Why Utah basements need a radon test in the first place
Utah has some of the highest radon levels in the country, and basements are where it concentrates. Radon is a colorless, odorless radioactive gas that seeps up from the soil and rock under your home through cracks, slab penetrations, and the slab-to-wall joint. The EPA sets the action level at 4 picocuries per liter (pCi/L), and Utah's Department of Environmental Quality reports that roughly one in three Utah homes test above it, with a statewide average near 5.3 pCi/L. It's the second-leading cause of lung cancer after smoking. The catch with a basement: it's the lowest level of the home and the closest to the source, so it almost always reads higher than the main floor. A newer or well-built house is not exempt — radon depends on the geology under your lot, not the age of the home. Testing is the only way to know your number.
Why you test BEFORE finishing, not after
Test before you finish because the slab and walls are still open and accessible. Utah DEQ's own guidance says that if a lower level is unfinished but could be occupied in the future, you should test it there — which is exactly what a basement finish does: it turns unoccupied space into a bedroom, office, or family room people breathe in for hours. If your radon number comes back high after you've already framed and drywalled, fixing it means cutting into finished walls to route mitigation pipe and place a fan. Test first and a mitigation contractor has clean access for pipe routing, fan placement, and the sealing of slab cracks and the perimeter joint. It's far cheaper and cleaner to handle radon on bare concrete than to undo finished work. A few days with an $11 kit up front saves a tear-out later.
How to run the test (and read the result)
Order a short-term activated-charcoal kit from Utah's DEQ program at radon.utah.gov for about $11, including the lab processing fee — far less than the $40-$50 hardware-store kits. Place it in the lowest level you plan to occupy, set it on a surface a couple feet off the floor away from drafts and exterior doors, keep windows and doors closed in closed-house conditions, and leave it 2-4 days. Then mail it to the lab and wait for emailed results. If your result is at or above 4 pCi/L, the EPA recommends mitigation; DEQ notes any radon carries some risk, so even readings in the 2-4 range are worth a second look. Because radon fluctuates with weather and season, many homeowners confirm a borderline short-term result with a second short-term test or a long-term test before committing to a system.
Moisture and the vapor barrier — finishing over a DRY space
Check the slab and foundation walls for moisture before any framing goes up, because trapping dampness behind drywall is how you grow mold and rot inside a brand-new finish. A simple tape test works: tape a square of clear plastic tightly to the slab for a day or two and look for condensation underneath, which signals vapor coming up through the concrete. Look for efflorescence (white mineral staining), damp corners, and any past water lines on the walls. Utah sits in IECC climate zone 5/6, which calls for a Class I or II vapor retarder in the framed wall assembly, and we install poly sheeting and rigid foam to keep the concrete's moisture out of your insulation and drywall. Wasatch Finish frames inside the existing footprint, insulates with the correct vapor control, and finishes over a slab that's tested dry — we don't bury a moisture problem.
What we finish vs. what gets referred out
Wasatch Finish does the interior finish of your basement: framing within the existing footprint, insulation and vapor barrier, drywall, paint, trim, interior doors, flooring, and the finish work on a basement bath or kitchenette. That's the non-structural, under-$50,000 scope our Utah DOPL R101 license covers. Radon mitigation is not finish work — installing a sub-slab depressurization system is specialized work that, under Utah rules, must be done by a licensed contractor who is also AARST-NRPP or NRSB certified, so we coordinate or refer that out to a qualified radon professional. The same goes for active waterproofing systems, interior drain tile, and sump installation, plus anything structural or MEP — a new egress window well cut into the foundation, moving plumbing stacks, or panel work. Those are handled by the appropriate licensed trades; we sequence our finish around them so you end up with one clean, dry, tested room.
How radon, moisture, and finishing fit into one timeline
The smart sequence is test, fix if needed, then finish — in that order. Start the radon test and moisture check while the basement is still open concrete, because both need 2-4 days and both are easiest to act on before framing. If radon reads at or above 4 pCi/L, bring in a certified mitigation contractor; their rough work (the suction pit, pipe stub, and crack sealing) is easiest before walls go up. If the moisture check flags water intrusion, that gets solved by a waterproofing specialist first. Only once the space is confirmed dry and tested do we frame, insulate with proper vapor control, drywall, and finish. Because a radon fan and pipe chase are easy to plan around when we know about them early, looping the finish crew in at the testing stage — not after — keeps everything coordinated and avoids reopening walls. Call us at (385) 539-9847 to plan the finish around your test results.
Bottom line
Test your Utah basement for radon (DEQ kit, ~$11, 4 pCi/L action level) and moisture while the slab is still open. Fix anything elevated through certified specialists first — then Wasatch Finish does the interior finish over a confirmed dry, tested space.
Questions
How much does a basement radon test cost in Utah?
A basement radon test in Utah costs about $11 through the state DEQ program at radon.utah.gov, which includes the lab processing fee. That short-term activated-charcoal kit is far cheaper than the $40-$50 kits sold at hardware stores, and the price covers mailing it to the lab and getting your results back by email. A continuous-monitor test or a professional measurement before a real estate transaction costs more, but for a homeowner planning to finish, the inexpensive DEQ kit is the standard first step.
What radon level is unsafe in a Utah basement?
The EPA action level is 4 pCi/L, so a basement that tests at or above 4 picocuries per liter warrants radon mitigation. Utah DEQ stresses that no level of radon is truly safe and any exposure carries some risk, so readings in the 2-4 range are worth watching and possibly retesting. Since the average Utah home runs around 5.3 pCi/L and roughly one in three exceed the action level, an elevated basement reading is common here — it's a solvable problem, not a reason to panic, but it should be addressed before you finish and occupy the space.
Should I test for radon before or after finishing my basement?
Test before finishing, every time. Utah DEQ specifically advises testing an unfinished lower level that could later be occupied — which is exactly what a basement finish creates. Testing on bare concrete means a mitigation contractor has clean access to route pipe, place a fan, and seal slab cracks without cutting into new walls. If you wait until after drywall and paint, fixing a high radon result means tearing into finished surfaces, which costs far more than a few-dollar test kit and a few days of lead time up front.
Does Wasatch Finish install radon mitigation systems?
No, Wasatch Finish does not install radon mitigation systems — that's specialized work we coordinate or refer out to a qualified radon professional. Under Utah rules, a sub-slab depressurization system must be installed by a licensed contractor who is also AARST-NRPP or NRSB certified. Our DOPL R101 license covers the non-structural interior finish: framing within the footprint, insulation, vapor barrier, drywall, paint, trim, doors, flooring, and bath or kitchenette finish work. We sequence our finish around any mitigation or waterproofing so you end up with one dry, tested, finished room.
How do I know if my basement has a moisture problem before finishing?
Tape a square of clear plastic to the slab for a day or two and check for condensation underneath — that's the simplest way to spot vapor coming up through the concrete before you finish. Also look for efflorescence (white mineral staining on walls), damp or musty corners, and old water lines that suggest past intrusion. Because Utah is in climate zone 5/6, code calls for a Class I or II vapor retarder in the framed wall, and we install poly and rigid foam so the slab's moisture stays out of your insulation and drywall. Active water intrusion gets solved by a waterproofing specialist first.