Structural Integrity and Safety: High-Moisture and High-Traffic Maintenance in Corrugated Plants

Corrugated plants are uniquely demanding industrial environments. They combine heavy machinery, high-speed production, constant forklift and pallet traffic, and process moisture from corrugators, starch systems, and steam - all under one roof, often running 24 hours a day. That combination is punishing to floors, walls, structural steel, and roofing systems. Without deliberate, scheduled maintenance that addresses both moisture and traffic wear, the physical structure of the facility itself begins to degrade - and degraded structures create compounding risks to safety, equipment performance, and regulatory compliance.

This is not a theoretical concern. It’s one of the most consistent issues our teams encounter inside corrugated facilities across the country: facilities that have invested heavily in their machinery but underinvested in the building envelope and structural surfaces that protect everything inside. At Kelly Industrial Services, we work with corrugated and packaging plants nationwide to close that gap - addressing structural maintenance as a core part of a comprehensive facility cleaning and protection program.

What “High-Moisture” Really Means in a Corrugated Environment

Walk through a corrugated plant during production and you’ll immediately understand the moisture challenge. Steam rises from the corrugator’s steam shower rolls and preheaters. Starch is applied wet at high temperatures and immediately begins to migrate - onto rollers, into the air, and eventually onto nearby surfaces. Wash-down areas create puddles and mist that travel farther than expected. Seasonal humidity, especially in the South and Mid-Atlantic, adds ambient moisture that has nowhere to go when a building isn’t well-sealed or well-ventilated.

That moisture doesn’t just affect machinery. It affects everything:

• Structural steel accumulates surface rust and, over time, deeper corrosion that compromises load capacity and weld integrity
• Painted walls and ceilings lose adhesion, allowing moisture to penetrate behind coatings and accelerate deterioration
• Roofing systems develop microfractures and seam failures that allow water intrusion during rainfall, compounding the internal moisture problem
• Concrete floors absorb moisture, weakening surface integrity and contributing to dusting, cracking, and the breakdown of any applied floor coatings
• Pit and conveyor areas become reservoirs for standing water, starch residue, and debris - creating pest risks, slip hazards, and equipment corrosion simultaneously

For facilities that rely on detailed inspection records to meet OSHA, insurance, and customer audit requirements, visible corrosion and water damage on structural surfaces are immediate findings. Addressing them reactively - only after a failed inspection - is far more expensive than preventing them through a regular maintenance program.

High-Traffic Damage: Forklifts, Pallet Jacks, and Production Flow

Beyond moisture, corrugated plants face structural surface wear that few other industrial environments match. Forklifts and pallet jacks operate continuously, often within narrow aisles and tight turning radii. Floor coatings - even high-quality epoxy or urethane systems - degrade over time under that kind of sustained impact and abrasion. Once surface coatings begin to fail, the concrete beneath is exposed, dust begins to generate, and every pass of a forklift grinds the damage deeper.

The consequences extend beyond aesthetics:

• Exposed concrete generates silica-containing dust, creating a respiratory hazard and contributing to air quality issues throughout the plant
• Deteriorated floor coatings make it harder to maintain defined traffic lanes and safety markings, increasing the risk of forklift-pedestrian incidents
• Cracked or uneven floors create vibration and impact forces that travel up through pallet loads, potentially damaging stacked board and contributing to product quality issues
• In areas near corrugators and starch systems, floor surface degradation accelerates when moisture and starch combine with the mechanical wear

Walls in high-traffic areas take similar abuse - corner guards fail, concrete block chips, and painted surfaces get scuffed to bare substrate by repeated impacts from material handling equipment. Without regular inspection and maintenance, those damaged wall surfaces become both an appearance problem and a surface that traps moisture, debris, and bacteria.

Addressing the Building Envelope: Roofing, Walls, and Structural Steel

One of the most overlooked aspects of corrugated plant maintenance is the building envelope itself. Roof systems on large corrugated facilities - often spanning hundreds of thousands of square feet - are exposed to decades of UV radiation, thermal cycling, and weather events. Seams fail. Drains clog. Flashing separates from penetrations. And when a roof leaks, everything below it is at risk: machinery, electrical systems, finished board inventory, and the structural steel that holds the building together.

