 mm) is used. Refer to Self-Leveling Underlayment on page 10. Disclaimer: There is an increased likelihood of indentation when installing over an existing floor covering, especially from commercial fixtures, hospital beds, and equipment. Telegraphing of existing floor coverings through the surface of the new flooring is possible over time and should be expected. Disclaimer: Lonseal makes no guarantee of the compatibility between Lonseal flooring and the existing floor covering. It is up to the installer to confirm compatibility. It is highly recommended that the manufacturer of the patching compound or self-leveling underlayment be contacted for their recommendations, and to perform a bond test (refer to Bond Tests on page 10). The following information is provided as the best possible suggestion to prepare an existing floor covering to receive Lonseal flooring. Repair or replace damaged or missing tiles, and eliminate gapped seams. Completely remove dirt, coatings, or other surface treatments. Sand (non-asbestos) flooring to remove all traces of wax or contaminants, to knock down rough edges, and to provide a suitably abraded surface for optimal bond. Smooth and fill any surface imperfections with an approved patching compound or self-leveling underlayment. Always check with the underlayment manufacturer to confirm which product is most suitable for this type of installation, and confirm the use and type of primer. Refer to Patching Compounds on page 9. Existing Resilient/Adhered/Tile Floor Covering Preparation:
Existing Fluid-Applied Coating Preparation:
Ensure the coating is well bonded, and remove loose and scaly areas. Abrade with 60 grit sandpaper.
Smooth and fill any surface imperfections with an approved patching compound or self-leveling underlayment. Always check with the underlayment manufacturer to confirm which product is most suitable for this type of installation, and confirm the use and type of primer. Refer to Patching Compounds on page 9. Existing Marble/Terrazzo Preparation: Sand or grind the surface to ensure complete removal of any sealers or coatings, and to provide a suitably abraded surface for optimal bond. Smooth and fill any surface imperfections with an approved patching compound or self-leveling underlayment. Always check with the underlayment manufacturer to confirm which product is most suitable for this type of installation, and confirm the use and type of primer. Refer to Patching Compounds on page 9. Patching Compounds Portland cement-based products may be used for smoothing and filling indentations, holes, and minor cracks on commercial projects and for all applications over concrete or wood subfloors. These products must have a minimum cured compression strength of 3000 psi (20.7 MPa) per ASTM C109/C109M. Note: Gypsum-based patching compounds are not recommended and must not be used when installing Lonseal flooring.
LONSEAL ®
Page 9 of 17
Revised: 9.20.2024
Disclaimer: Printed documents are uncontrolled. Always refer to www.lonseal.com for the most current technical information.
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