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Joint & CrackRepair
Protect Your Floor. Preserve Your Investment.
Comprehensive Surface PreparationDone Right, Done In-House
Concrete cracks are inevitable — but ignoring them isn’t an option.
Diama-Shield provides expert joint and crack repair services designed to restore surface integrity, prevent further damage, and protect your flooring investment for the long term.
Our Services Include:● Control joint filling to prevent edge spalling from forklift traffic● Expansion joint repairs to accommodate thermal movement● Crack chasing and filling using high-performance flexible sealants● Surface crack repair and stabilization for cosmetic and structural improvement
By properly addressing cracks and joint failures early, you can prevent moisture intrusion, improve safety, and extend the lifespan of your polished concrete or coated floor system.
As part of our turnkey floor care approach, Diama-Shield ensures repairs are properly sequenced and surface-matched — so your floor performs better and looks seamless.
Trusted by the Nation’s Leading Brands
We’ve completed large-scale, multi-site projects for some of America’s most iconic companies — including:
Maintaining Commercial and Industrial Floor Joints
Control joints and formed joints create necessary interruptions in otherwise seamless concrete surfaces. If not properly installed and maintained, floor joints become impact points which will deteriorate at an accelerated rate, damage material handling vehicles and contribute to surface spalling. Properly maintaining floor joints prolongs a floors service life, increases productivity, creates a safer work environment and makes cleaning easier.
Common Floor Joint Maintenance / Repair Issues
Joint Filler Separation
(Gap or Void Between Joint Fill and Slab Edge)
Cause: Changes in the slab due to evaporation and contraction affect joint dimensions and cause tears in semi-rigid joint fillers.
Concern: Separation voids with a width of 1/32" (credit card width) have the potential to expose joint edges to impact damage. Debris embedding in separation voids may also cause sanitation concerns.
Repair: Separation voids should be cleaned and filled with semi-rigid polyurea filler.
Joint Filler Collapse
(Joint Fill Develops Concave Profile Between Slab Edges)
Cause: Extreme joint opening or underlying deficiencies in original fill or backer installation.
Concern: Joint fill collapses or is punched down to expose joint edges to impact and damage.
Repair: Remove existing filler, re-chase or saw cut joint to create clean, structurally sound edges and refill joint with semi-rigid polyurea.
Joint Edge Spall
(Deterioration of Joint or Slab Edge)
Cause: Joint edges left exposed to impact damage from material handling operations and consumer use.
Concern: Chips and spalls weaken a floor's structural integrity and worsen over time. They may also be caused by operational problems that should be addressed (i.e. dangerous material handling practices or improper maintenance of MHV tires).
Repair: Remove existing filler, re-chase or saw cut joint to create clean, structurally sound edges and refill joint with semi-rigid polyurea. Investigate cause or problem and make operational changes as necessary.
Common Surface Condition Issues
Random Cracks
Less than 1/8" Width
Cause: Natural contraction and shrinkage of slab. May be influenced and exacerbated by climatic conditions.
Concern: Cracks may run and expand if left unaddressed. Edges are exposed to impacts resulting in greater spalling. Trip hazards and unsanitary conditions may arise. Reflects poorly on corporate image.
Repair: Clean crack using right angle grinder with soft wire brush or Nyalox wheel. Vacuum or blow clean. Slightly overfill crack with structural repair polyurea, allow to cure and grind flush with floor.
Random Cracks
Greater than 1/8” Width
Cause: Natural contraction and shrinkage of slab. May be influenced and exacerbated by climatic conditions.
Concern: Substantial likelihood of larger spalls and impact damage. Lost operational productivity. Reduced efficiency in material handling operations. Large cracks constitute trip hazards and foster unsanitary conditions. Reflects a negative corporate image.
Repair: Use a right angle grinder with a diamond “U” or “V” blade to rout out crack to a3/4” depth. Vacuum or blow clean routed crack. Choke off base with silica sand to prevent excessive seepage. Apply semi-rigid epoxy or polyurea joint filler. Allow to cure and razor off excess.
Surface Spalls
Less than 6"
Cause: Material handling vehicles and material handling practices.
Concern: Small spalls will continue to grow if left unaddressed. Unsanitary conditions and unsightly appearance hurts moral and projects a poor image to customers.
Repair: Use wire brush or Nyalox wheel to clean and abrade spall, vacuum, slightly overfill with polyurea and grind flush with floor surface.
Surface Spalls
Greater than 6"
Cause: Material handling vehicles and material handling practices.
Concern: Large spalls and gouges create trip hazards, disrupt material handling operations, result in unsanitary conditions and decrease overall productivity and corporate image.
Repair: Make cuts to define outer edges of area to be repaired, chip out spall section to vertical saw cut edges, wire brush and vacuum clean. Slightly overfill area with structural epoxy mortar and grind flush with floor surface.
Developing a Floor Monitoring and Maintenance Program
Implementing a well-designed floor monitoring and maintenance program is the best way to prolong a concrete floor's service life and to avoid costly and disruptive repairs.
Designate a Floor Steward
A single person (typically from operations or maintenance department) should be designated “Floor Steward”. The Floor Steward should be trained to identify common floor issues and procedures for basic floor repairs.
Schedule a Periodic Monitoring Plan
Floors should be monitored and inspected on a routine, periodic basis. It is important to schedule floor inspections to create a baseline and ensure consistency.
Standardize an Inspection Routine
A standardized inspection routine promotes consistency and allows for efficient inspections.
Document Inspections in Writing and with Photos
Areas requiring corrective action or additional monitoring should be mapped and photographed for easy identification by maintenance personnel and management. Documentation should be available for scheduling corrective actions or for future monitoring.
Prioritize Areas of Concern
Areas requiring repairs or additional monitoring should be prioritized according to severity, urgency of corrective action and relative impact on business operations.
Standardize Corrective Action Guidelines
Develop a Floor Monitoring and Repair Manual which clearly outlines inspection and monitoring procedures as well as methods and materials to be used for maintenance and repairs.
Authorize Professional Repairs When Necessary
Determine a procedure for authorizing and scheduling repairs that should be performed by a professional flooring contractor such as Diama-Shield.