Post-Remediation Verification Oklahoma City
Proof that isn't self-graded.
Someone just spent a lot of money tearing things out of your house and spraying
chemicals. They handed you a certificate. "All clear."
Who signed that certificate? The company that
billed you for the work?
I provide independent verification. Air samples after the
job is done. A visual check of the area. A report from someone who wasn't holding the spray bottle.
I'm Derrick Fredendall. I don't do remediation. I verify that the people who did actually
finished the job.
You're Here Because Remediation Just Finished
Click what applies to you:
Why Independent Verification Matters
The company that did the work has a financial incentive to declare success. You need someone without that incentive.
The Problem With Self-Certification
Most remediation companies hand you a certificate saying the job is done. They tested their own work. Would you trust a student who graded their own exam?
IICRC S520 — the industry standard for mold remediation — specifically calls for independent third-party verification. Not because remediation companies are dishonest, but because objectivity requires distance.
What I Actually Check
Visual Inspection
All visible mold removed? Surfaces properly cleaned? Containment effective? No contaminated materials remaining? I check everything the remediator should have addressed.
Moisture Readings
Materials must be dry before the job is complete. If moisture remains, mold will return. I verify wood is below 15% moisture and relative humidity is below 60%.
Olfactory Assessment
Do you still smell something musty? Your nose knows. I document any residual odors that may indicate incomplete work or hidden contamination.
Air Sampling
The real test. Air samples from the remediated area are compared against outdoor control samples. Indoor counts should be similar to or lower than outdoor counts.
Lab Analysis
Samples go to an AIHA-accredited laboratory. No guesswork. You get quantified spore counts and species identification.
Documentation
A comprehensive report suitable for insurance claims, real estate transactions, or your own records. Proof that someone independent verified the work.
IICRC S520-2024: The current industry standard for professional mold remediation emphasizes source removal, proper containment, and independent verification. It was cited in the National Defense Authorization Act in December 2025, underscoring its importance.
What You Get With Clearance Testing
Complete verification with documentation you can use.
Visual Inspection
Thorough examination of the remediated area and surrounding spaces for any remaining contamination.
Moisture Verification
Readings of all affected materials to confirm they're within acceptable ranges before reconstruction.
Air Sampling
Indoor air samples plus outdoor control sample for comparison. The objective measure of success.
Lab Analysis
AIHA-accredited laboratory analysis with spore counts and species identification.
Written Report
Comprehensive documentation of findings — pass or fail — suitable for insurance and records.
Results Consultation
I explain what the results mean and what happens next — whether that's approval or additional remediation.
How Clearance Testing Works
Schedule after remediation, before final payment.
The remediation company finishes work but leaves containment in place. They should not remove plastic until you verify.
Call me before you pay the final invoice. Testing should happen while you still have leverage.
Visual inspection, moisture readings, olfactory check, and air sampling. Takes 30-60 minutes depending on area size.
Samples go to an accredited laboratory. Results typically back in 24-48 hours.
If pass: pay your contractor, remove containment, proceed with reconstruction. If fail: contractor continues work until it passes.
Why I'm The Right Person For This
I used to do remediation. I know every corner that gets skipped. Every shortcut that looks fine until you test. Every place mold hides that lazy crews ignore.
Now I don't remediate. I switched sides. I verify that the work was done right by people who are still in that business.
Second opinions work better when the second person has nothing to sell.
I don't compete with remediation companies for contracts. I don't bid on jobs. I don't refer work to companies that refer work to me. There's no handshake deal here.
- Former remediator — I know what to look for
- No remediation services — no incentive to fail you
- No referral relationships — truly independent
- Your protection is my only job
What It Costs
Visual inspection, moisture readings, 2 air samples (indoor + outdoor), lab analysis, written report.
Per additional sample. For larger remediation areas or multiple zones.
Discounted rate for follow-up testing after additional remediation work.
Service Area: Norman, Edmond, Moore, Midwest City, Nichols Hills, and surrounding areas. Mileage fee beyond 45 miles.
Clearance Testing Situations We See
The Insurance Requirement
An Edmond homeowner's insurance company required third-party clearance before closing the claim. The remediation company's self-certification wasn't accepted. My report satisfied the adjuster.
The Suspicious Smell
A Norman family still smelled something musty after "complete" remediation. Clearance testing found elevated spore counts in one corner. The company returned to finish the job properly.
The Before-Payment Protection
A Moore homeowner wisely scheduled clearance testing before paying the $8,000 final invoice. The job passed. He had documentation. Everyone was protected.
The Real Estate Transaction
A Midwest City seller had remediation done after buyer's inspection found mold. My clearance report satisfied the buyer and allowed the sale to proceed on schedule.
Who's Verifying Your Remediation
Derrick Fredendall — TrueSight Environmental
Don't Pay Until You Verify
Clearance testing protects your investment in remediation.