How to Document a Radon ASD System Installation: A Field Checklist

June 21, 2026 · RemediDocs Team

Active soil depressurization is the workhorse of radon mitigation. You find a suction point, pull soil gas out from under the slab, and vent it above the roofline so it never gets back into the house. The install is the easy part. The part that comes back to bite you is the documentation, because the radon ASD system documentation is what an agent, an inspector, or a homeowner's attorney will ask for long after the truck is gone.

This is a working field checklist. Print it, save it, or share it with your crew. It's organized in the order you actually do the work, from the first measurement to the homeowner handoff. Treat it as a starting framework and confirm the specifics against the current ANSI-AARST SGM-SF standard and your state radon program, since requirements vary and get updated.

Before you start: the pre-mitigation record

You can't prove a system worked if you never documented what it was fixing.

Pre-mitigation radon result in pCi/L
Test method and device used
Test start and end dates and duration
Who performed the test and their certification
Property address and date

That before number is the anchor for everything that follows. Relative to the EPA action level of 4.0 pCi/L, it's the single figure homeowners and agents fixate on, so make sure it's captured cleanly and not buried in an email.

Building assessment and design basis

ASD isn't one-size-fits-all. The foundation drives the design, and your record should show you accounted for it.

Foundation type(s): slab, basement, crawlspace, or a combination
Number of distinct foundation areas to address
Any diagnostic work performed (suction field or communication testing) and what you found
Identified soil gas entry points, sumps, and major slab penetrations
Planned suction point location(s) and the reasoning

Documenting why you put the suction point where you did turns "I drilled a hole" into "I designed a system for this house."

System specifications: the heart of the record

This is the section that's almost always incomplete in a hand-built Word doc. If a future contractor or inspector can't rebuild your system from the paper, the record isn't done. Capture all of it.

Fan make and model
System type (active soil depressurization)
Number and location of suction points
Piping material and diameter
Piping routing: interior or exterior
Discharge point location relative to roofline, eaves, windows, and grade
Static pressure / system performance reading at the manometer
Sealing performed: sumps, accessible cracks, slab openings, crawlspace membrane if applicable
Electrical: connection method and whether a dedicated circuit was used

Photograph each of these as you go. A photo of the fan label, the manometer, the discharge, and the suction point connection is worth more than any description when someone questions the install later.

Safety devices, monitoring, and labeling

The standard expects the system to tell anyone in the house that it's working and not to be disturbed.

System failure indicator installed (u-tube manometer or equivalent) and its location noted
Manometer reading recorded at install (shows the system is under suction)
Warning and identification labels on the fan, piping, and electrical disconnect as applicable
System description label readable to the homeowner

A level u-tube months from now is a service call, and your install documentation showing the original reading is what tells the next tech what "normal" looked like.

The post-mitigation test

The post-test is what proves the job. Rushing it is the fastest way to undermine the whole record.

Post-mitigation radon result in pCi/L
Device used and test duration
Test start and end dates
Confirmation that the wait period after installation was respected before testing began
Before-and-after comparison stated clearly

The standard sets expectations for how soon a confirmatory test can start after install, so don't run it the same afternoon you finished. Document that the timing was correct; it's a detail a careful inspector will check.

Homeowner handoff

The job isn't documented until the homeowner has what they need.

Operating and maintenance information provided
How to read the system monitor explained
What a system failure looks like and who to call
Recommendation to re-test periodically
Signed acknowledgment or delivered operations document on file

A signed handoff is the cleanest proof that you closed the loop, and it protects you if a homeowner later claims they were never told how the system works.

Why doing this by hand falls apart

Read that checklist back and notice how many items live in different places when you're working off a phone and a clipboard. The fan model is in a photo. The pre-test is in an email. The post-test is a text from your tech three days later. Each item is easy on its own. Capturing all of them, the same way, on every job, and producing one clean record at the end is the actual challenge, and it's the one that decides whether your Friday-afternoon document request is a two-minute task or a two-hour scramble.

How RemediDocs runs this checklist for you

RemediDocs turns this list into a guided field workflow. You log the pre- and post-mitigation pCi/L readings, enter the ASD system specs once (fan make and model, CFM, static pressure, piping diameter, suction points, safety devices, discharge), attach your photos, and tap Generate Report. Out comes a branded PDF formatted around ANSI-AARST SGM-SF, ready for the homeowner, the agent, or the inspector before you've left the property.

It runs offline, which matters when the install happens in a crawlspace or a basement with no signal, and everything syncs when you reconnect. Radon, mold, and water all live in the same app, so a multi-trade crew isn't juggling three systems to stay documented.

RemediDocs is a documentation tool and doesn't replace your certification, licensing, or compliance obligations under AARST-NRPP, EPA, or state law. It makes sure the record you're already responsible for is complete and ready when it's asked for.

Put the checklist in your pocket

Print this list, or skip the paper entirely. See the plans at our pricing or start free at a free account and document your next ASD install from your phone. No credit card, cancel anytime.