Industrial roof coatings are one of the most cost-effective interventions available to corrugated plant operators. Applied as a fluid-applied membrane over an existing roof system, a commercial-grade coating seals seams and penetrations, reflects UV radiation, and can extend the usable life of a roof system by a decade or more - for a fraction of the cost of a full replacement. Our teams apply high-performance roof coatings specifically formulated for the thermal and moisture exposure conditions common to large industrial facilities.

For walls and structural steel, the protective approach combines thorough facility cleaning with targeted surface preparation and industrial facility painting. Cleaning removes the accumulated starch, fiber, grease, and contamination that breaks down paint adhesion over time. Proper surface prep - including hydroblasting or media blasting on corroded steel - ensures that new coatings bond to clean metal rather than failing prematurely over rust. High-performance epoxy and urethane coatings then protect those surfaces against the specific combination of moisture, heat, abrasion, and chemical exposure present in corrugated environments.

The Role of Pit and Conveyor Maintenance

Below-grade areas in corrugated plants - conveyor pits, ink pits, and equipment sumps - are often the most neglected and the most hazardous areas in the facility. Product debris, starch residue, ink, process water, and waste paper accumulate rapidly in these spaces. Left unaddressed, that buildup creates pest harborage, fire load, slip hazards for maintenance personnel, and accelerated corrosion of the steel equipment and structures at the pit level.

Pit cleaning services are a specialized part of our corrugated plant maintenance programs. Our teams use vacuum extraction, manual removal, and targeted cleaning methods to clear debris and residue from below-grade areas while maintaining the safety protocols required for confined space work. These areas are also primary candidates for protective coating applications after cleaning, using chemical-resistant systems that slow future buildup and make the next cleaning faster and easier.

Combustible Dust: The Structural Connection

Paper fiber and dust don’t just present fire risks when suspended in the air - they also have structural consequences when they accumulate on surfaces over time. Fiber trapped against painted structural steel holds moisture against the substrate, accelerating corrosion behind the coating. Dust that settles on roof decking or in overhead structural cavities adds fire load and can trap condensation, creating moisture damage from above. The connection between combustible dust management and structural integrity is real, and it’s one reason that our corrugated and packaging facility cleaning programs are designed to address both simultaneously.

Our teams use NFPA 654/664 compliant methods - explosion-proof industrial vacuums, high-reach equipment, and systematic cleaning protocols - to remove dust from rafters, joists, ductwork, and overhead structural areas. That cleaning not only reduces fire risk; it also removes the moisture-trapping fiber layer from structural surfaces, protecting the underlying steel.

Scheduling: The Key to Structural Maintenance That Actually Works

Structural and surface maintenance in corrugated plants only works when it’s planned. Reactive maintenance - addressing moisture damage, coating failures, and floor deterioration only after they become obvious - is always more expensive than prevention. Floor coatings applied over deteriorating concrete bond poorly and fail quickly. Structural steel that has developed deep corrosion requires costly preparation before recoating. Roofs that have leaked for months require remediation of water-damaged insulation and decking before a new coating system can be applied.

The facilities that keep their structures in the best condition are those that treat maintenance as a scheduled, documented program - cleaning and inspecting surfaces on a defined cadence, applying protective coatings before failures occur, and working with a partner experienced enough to identify emerging issues before they become emergencies. Our teams work alongside corrugated plant maintenance managers to develop programs that fit within planned shutdown windows and production schedules, minimizing disruption while systematically addressing structural maintenance needs.

Full-Facility Services for Corrugated Plants

Kelly Industrial Services provides the full range of services corrugated plants need to maintain both their equipment and their physical structure:

• Machine cleaning - dry ice blasting, scraping, and degreasing for corrugators, conveyors, and converting equipment
• Conveyor cleaning services - comprehensive cleaning of belts, rollers, motor housings, and guarding systems
• Facility cleaning - combustible dust removal from overhead structures, rafters, and ductwork
• Facility painting - high-performance coatings for walls, structural steel, and machinery
• Boiler painting services - heat-resistant coatings for boiler systems and high-temperature surfaces
• Industrial roof coatings - fluid-applied roof membranes to seal and extend roof system life
• Pit cleaning services - confined-space safe cleaning of below-grade equipment areas

Every technician on a Kelly job site is a full-time, direct employee - never a subcontractor. That means consistent safety standards, consistent training, and consistent accountability, whether we’re cleaning a corrugator during a weekend shutdown or applying a full roof coating system over multiple weeks.

Ready to Protect Your Corrugated Facility?

