Commercial Radon

Radon Services for Schools, Multifamily, and Commercial Buildings

Large buildings cannot be managed as oversized single-family homes. They have multiple ground-contact rooms, dwelling units, wings, pressure zones, mechanical systems, occupancy schedules, foundations, and quality-control requirements. A valid project needs a testing plan, controlled device inventory, documented deployment, licensed oversight, defensible reporting, and a mitigation design that follows the applicable large-building standard.

Drennen provides licensed measurement, mitigation planning, system activation, new-construction coordination, reporting, and follow-up testing for schools, multifamily properties, commercial facilities, mixed-use developments, and other large buildings in Colorado.

Request a Large-Building Radon Plan Send Plans or Floor Schedules

Projects We Support

Schools and Educational Facilities

Testing plans account for ground-contact classrooms, offices, support spaces, schedules, security, device control, and required recordkeeping. Colorado law requires schools to test for radon and retain results; mitigation decisions require project-specific coordination.

Multifamily Housing

Apartments, townhome blocks, housing-authority properties, senior housing, and mixed foundations require unit-level access planning, representative or comprehensive testing as the applicable protocol requires, tenant communication, QA/QC, and phased mitigation.

Commercial and Mixed-Use Buildings

Retail, offices, community facilities, warehouses with occupied areas, and mixed-use buildings require a building-specific measurement and mitigation strategy rather than a residential shortcut.

New Construction

Drennen coordinates soil-gas control before concealment, including collection plenums, membranes, stacks, fan locations, commissioning, testing, and records under the applicable new-construction standard.

Measurement Planning

1
Define the building and purpose
We confirm the property type, occupancy, number of ground-contact rooms or units, foundation zones, prior results, transaction or compliance purpose, access, schedule, and reporting audience.
2
Select the applicable protocol
The licensed measurement professional identifies the current ANSI/AARST measurement standard incorporated or otherwise applicable to the building and project.
3
Build a device and quality-control plan
Locations, device identifiers, duplicates, blanks, deployment and retrieval routes, closed-building or operating conditions, custody, and field documentation are planned before the first device is placed.
4
Coordinate occupants and facility staff
Written instructions explain access, device security, building operation, prohibited interference, contact people, and what to do if a device is disturbed.
5
Analyze and report
The report identifies methods, licensed oversight, devices, locations, results, QA/QC, deviations, limitations, and recommendations in a format the owner can retain and act upon.

Drennen Quality-Control Workflow

Drennen large-building report templates document licensed supervision, approved electret ion chamber devices, in-house analysis, location-level results, measurement conditions, deviations, and recommendations. A representative internal template uses duplicate devices at 10 percent of test locations and blanks at 5 percent, subject to the applicable protocol and project plan.

Quality-control percentages, device type, and sampling strategy must be selected by the licensed measurement professional for the current project. They should not be copied blindly from an earlier report.

Mitigation in a Large Building

Map slabs, crawl spaces, grade beams, footings, utility trenches, expansion joints, and occupied ground-contact areas
Connect test results to foundation and pressure zones rather than treating every elevated room as an isolated problem
Coordinate suction points, collection piping, fans, electrical, firestopping, roof or wall discharge, condensate, acoustics, and service access
Use phased diagnostics or pilot systems when the building complexity warrants it
Document concealed components and provide final as-built records
Complete post-mitigation testing under the correct large-building protocol

New-Construction Standards

Colorado currently incorporates CC-1000-2018 for soil-gas control systems in new multifamily, school, commercial, and mixed-use buildings. Existing-building mitigation and measurement use different standards. Bring the licensed radon team into plan review before foundations and slabs make critical components inaccessible.

Why Early Coordination Saves Money

Drennen has been asked to activate passive stacks that were installed by other trades without a workable collection plan, suitable fan location, complete labeling, usable electrical provisions, or effective communication across the foundation. Corrections after occupancy can require added cores, new routing, access to tenant spaces, firestopping, roof work, and substantially more expense than proper preconstruction coordination.

What to Send for a Proposal

Architectural floor plans and foundation plans
Building use, unit or room schedules, occupancy, and access restrictions
Existing test reports and system drawings
Mechanical, electrical, plumbing, roofing, and fire-rated assembly information relevant to routing
Project schedule, permit authority, inspection requirements, and decision deadline
Preferred report format and stakeholders who need the findings

Frequently Asked Questions

Build a Defensible Radon Program

Drennen can develop the test plan, coordinate access, perform licensed measurement, issue a clear report, design corrective work, activate passive systems, and complete follow-up testing.

Request a Commercial Radon Consultation

Large-building standards, school requirements, sampling plans, and project specifications can change. The licensed measurement and mitigation professionals must approve the final plan for each property.

Drennen Custom Contracting | Fort Collins, CO | 970-482-9100 | [email protected]