Map every crack and joint, look for movement or displacement, choose repair materials by behavior and depth, and set expectations that movement can return through a finished coating.
Classify before filling
Record width, direction, length, contamination, moisture, edge breakdown, and vertical displacement. Ask whether the crack changes seasonally or has been repaired before. A dormant hairline crack may need a different detail from a joint crossed by vehicle traffic.
When movement or load capacity is uncertain, obtain qualified concrete or engineering advice before cosmetic work.
Repair geometry matters
A filler smeared across the surface does not rebuild a broken joint shoulder. Repairs may require routing, removal to sound edges, cleaning, backer or depth control, and a material chosen for movement and overcoat compatibility.
The repair must cure within its own requirements before the coating system proceeds.
Appearance expectations
Flake broadcast can disguise color differences around a repair, but it does not flatten displacement or guarantee that a line never telegraphs. Strong side light and glossy finishes can make repairs more visible.
Agree whether joints remain as crisp lines, are filled flush, or receive another approved detail. Photos of representative work help.
Monitor after installation
Keep a precoat crack map and inspect the floor seasonally. If a crack reappears, note width, moisture, and whether the edges are sound. Early local repair may limit contamination beneath the film.
For the full substrate sequence, review concrete preparation and repair.
Common questions
Can a coating guarantee cracks never return?
No. Repair can reduce visibility and restore local support, but concrete and buildings can continue to move.
What is vertical displacement?
It means one side of a crack is higher than the other. That can indicate movement beyond a cosmetic surface line and deserves careful evaluation.
Should every control joint be filled?
No. Joint purpose, movement, traffic, appearance, and system design determine the detail.
Bring the unanswered items into your inquiry
This guide is a planning aid. Ask the installer to identify the current product requirements, verify the concrete and document any unresolved condition before agreeing to the system. The references below provide context; their requirements apply to their named products or procedures.
References behind this guide
Technical limits apply to the named product or test. Confirm the current requirements for your proposed system.