If your corrugated plant is showing signs of moisture damage, floor coating failure, rust on structural steel, or roof issues that haven’t been properly addressed, now is the time to act - before those issues compound into larger, more expensive problems. Contact us today to schedule a facility assessment, and visit our resources and blog to learn more about how leading corrugated operations maintain their facilities for the long term.

This post is part of our ongoing series on facility upkeep in corrugated manufacturing, sitting alongside our guides to preventative maintenance, starch and paper dust management, and NFPA 652 combustible dust compliance. Here, we’re looking specifically at waste and scrap areas, and why they need a cleaning strategy of their own.

Why Waste Areas Are a Different Kind of Risk

Balers and shredders concentrate exactly the material combustible dust standards are concerned with: fine paper fiber, compressed scrap, and dust generated by mechanical shredding action. Unlike dust that settles gradually on overhead steel elsewhere in the plant, waste-area contamination is dense, continuous, and often mixed with residual starch and adhesive from trimmed board.

Waste pits add another layer of complexity. Standing scrap combined with humidity and residual starch can begin to compact and, in some cases, generate localized heat through decomposition - a slower but real fire risk that’s easy to overlook because it doesn’t look dramatic day to day.

What Daily Cleaning Should Cover

Daily attention in waste areas is about preventing small problems from compounding. That typically includes:

• Clearing baler feed areas and chutes of jammed or accumulated scrap that restricts airflow and creates pinch points
• Wiping down shredder housings and guards where fine dust collects around moving components
• Visual checks of waste pit levels and conditions, watching for compaction, unusual odor, or heat
• Clearing floor-level fiber buildup around waste handling equipment before it spreads to walkways and adjacent production areas

These tasks are fast, low-equipment, and well suited to operators and floor staff as part of their normal routine. But daily cleaning has a ceiling - it addresses what’s visible and reachable, not what accumulates inside equipment or in areas that require specialized access.

What Deep Cleaning Needs to Address

Deep cleaning in waste areas targets the accumulation that daily tasks can’t reach:

Baler and shredder interiors. Fiber, dust, and starch residue build up inside housings, around bearings, and near hydraulic components, where they contribute to premature wear and create hidden fire risk near motors and moving parts.

Waste pit clearing and sanitizing. Full removal of compacted scrap, cleaning of pit walls and floors, and inspection for structural buildup that daily skimming doesn’t touch.

Conveyor and transfer point cleaning. Scrap conveyors moving material to balers or pits accumulate fiber and starch residue along rollers and belts, affecting both throughput and fire risk. Our conveyor cleaning services address exactly this kind of buildup.

Surrounding structural and floor cleaning. Waste areas often sit beneath overhead steel and ductwork that collects the same fine fiber generated by shredding and baling - work that falls under our broader facility cleaning capabilities.

For equipment with hardened, compacted residue, dry ice blasting is frequently the most effective method, since it removes buildup without introducing moisture into hydraulic or electrical systems - a method we detail further in our guide to dry ice blasting and specialty cleaning.

Setting the Right Cadence

There’s no universal schedule that fits every plant - cadence depends on production volume, scrap rate, and waste system design. But most facilities find success with a layered approach:

• Daily operator-level clearing and visual checks
• Weekly or biweekly cleaning of baler and shredder exteriors and immediate surrounding areas
• Monthly or quarterly deep cleaning of pit interiors, conveyor systems, and equipment housings
• Cleaning cycles adjusted upward during high-volume production periods, when scrap generation increases faster than standard schedules account for

Documenting this cadence matters just as much here as it does with overhead dust control under NFPA 652 - waste areas are frequently part of the same combustible dust hazard analysis and deserve the same evidence of consistent control.

Waste Areas Belong in Your PM Program, Not Outside It

Treating waste and scrap handling as separate from the rest of facility maintenance is how contamination and fire risk quietly build up unnoticed. Folding waste-area cleaning into your broader preventative maintenance strategy - scheduled, tracked, and reviewed alongside production equipment - closes a gap that many corrugated plants don’t realize they have until it costs them.

Let Us Handle What Daily Cleaning Can’t Reach

Kelly Industrial Services works inside corrugated waste and scrap areas as part of our broader facility cleaning work, handling the baler, shredder, pit, and conveyor cleaning that goes beyond what operators can safely manage on their own.

Talk to our team about a waste area cleaning assessment →