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White deposits or stains coming up through the floor.

A flooring contractor should lead the review, with a trained moisture tester for slab readings.

Customers put it like this

  • white powder along the seams
  • stain is coming up through the vinyl
  • floor is discolored in spots
  • powder at the joints
Prepare this job in ForeBotFind another guide

Stop first if

  • Old vinyl or black adhesive may be disturbed.Stop. Leave it undisturbed until it has been tested.
  • Slab drilling is planned and tendons, tubing or conduit may be buried.Do not drill until they are located.
01

Ask on the call

5

Homeowner? These are the questions a good technician will ask you. Having the answers ready makes the first visit count.

  1. Where are the deposits or stains, and do they follow seams?
  2. Is the slab on the ground or above it?
  3. Were removers, solvents or acid used on the old floor?
  4. Have there been leaks or spills?
  5. How old is the slab?
02

Bring

5
  • pH strips and distilled water
  • RH probe kit for a trained tech
  • Hygrometer
  • Gloves
  • Phone for photos
03

Check on site

6
  1. Establish grade, slab type, pour date, curing and any barrier under the slab.
  2. Identify the exact covering and adhesive, and pull that pair's limits.
  3. Review any moisture report and its date.
  4. Map the trouble against grade and building features.
  5. Take surface pH at bad and sound spots, noting how each was prepared.
  6. A trained tech runs RH probes after locating tendons, tubing and conduit.
04

Keep on the record

4
  • Photos of deposits or stains
  • Map of affected areas
  • pH and RH readings with dates
  • Cleaning and remover history

General guidance for a qualified person, not a finding about any home. The person on site decides.