When your project needs reliable, fast-setting backfill, Flash Fill concrete is the solution that saves time and money.
At On-Demand Concrete, we specialize in Flashfill in Northern Colorado and throughout the state, delivering Quick Set Flowable Fill that helps contractors finish jobs faster, safer, and smarter.
What Is Flash Fill Concrete?
Flash Fill concrete—also called flowable fill or controlled low-strength material (CLSM)—is a self-leveling, self-compacting material that replaces traditional compacted soil. It flows easily into place, fills voids completely, and hardens quickly to create a solid, stable base.
Our Quick Set Flowable Fill product is preapproved under the Flashfill category by CDOT, the City and County of Denver, and multiple Colorado municipalities. This mix achieves strength in under 30 minutes, allowing asphalt or concrete patching within an hour. That speed makes it ideal for municipal repairs, utility projects, and commercial sites where downtime matters.
Why Choose Flashfill from On-Demand Concrete?
Contractors and municipalities across Colorado choose On-Demand Concrete’s Flashfill for consistency, compliance, and cost savings.
Fast Setting Time
Our Quick Set Flowable Fill gains early strength fast—cutting wait times so roads and sites reopen sooner.No Compaction Needed
Traditional backfill requires layer-by-layer compaction. Flash Fill concrete flows into place on its own, filling even the tightest areas with no heavy equipment required.Lower Labor and Equipment Costs
Because placement is simple and quick, you save on crew time and machinery.On-Site Mixing for Quality Control
Our volumetric trucks mix fresh material at your job site. You get the exact amount needed and pay only for what you use.Trusted Across Colorado
From Fort Collins to Denver, our Flashfill is trusted and approved by local and state agencies for long-term durability.
Where Flash Fill Concrete Works Best
Flash Fill concrete is perfect for a wide range of backfill and repair applications, including:
Utility trench backfill (water, sewer, gas, electric)
Filling voids under sidewalks, slabs, or driveways
Abandoning old pipes, tanks, or manholes
Roadway and bridge repairs
Emergency infrastructure restoration
Because it’s fluid and self-leveling, Flash Fill easily fills irregular or hard-to-reach spaces where compactors can’t operate.
Introducing Flashfill Traffic Cap
In addition to our Quick Set Flowable Fill, On-Demand Concrete offers Flashfill Traffic Cap—a specialized top layer designed to reopen traffic lanes quickly and safely.
This durable surface layer allows vehicles to drive over the area until permanent asphalt restoration can take place. It’s an ideal solution for utility cuts, emergency repairs, and high-traffic zones that can’t afford long closures.
How Our Flashfill Process Works
Request an Estimate – Share your project details and schedule.
Delivery & On-Site Mixing – Our trucks arrive with materials ready to blend on site.
Placement – We pour the flowable mix directly into the trench or void—no compaction needed.
Curing – Within 30 minutes, your Flash Fill concrete sets strong enough for asphalt or concrete overlay.
Traffic Cap (Optional) – Apply our Flashfill Traffic Cap to allow temporary traffic flow until final restoration.
Cleanup – Quick, clean, and efficient with minimal waste.
This streamlined process keeps your project moving without costly delays.
Flashfill Across Northern Colorado
On-Demand Concrete proudly provides Flashfill in Northern Colorado and across the Front Range, including Fort Collins, Greeley, Loveland, Boulder, Denver, and beyond. As a locally owned company, we understand the region’s unique soil, weather, and access challenges—so we deliver mixes that perform no matter the conditions.
Call On-Demand Concrete today for a Free Estimate.