Commercial & Multi-Family Radon in Salt Lake City, UT

Bigger Buildings, Different Physics

A commercial building is not a large house. It has mechanical ventilation moving air deliberately, a slab that may cover tens of thousands of square feet, expansion joints running through it, elevator pits and lift shafts reaching below floor level, and utility trenches crossing underneath. Each of those is a soil-gas consideration in its own right. The measurement approach and the mitigation design both scale differently, and a residential method applied to a commercial floor plate tends to treat the area around the pipe and nothing else.

Where the Exposure Actually Is

The rooms that matter are the ones people occupy for long hours at the lowest level: basement offices, below-grade classrooms and training rooms, records storage that somebody works in daily, lower-level break rooms. A loading dock nobody stands in for more than a minute is a different question from a below-grade office where a person sits for two thousand hours a year. Measurement is placed against occupancy, because dose is concentration multiplied by the time somebody spends in it.

The HVAC System Is Part of the Problem or Part of the Fix

Commercial ventilation can push a building positive or negative relative to the ground beneath it, and that pressure relationship often matters more than the soil does. A building running at negative pressure will actively draw soil gas through every joint in the slab. Sometimes the most effective first move is a commissioning review and a balance adjustment rather than any pipework at all. That is worth establishing before a system is designed, because it changes what the system needs to do.

Testing That Survives Scrutiny

Commercial results tend to be read by people other than the owner — a tenant, a buyer's surveyor, an insurer, a school district, a lender. That means placement, duration, instrument and conditions all have to be documented well enough to stand up to somebody else's questions months later. Multiple measurement points across a large floor plate are normal rather than excessive; one monitor in one corner of a 40,000 square foot slab describes that corner.

Working Around an Occupied Building

Most of this work happens in buildings that cannot close. Core drilling is noisy, and the sensible answer is usually out of hours and staged by zone. Getting a riser routed through an occupied commercial building without crossing tenant space is a coordination problem as much as a technical one, and it is resolved by walking the building with whoever manages it. As with any system, it is not finished until the post-mitigation measurements confirm it. Start with a measurement and tell us the occupancy pattern.

How long does it take? Depends entirely on ground-floor area and how many suction fields the slab turns out to need. Scoping is its own visit, and we say so rather than quoting blind.

Questions People Ask First