If you’re crushing rock, recycling concrete, producing topsoil, processing compost, or running any kind of aggregate operation, screening is what turns raw output into saleable product. A rock screener separates bulk material into spec-sized fractions — fines, mids, and oversize — so each pile is ready to sell, reuse, or send back through a crusher for further reduction.
This guide explains exactly how rock screeners work, the differences between the main types, how to size a screener for your operation, and where Komplet America’s full lineup of mobile screeners fits your material and volume. Whether you’re brand new to screening or looking to upgrade from an older plant, this is written to help you make a confident decision.
What Is Rock Screening, and Why Does It Matter?
Screening is the mechanical process of separating bulk material into different size fractions using a mesh, punch plate, or perforated deck. When crushed stone or excavated material passes over a screen, smaller particles fall through the holes while larger particles travel across the deck and discharge separately. The result is sorted piles, each at a specific spec size.
Screening matters because the market pays for specific sizes. A random pile of crushed concrete has limited value — but the same pile sorted into ¾” base rock, #57 stone, and fines suddenly has three distinct revenue streams. Screening is what takes a crushing operation from cost-center to profit-engine.
It also matters for quality. Road base, drainage fill, landscape stone, pipe bedding, and concrete-mix aggregate all require specific gradations. Without a screener, you can’t meet spec. Without meeting spec, you can’t sell.
How a Rock Screener Actually Works
Every mobile rock screener — regardless of brand — operates on the same three-step principle:
- Material is loaded into a receiving hopper, either directly by an excavator or backhoe, or via a discharge belt from an upstream crusher. A vibrating feeder (or rotating drum, in the case of trommels) meters the material onto the screening deck at a controlled rate.
- The material moves across angled screen decks with specific mesh sizes. Smaller particles fall through the openings; larger particles travel across the surface. Multiple decks stacked vertically allow simultaneous separation into three or more size fractions.
- Each size fraction exits via its own discharge conveyor, building separate stockpiles of fines, mids, and oversize. Oversize material can be stockpiled, returned to the crusher for further reduction, or hauled off as reject.
The two things that determine how well a screener performs are (1) the screening media — mesh size, type, and condition — and (2) the deck action — angle, vibration stroke, and speed. A good screener gives you control over both.
Two Main Types of Rock Screeners: Vibrating vs. Trommel
Most rock screening in North America is done with one of two machine types. They work differently, handle different materials, and are built for different applications.
Vibrating Scalping Screens
A vibrating scalping screen uses inclined decks driven by a vibrator motor. The decks shake aggressively to stratify material by size: fines drop through the top deck first, mids through the second deck, and oversize travels off the end. Vibrating screens are fast, high-throughput, and well-suited for dry, hard materials like crushed concrete, rock, and aggregates.
Best for: Crushed stone, concrete recycling, aggregates, dry C&D material, heavy-duty production screening.
Komplet’s vibrating scalping screener lineup covers three size classes:
- Kompatto 221 — compact, up to 90 US tph, 7′ x 3.5′ two-deck. One of the smallest self-propelled mobile screening plants on the market. Ideal for tight-access sites and pairs directly with the K-JC 503 or K-JC 704 PLUS crushers.
- Kompatto 5030 — Komplet’s best-selling screener, up to 280 US tph. Heavy-duty 8′ x 3′ double-deck with 3-way split configuration. Produces three spec sizes simultaneously. The workhorse for C&D recyclers, small quarries, and soil processors.
- Kompatto 124 — Komplet America’s largest mobile scalping screen, up to 350 tph. 11.8′ x 3.7′ top deck, 75 HP Tier 4F diesel. Built for high-volume contractors, landscapers, recyclers, and rental fleets needing serious production in a still trailer-portable package.
Trommel Screens
A trommel screen uses a slowly rotating cylindrical drum with perforated walls. Material enters one end of the drum and tumbles gently as the drum rotates. Fines fall through the holes along the length of the drum; oversize exits out the far end. Trommels are gentler than vibrating screens, handle wet or sticky material much better, and are ideal for organics.
Best for: Compost, topsoil, mulch, green waste, wet or moist material, anywhere the gentler drum action outperforms aggressive vibration.
Komplet offers two trommel models:
- K-TS 30 — compact trommel, up to 80 tph. 68″ x 51″ or 103″ x 51″ drum configurations. Diesel-electric or all-electric power options (23 kW genset). Perfect for composting operations, landscape yards, and municipal organics programs.
