Factory Concrete Floor Repair
Cracks, Joints & Potholes (2026)

What goes wrong with industrial concrete floors

A factory or warehouse slab takes a beating that no house floor ever sees: loaded forklifts and pallet trucks turning on the spot, racking legs pressing into small areas, dropped goods, oil, water from wash-down and years of the same wheel paths. The damage almost always starts small. A joint edge chips, the chip catches a hard wheel, the wheel knocks out more, and within a few months there is a trench across an aisle that jolts every load and wears the forklift.

The good news is that most of it is repairable without breaking out the slab, as long as the cause is understood first. Patching a symptom without knowing why it happened is how the same aisle gets repaired every year.

Reading the damage: a quick triage

The table is a starting point, not a diagnosis. Several of these often appear together, and a floor with rocking panels or wide cracks needs someone to look at what is happening underneath.

Cracks: shrinkage, settlement or overload

Concrete shrinks as it dries, and almost every industrial slab has fine cracks from that alone. They look alarming but are rarely a structural problem. What matters is whether a crack is wide, whether it is growing and whether the two sides are at different levels. ClickBina's crack repair guide advises calling a professional engineer when a crack is wider than about 3 mm or visibly growing over weeks or months, and suggests a dated pencil mark across the crack as the cheapest monitoring tool there is.

Once a crack is confirmed stable, the repair depends on what it has to do. Structural epoxy injection bonds the two sides back together; in ClickBina's epoxy injection crack repair guide the crack is sealed at the surface with injection ports set every 200–300 mm along its length. A crack that only needs to stop dirt and liquids getting in can be routed out and filled instead.

When a crack needs an engineer first

Call an engineer before any repair when a crack is wide, growing, stepped so that one side sits higher than the other, or running near racking bases, machine plinths or columns. The same applies if the floor is to take heavier racking or machinery than it was designed for. ClickBina's crack repair guide lists a structural engineer's assessment from about RM500, required before repairing suspect structural cracks. That is a small cost against the price of a racking run that shifts.

Joint damage: the most common repair

Industrial slabs are cast in bays with saw-cut or formed joints between them, so the concrete can move without cracking at random. The weak point is the edge of each joint, the arris. When the joint is left open, or filled with a soft sealant, hard forklift wheels hit an unsupported edge thousands of times a day and slowly chip it away.

The repair is to cut back the broken edges to sound concrete, rebuild both sides with a repair mortar that suits the traffic, and then fill the joint with a firm filler made for joints that carry hard wheels. A soft mastic that suits a building facade is the wrong material in a forklift aisle. Joints that still move a lot need a different detail, which is another reason to find out why the damage started.

Potholes and spalled patches

A pothole is patched properly only when it is cut back to sound concrete with straight, vertical edges, cleaned, primed where the product needs it and filled with a repair mortar suited to the traffic and the time available before the area reopens. Feathered edges, where the patch thins out to nothing at the sides, are the first thing to break off again. A patch that is left higher or lower than the slab around it becomes the next impact point for every wheel.

Where holes cluster in one area, check for a reason: a wet corner, spilled chemicals, a loading dock where pallets are dropped, or an area of weak concrete from the original pour. Our loading bay and dock leveller guide covers the part of a warehouse that takes the hardest knocks.

Dusting and worn surfaces

A floor that produces fine grey dust however often it is swept has a weak surface layer. It may have been over-worked when it was finished, wetted during trowelling, or simply worn by years of traffic. The dust gets into products and machines and makes coatings fail if they are laid straight over it.

The usual answer is to grind off the weak layer and either treat the exposed concrete or coat it. ClickBina's epoxy floor cost guide explains why surface preparation is the most critical step of any coating job, and lists crack and joint repair with epoxy mortar as part of that preparation. Our polished concrete floor guide covers the grinding route for floors that will stay uncoated.

Repair first, coat second

A coating does not fix a damaged floor; it only covers it. Cracks and broken joints show through, and a coating laid over a dusty surface peels. Repairs therefore come first, then preparation, then the coating system. ClickBina's epoxy floor guide notes that full cure takes 5–7 days, with light foot traffic at 24–48 hours, which matters when the floor has to reopen to forklifts.

Joints are the one place a coating must not simply run across. Working joints are kept open through the coating and refilled afterwards, or the coating will crack along every joint line within weeks.

Repairing a floor that cannot stop

Most factories and warehouses cannot close for a floor repair. The work is usually phased aisle by aisle or bay by bay, with the repaired area barricaded until the material is strong enough for the traffic it will carry. Fast-setting repair materials cost more but shorten the closure, which is often the bigger saving. Plan the phasing with the people who run the floor: which aisles can close, on which days, and where stock and forklifts go in the meantime. Dust, fumes and noise also need planning around food, pharmaceutical or electronics production.

What floor repair costs

Floor repair is usually priced per point, per metre of joint or per patch after a site survey, because the amount of damage decides the job. The figures below come from ClickBina's published guides and are indicative Klang Valley ranges for 2026.

Joint and pothole repair rates vary so much with depth, access and the material chosen that no fair range can be given without seeing the floor, so they are not listed here.

What the quotation should say

• A marked-up plan or list of every crack, joint length and patch to be repaired.
• Which cracks were assessed by an engineer, and what the engineer recommended.
• The repair material for each type of damage, and when each area can take traffic again.
• How joints will be treated if the floor is to be coated afterwards.
• The phasing: which areas close, in what order, and how they are barricaded.
• What happens if more hidden damage is found once the loose concrete is cut out.

How ClickBina can help

ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and trade coordination. For factory and warehouse floor repairs, WhatsApp us your job details for a quote: the floor area, the kind of damage, how the floor is used and when it can be closed. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.

Sources & methodology

• ClickBina epoxy injection crack repair guide — injection rates, engineer assessment, the crack width that calls for an engineer, and injection port spacing.
• ClickBina epoxy floor cost guide — coating system rates, the warehouse floor example, epoxy-mortar repair line, polished concrete rate and cure times.
• ClickBina polished concrete floor guide — the grinding route for uncoated floors.

How we estimated prices: every RM figure on this page is quoted unchanged from the ClickBina guides named above; they are indicative Klang Valley ranges for 2026, not fixed rates or a quotation for your floor.