Assessing the substrate

Microcement over old tiles: a pre-visit checklist

Existing tiles can sometimes form a base for a new finish, but their presence alone does not settle the question. Their condition, bond, joints, moisture and the geometry of the room all matter. Use this checklist to prepare for a site discussion; a photograph cannot replace inspection.

Junction of a grey floor and wall in a Warsaw bathroom
Bathroom detail in a Warsaw home. This photograph does not document work over old tiles.

At a glance

Mark loose or cracked tiles and any sign of moisture.

Show joints, drain, thresholds and clearance at doors.

Ask for a decision about your actual surface and zone, not a general yes.

Look at the tiles and the surface beneath

Walk through the whole proposed area. Note tiles that move when pressed, are chipped or cracked, or sound different when tapped. These signs do not tell you the extent of a problem, but they do need checking before the old finish is covered. Look for cracks crossing several tiles or joints too.

Tell the contractor about past leaks, repairs or movement if you know of them. A new decorative layer cannot diagnose why the old covering has failed.

  • Photograph cracks and tiles that appear loose.
  • Record stains, damp patches and changes in joint colour.
  • Say whether the problem is constant or follows use of the shower.

Show the joints, flatness and finished levels

Joint width and depth, as well as steps between tiles, affect preparation. Manufacturers’ instructions for systems applied over tiles call for preparing and filling the joints and selecting a primer suited to a non-absorbent surface. The actual method still depends on the selected system and the condition of the existing covering.

Photograph door clearances, fitted furniture, thresholds and the transition to another floor. A new layer changes the finished level; even a thin finish needs room for a sound termination.

Separate the finish from waterproofing

Around a shower and drain, ask about the existing waterproofing, falls, seals and how they can be checked. The appearance of old tiles cannot establish that hidden layers remain watertight. A microcement finish in a wet area needs a solution intended for that location and consistent with the instructions for the chosen system.

If there is a leak or the hidden build-up is unknown, establish the cause before choosing a colour. Agree who is responsible for investigation and for the waterproofing work.

Photographs for an initial conversation

Provide a wide view of the room and close views of important details. Add dimensions or a simple sketch so that each area can be understood in context.

ViewWhat to include
Whole roomFloor, walls, doorways and the layout of zones
DamageLoose or cracked tile and the surrounding area
Joints and edgesJoint width, thresholds and ends beside furniture
Wet areaShower, drain, corners and visible moisture marks

Possible outcomes of the inspection

The recommendation may be to prepare and cover a stable tiled surface, to repair particular areas or to remove the tiles and rebuild the base. Floor area alone cannot settle that choice. Ask which observed conditions lead to the recommendation and exactly which work the resulting quote covers.

VPD Design

Want to discuss your existing tiles?

Send views of the whole surface, damaged spots and wet zones. An initial conversation can establish what must be checked on site.

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