- K-TS 40 — larger trommel, up to 120 tph. 126″ x 55″ or 171″ x 43″ drum configurations. 40 kW genset. Delivers three material fractions (fines, mids, overs) for high-volume compost and soil operations.
Which Type Do You Need?
The rule of thumb: if your material is dry and abrasive (concrete, rock, aggregates), go vibrating. If your material is moist, sticky, or organic (compost, topsoil, mulch), go trommel. A lot of operations that only have a vibrating screen struggle with composting and green-waste work because sticky material plugs the decks. A trommel solves that problem.
Six Questions to Ask Before You Pick a Rock Screener
Before you spec a screener, answer these six questions. The answers determine which machine is right for you.
1. What material are you screening?
Material characteristics drive the decision. Crushed concrete, rock, and dry aggregates call for a vibrating scalping screen. Compost, topsoil, mulch, and green waste call for a trommel. Mixed C&D debris (concrete with wood, rebar, and wire) usually needs a vibrating screen plus a magnetic separator. If you’re processing multiple material types, you may need two machines — or a versatile vibrating screen like the Kompatto 5030 that can be configured for different screening media (steel mesh, punch plates, or reinforced bars).
2. What end product sizes do you need?
Screeners separate material based on mesh size. If you need three spec sizes (for example: fines, 3/4″ base, and 2″ oversize), you need a double-deck or triple-fraction machine. Komplet’s Kompatto screeners feature fast hydraulic conversion between 2-way and 3-way split configurations — change from producing two end sizes to three in minutes, not hours. The Kompatto 5030 screens from 1/4″ topsoil fines up to 5″ oversize, covering most contractor needs.
3. What production rate do you need?
Screener capacity is rated in tons per hour (tph) under ideal conditions. Real-world output depends on material moisture, feed consistency, screen media choice, and operator skill. Most contractors overestimate what they need — a Kompatto 221 at up to 90 US tph handles small-to-mid contractor operations. A Kompatto 5030 at up to 280 US tph handles most daily-production operations. The Kompatto 124 at up to 350 tph is for serious daily throughput or rental fleet use.
4. How will you feed the screener?
Komplet’s Kompatto screeners can be fed directly by an excavator, backhoe, processed material pile, or the discharge belt of an upstream crusher. The Kompatto 221 is specifically designed to be fed directly — no secondary equipment required. For higher-volume operations, a dedicated wheel loader keeping the feeder hopper supplied maximizes throughput.
5. Where and how will you move the screener?
Every Komplet screener is self-propelled on rubber tracks, with hydraulically folding conveyors for transport and a wireless remote control for positioning. The Kompatto 221 at 7,275 lb is one of the most portable screeners on the market. The Kompatto 5030 at 26,455 lb and the Kompatto 124 at 37,038 lb are larger but still move on a standard heavy-duty trailer. If job-to-job mobility is your priority, start with the 221.
6. Is screening a standalone operation or part of a crushing circuit?
A Kompatto can operate as a standalone screener (excavator-fed piles) or as part of a crushing and screening circuit paired with a Komplet jaw crusher. The Krokodile PLUS shredder + Kompatto 5030 screener combo is our best-selling two-machine recycling system. For combined crushing and screening, the K-JC 704 PLUS + Kompatto 5030 is a proven high-output workflow for demolition and concrete recycling contractors.
Materials You’ll Screen — and Which Screener Handles Each Best
Here’s a quick matching guide by material type:
Construction & Demolition (C&D) Recycling
- Asphalt, concrete, brick, reinforced concrete: Vibrating scalping screen. Kompatto 221, 5030, or 124 depending on volume. Pair with a magnetic separator if rebar is present.
Natural Stone & Aggregates
- Granite, limestone, sandstone, bluestone, river gravel, sea gravel: Vibrating scalping screen, typically downstream of a jaw crusher. Kompatto 5030 or 124 for quarry-scale operations.
Topsoil, Compost, and Organics
- Compost, topsoil, mulch, green waste: Trommel screen. K-TS 30 for smaller operations, K-TS 40 for high-volume composting or municipal organic waste programs.
Landscape Material
- Decorative stone, gravel, screened soil: Either vibrating or trommel depending on moisture. For dry bagged-stone yards, Kompatto 221 or 5030. For wet topsoil blending, K-TS 30 or K-TS 40.
