Placing underslab radon rock efficiently is one of the most critical structural and environmental steps during commercial foundation preparation. When managing multi-family developments and large-scale commercial builds, contractors face tight schedules, complex site access, and strict environmental compliance codes.
At Grove in Bloom, an impactful affordable housing development located in Fort Collins, Colorado, Ground Solutions was selected to manage the complete sub-base aggregate scope. Our team delivered end-to-end purchasing, delivery, slinger truck placement, fine grading, and compaction of underslab radon rock across 23 distinct building footprints.
Here is a look at how our turnkey slinger truck capabilities streamlined this high-volume project, keeping the build on timeline and within budget.
Project Overview: Grove in Bloom Apartments
Grove in Bloom is expanding accessible housing options across Northern Colorado. Building 23 separate foundation bases requires massive logistical coordination, continuous material flow, and highly precise aggregate depth to ensure slab stability and proper gas ventilation.
Project Key Metrics
- Project Name: Grove in Bloom Apartments
- Location: Fort Collins, CO
- Structures Involved: 11 apartment buildings, 1 clubhouse building, and 11 garage structures (23 total buildings)
- Total Coverage Area: 106,954 Sq. Ft.
- Material Supplied: ~2,000 tons of 3/4″ crushed aggregate
- Application Depth: 4-inch uniform layer
- Scope of Work: Complete turnkey procurement, aggregate delivery, conveyor slinger placement, fine grading, and mechanical compaction
Why Underslab Radon Rock is Essential for Front Range Construction
Installing high-quality underslab radon rock serves two indispensable purposes in Colorado commercial construction:
1. Structural Stability and Load Distribution
A 4-inch compacted bed of clean, angular 3/4″ rock forms an unyielding base beneath concrete slabs. It distributes heavy structural loads, prevents differential settling, and acts as a capillary break to block ground moisture from rising through the slab.
2. EPA Zone 1 Passive and Active Radon Mitigation
Fort Collins and Larimer County fall within EPA Zone 1, indicating high potential for elevated indoor radon gas levels. A uniform 3/4″ underslab radon rock layer creates a continuous, high-permeability void space beneath the entire building slab. This gas-permeable layer enables sub-slab depressurization systems to draw radon away from living units and vent it safely above the roofline.
Overcoming Site Logistics with Precision Slinger Placement
Traditional methods of spreading underslab radon rock involve dumping aggregate on the site perimeter and shuttling it into foundation bays using skid-steers or wheelbarrows. On a busy 23-building jobsite, this approach creates major friction:
- Subgrade & Barrier Damage: Heavy equipment driving over prepared subgrades risks disturbing utility trenches, damaging footings, and tearing delicate vapor barriers.
- Excess Labor Costs: Manually moving 2,000 tons of rock across thousands of square feet demands massive crews and slows down follow-on trades.
- Inconsistent Depth: Hand-raking frequently results in high and low spots, causing unexpected concrete volume overages during the pour.
The Ground Solutions Slinger Truck Solution
Ground Solutions eliminated jobsite bottlenecks by utilizing our specialized fleet of conveyor slinger trucks:
- 90-Foot Direct Launch: Our operator-controlled slingers throw material directly over foundation walls and forms without equipment ever entering the building footprint.
- Turnkey Execution: We handle the full lifecycle—sourcing quality 3/4″ aggregate, hauling it to the site, flinging it into position, fine-grading to tight tolerances, and thoroughly compacting the layer.
- Pour-Ready Delivery: After completing all 106,954 sq. ft. of underslab radon rock placement, the foundation beds were immediately ready for moisture barrier installation and concrete pouring.
Partner with Ground Solutions on Your Next Commercial Project
Ground Solutions brings speed, efficiency, and material control to jobsites across Colorado, Wyoming, and Nebraska. Whether you need high-volume aggregate placement, pipe bedding, or specialized Underslab Radon Rock & Gravel Services for your next multi-family or commercial build, our team is equipped to keep your project moving smoothly. Contact our estimators today at (970) 776-8150 to request a project quote.