What this guide helps you decide
Obtain the exact product's flatness and substrate requirements before installation. A floor can be level but wavy, or sloped but flat; the locking joints care about local changes.
Start with the existing conditions
Use a suitable straightedge in several directions to locate humps and dips. Record where seams move or sound hollow and check for moisture damage before adding patch materials.
Plan materials, layout and access
Choose preparation suited to plywood, concrete or another approved substrate. Grinding, approved leveling products and localized repairs have different limitations and curing requirements.
Check the result and plan follow-up
Recheck the surface after prep and before underlayment. Confirm whether an underlayment is already attached to the plank and whether an additional layer is permitted.
Common mistakes to avoid
- Using thick foam to hide unevenness
- Installing over soft or wet subfloor
- Confusing “level” with “flat”
Tony’s Pro Tip
Dry-fit a few planks across the worst spot before committing to a whole room. Rocking or flexing is a warning to inspect the substrate.
Should you DIY or hire help?
Hire a flooring specialist if unevenness is widespread, the subfloor is damaged or the preparation changes door and stair elevations.
Keep planning with related guides
Need a second set of eyes?
My Neighborhood Handymen serves Rockwall, Heath, Fate, Rowlett, Royse City and nearby North Texas communities. Text us a photo or request an estimate for a project that needs hands-on help.
Request a Free EstimateGeneral homeowner education only; not a substitute for a site inspection or manufacturer instructions. Local code, permits and applicable licensing may affect the correct approach. © 2026 My Neighborhood Handymen. All rights reserved.