Waste and Industrial Streams
- Ore, industrial waste, landfill reclaim: Vibrating scalping screen. Kompatto 5030 handles a wide range of industrial streams with steel mesh, punch plates, or reinforced bars as screening media.
The Real Revenue Math: What a Screener Actually Earns You
Owning a screener doesn’t just save money — it creates revenue streams you didn’t have before. Every ton you sort into a spec size is a ton you can sell at market rate instead of giving away as unsorted reject.
Example: A C&D Recycler with a Kompatto 5030
A mid-volume concrete recycler processes 3,000 tons of mixed crushed material per month. Without a screener, this material sells for $8/ton as unsorted base fill. With a Kompatto 5030 sorting the same output into three fractions:
- Fines (25% = 750 tons): Sold as manufactured sand at $18/ton = $13,500/month
- #57 stone (50% = 1,500 tons): Sold at $22/ton = $33,000/month
- Oversize (25% = 750 tons): Sold as base rock at $15/ton or returned to the crusher for further reduction = $11,250/month
- New total revenue: $57,750/month vs. $24,000/month unsorted. That’s $33,750/month in new revenue from the same material.
Against a Kompatto 5030 priced at $209,061.48 financed over 60 months (~$4,400/month at 9.9% APR via Komplet Capital), the screener pays for itself in about six months — and every month after is additional margin.
These numbers vary by market, material mix, and local aggregate pricing. Call 908-369-3340 and we’ll run a payback calculation using your specific volume and your local aggregate prices.
Why Compact? Why Komplet Screeners?
Compact mobile screeners are not smaller versions of quarry-scale stationary plants. They’re purpose-built for contractors, recyclers, rental houses, and small producers who need flexibility, mobility, and affordability that bigger equipment can’t offer.
Why Komplet specifically:
- Self-propelled on rubber tracks — move the screener anywhere on site with wireless remote control. No crane, no truck needed for repositioning.
- Quick setup under 15 minutes — from transport to production on most models.
- Hydraulically folding conveyors — fast transport setup, no manual assembly.
- Fast 3-way to 2-way split conversion — hydraulic, takes minutes (Kompatto 5030 and 124).
- Variable feeder speed — dial in the throughput to your material and end-product targets.
- 1-year / 1,000-hour warranty — on all new units.
- Parts forecasted 12 months in advance — when you’re down, we ship.
- Direct distributor model — Komplet America is the official exclusive distributor for North and Central America. Call Cody or Joe at 908-369-3340 and you talk to the people who know the machines.
- Full ecosystem in one brand — jaw crushers, impact crusher, vibrating scalping screens, trommel screens, shredder, and tracked conveyor. Room to grow your operation within a single relationship.
- Italian engineering, 25+ years — Komplet SpA has focused exclusively on compact recycling equipment since 2000, celebrated its 25th anniversary in 2025, and is the specialist in this segment.
- Industry memberships — AED, AEM, ARA, CDRA, NDA, USCC. Every major industry association.
- Komplet Capital financing — 24-hour credit approval, 100% financing, 3-6 year terms.
- Section 179 eligible — up to $1.22M of new equipment deductible in the year of purchase (2024 limit) for year-end tax planning.
Frequently Asked Questions
What’s the difference between a screener and a crusher?
A crusher reduces the size of material. A screener separates material into size fractions. Most operations use both in sequence: the crusher reduces raw rock or debris, and the screener sorts the output into saleable spec sizes. Learn more about Komplet’s full crusher lineup and how they pair with screeners.
Do I need a trommel screen or a vibrating screen?
If your material is dry and abrasive (concrete, rock, aggregates), use a vibrating scalping screen. If your material is moist, sticky, or organic (compost, topsoil, mulch), use a trommel. Trying to run compost through a vibrating screen results in constant mesh blockage. Trying to run dry rock through a trommel is slower than it needs to be. Use the right tool for the material.
How much does a mobile rock screener cost?
Komplet’s Kompatto scalping screeners are priced as follows: Kompatto 221 at $104,935.48, Kompatto 5030 at $209,061.48, and Kompatto 124 at $268,070.40. Trommel screen pricing (K-TS 30 and K-TS 40) is available by quote at 908-369-3340. Komplet Capital financing is available with 24-hour approval and 3-6 year terms.
What production rate does a Komplet screener produce?
