What Is LVP Subfloor Telegraphing?
LVP (Luxury Vinyl Plank) and LVT (Luxury Vinyl Tile) are among the thinnest flooring products on the market — typically 2-5mm total thickness. Unlike thicker flooring products that can bridge minor subfloor irregularities, LVP and LVT conform to the subfloor surface. Every crack, ridge, nail head, depression, and seam in the substrate below is transmitted — or 'telegraphed' — through the vinyl surface as a visible defect.
Telegraphing is the #1 LVP complaint in forensic flooring inspections. The condition appears as visible lines, shadows, ridges, or depressions in the finished floor that mirror the subfloor condition below. In severe cases, the pattern of the subfloor — plywood seams, concrete cracks, old tile grout lines — is clearly visible through the LVP.
The root cause is almost always inadequate subfloor preparation. LVP manufacturers specify subfloor flatness within 3/16 inch in 10 feet (some require 1/8 inch in 6 feet for thinner products). This is a flatness specification, not a levelness specification — the subfloor does not need to be level, but it must be flat. When installers skip the straightedge test, skip filling depressions, or skip grinding high spots, telegraphing is the predictable result.
In Southern California, the most common telegraphing scenarios involve LVP installed over existing tile (old grout lines show through), LVP over cracked concrete slabs (crack lines mirror through), and LVP over plywood subfloors with raised nail heads or seam offsets.
What Causes LVP Subfloor Telegraphing?
Subfloor Not Flat Enough
LVP manufacturers require subfloor flatness within 3/16 inch in 10 feet (some specify 1/8 inch in 6 feet). When the subfloor exceeds this tolerance, the thin LVP conforms to the irregularities and telegraphs them through. This is the most common cause and is an installation deficiency — the subfloor should have been prepared before installation.
Installation Over Existing Tile or Flooring
LVP installed over existing ceramic tile, VCT, or sheet vinyl telegraphs the pattern of the old flooring through the surface. Old grout lines, tile edges, and adhesive ridges all show through. Manufacturer specifications typically require removing existing flooring or preparing it to meet flatness tolerances.
Concrete Slab Cracks
Cracks in concrete slabs — from settlement, shrinkage, or seismic activity — mirror through LVP as visible lines. Even hairline cracks can telegraph through thin vinyl. The subfloor should be evaluated and cracks addressed with patching compound or crack isolation before LVP installation.
Raised Fasteners in Wood Subfloors
Nail or screw heads that sit even slightly proud of the plywood surface telegraph through LVP as visible bumps. Wood subfloor fasteners must be driven flush or countersunk before LVP installation. Loose or protruding fasteners must be addressed during subfloor preparation.
Plywood Seam Offsets
When adjacent plywood sheets are not at the same height — from improper installation or swelling — the seam edge telegraphs through LVP. Plywood subfloor seams must be sanded flush before LVP installation. This is particularly common in renovations over older wood subfloors.
Insufficient Patching or Leveling
Depressions in the subfloor that were not filled with self-leveling compound or patching material create visible dips in the LVP surface. Conversely, excess patching material that is not feathered smoothly creates ridges that telegraph as raised lines.
Symptoms to Look For
- Visible lines, shadows, or patterns in the LVP surface that mirror subfloor conditions
- Old tile grout lines or flooring patterns visible through the LVP
- Crack lines from the concrete slab visible through the vinyl
- Small bumps or ridges at regular intervals (fastener locations)
- Depressions or dips visible in the floor surface
- Shadows that become more visible at certain lighting angles (raking light)
What an Inspector Checks
When to Call an Inspector
Contact a certified flooring inspector when:
• Subfloor imperfections are visibly telegraphing through the LVP
• The condition appeared immediately after installation
• The installer disputes that subflat preparation was inadequate
• The LVP was installed over existing flooring and the old pattern shows through
• Documentation is needed for a warranty or contractor dispute
Our Inspection Process
Frequently Asked Questions
Is LVP telegraphing an installation or product problem?
Almost always an installation deficiency. LVP is designed to be installed over a properly prepared subfloor meeting manufacturer flatness specifications (typically 3/16 inch in 10 feet). When the subfloor is not prepared — cracks not filled, ridges not ground, depressions not leveled, existing flooring not removed — the thin LVP conforms to the irregularities and telegraphs them through. The product is performing as designed; the installation was non-compliant.
Can telegraphed LVP be fixed without replacement?
No. Once LVP is installed over an inadequately prepared subfloor, the only correction is full removal, proper subfloor preparation (filling, grinding, leveling), and reinstallation. The telegraphed imperfections are in the subfloor, not the LVP — the product is simply conforming to the surface beneath it.
Can I install LVP over existing tile?
Some manufacturers permit installation over existing tile if the tile is fully adhered, flat within manufacturer tolerances, and free of loose or cracked tiles. However, grout lines and tile edges frequently telegraph through thin LVP. Best practice is to remove existing tile and prepare the subfloor from scratch, or use a self-leveling underlayment to create a flat surface over the existing tile.
Related Flooring Issues
Vinyl / LVP
Vinyl floor buckling — where planks or sheets lift dramatically off the subfloor — is caused by thermal expansion without adequate room, moisture beneath the floor, or adhesive failure in glue-down systems.
Learn moreVinyl / LVP
LVP (Luxury Vinyl Plank) lifts and separates when thermal expansion forces exceed locking joint capacity, when subfloor moisture destroys adhesive bonds, or when subfloor irregularities prevent proper contact.
Learn moreVinyl / LVP
Click-lock flooring comes apart when locking mechanisms fail — typically from thermal expansion stress, subfloor irregularities, inadequate expansion gaps, or manufacturing defects in the locking profile.
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Clicking, popping, crackling, or creaking noises in vinyl flooring are caused by subfloor irregularities, thermal expansion movement, loose locking joints, or debris beneath the floor. Some noise is normal, but new or worsening sounds may indicate installation deficiency.
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