Kompatto 221: up to 90 US tph. Kompatto 5030: up to 280 US tph. Kompatto 124: up to 350 tph. K-TS 30 trommel: up to 80 tph. K-TS 40 trommel: up to 120 tph. All rates are maximums under ideal conditions — consistent feed, skilled operator, proper screen media, and dry material. Actual throughput depends on material moisture, feed consistency, and target spec size.
Can one screener produce multiple product sizes at once?
Yes. Komplet’s Kompatto 5030 and Kompatto 124 both feature fast hydraulic conversion between 2-way and 3-way split configurations. A 3-way split produces three end-product sizes simultaneously — for example, fines, mid-size, and oversize — from a single pass. The 2-way split is faster but produces only two sizes. Switching between the two takes minutes, not hours.
Does a Komplet rock screener have dust suppression?
Dust suppression on Komplet’s Kompatto vibrating scalping screeners is available as an option at order time — it is not standard. (Note: on Komplet’s crushers, dust suppression is standard on every model, which is important for OSHA silica compliance.) If you’re screening dusty material or operating in a regulated environment, specify dust suppression when you order your Kompatto. It’s a simple add-on that makes a significant difference on dry-material job sites.
Can a Komplet screener be used alone, or does it need a crusher?
A Komplet screener can operate as a standalone unit. The Kompatto 221, for example, is specifically designed to be fed directly by an excavator or backhoe — no crusher needed. Many landscape yards and topsoil processors operate screeners as standalone machines. Of course, screeners also pair seamlessly with Komplet crushers to create a complete crushing-and-screening circuit for C&D recycling operations.
How quickly can a Komplet screener be set up on a new job site?
Most Komplet screeners go from transport position to production in under 15 minutes. Tracked mobility, hydraulically folding conveyors, and wireless remote control make setup a one-operator job. Arrive on site, drop the tracks, unfold the conveyors, power up, and start feeding.
What makes Komplet the right choice for screening?
Five things set Komplet apart for screening operations. First, a full ecosystem in one brand — jaw crushers, impact crusher, vibrating scalping screens, trommel screens, shredder, and tracked conveyor. You can build and grow a complete recycling operation without changing suppliers. Second, Komplet America is the direct exclusive distributor for North and Central America, so when you need support you call 908-369-3340 and reach Cody or Joe — no dealer mediation, no call center. Third, parts inventory is forecasted 12 months in advance, so when you need a screen mesh or wear part, it ships fast. Fourth, Komplet Capital in-house financing offers 24-hour approval, 100% financing, and 3-6 year terms with bad credit not an automatic disqualifier. Fifth, 25+ years of Komplet SpA engineering focused exclusively on compact recycling equipment — the machines are specialized, refined, and built for the work. For contractors and recyclers who want a partner rather than a transaction, Komplet is the compact-segment specialist.
Final Thoughts
Screening isn’t a secondary step — it’s where unsorted output becomes multiple revenue streams. A contractor who crushes without screening leaves most of the margin on the table. A recycler who screens without the right machine fights moisture, mesh blockage, and inconsistent product. Getting the match right between your material (dry and abrasive vs. moist and organic), your target output sizes, and your throughput volume is what separates a screener that prints money from one that sits in the yard.
Komplet America offers the full range of compact mobile screeners — from the tight-access Kompatto 221 through the best-selling Kompatto 5030 up to the Kompatto 124 (our largest mobile scalping screen at up to 350 tph), plus the K-TS 30 and K-TS 40 trommels for compost and organics. Browse our full screener lineup to see specs and pair options, or reach out and we’ll help you figure out exactly which machine fits your material and your throughput goals.
Ready to Talk Screening?
- Call 908-369-3340
- Email [email protected]
- Schedule a demo or request a quote
- Ask about our 1-year / 1,000-hour warranty and equipment financing options
Never enough — that’s how we approach service, support, and helping you turn raw material into spec-sized profit.
Disclaimer: All ROI, payback, and revenue figures in this article are illustrative examples based on sample assumptions about volume, local pricing, material mix, and operating conditions. Actual results vary significantly by region, market, material type, equipment utilization, operator skill, financing terms, and many other factors. Dump fees, aggregate pricing, fuel costs, hauling rates, and interest rates all change over time and by location. Komplet America makes no guarantee, warranty, or representation of specific financial performance or payback timelines for any particular operation. For a payback estimate based on your specific volume, material, and local market, contact us at 908-369-3340 to speak with our team.
