INSULATION & REFRACTORIES SERVICES INC
Operations
What INSULATION & REFRACTORIES SERVICES INC’s FMCSA record shows
Each field from the public registration, and what it means when you’re vetting this carrier.
- USDOT number 8421
- The USDOT number is FMCSA's permanent ID for this company. It never changes, even when the business renames, moves, or changes owners, so it's the most reliable way to identify INSULATION & REFRACTORIES SERVICES INC.
- MC number None on file
- No MC number is on file. That's normal for private fleets hauling their own goods and for intrastate-only carriers, but a company with no MC number can't legally haul regulated interstate freight for hire.
- Operating status Active
- FMCSA lists this USDOT number as active. Active status alone doesn't confirm current insurance or operating authority; those are separate checks.
- Operation type Interstate
- Interstate carriers can haul freight across state lines and fall under the full federal safety rules (FMCSRs).
- Fleet size 5 power units, 9 drivers
- INSULATION & REFRACTORIES SERVICES INC self-reports 5 power units (trucks and tractors), which makes it a small fleet. Fleet counts come from the carrier's own MCS-150 filing and aren't independently audited.
- Last MCS-150 update Mar 20, 2026
- The MCS-150 is the registration form where carriers report their address, fleet size, and operations. INSULATION & REFRACTORIES SERVICES INC last filed it on Mar 20, 2026. That's within FMCSA's two-year update requirement, so the company details here are reasonably current.
Safety profile
FMCSA BASIC percentiles, inspection history, and out-of-service rates.
Full safety report
All 7 FMCSA BASIC percentiles, recent inspection records, vehicle & driver out-of-service rates — free with any account.
Crash history
State-reportable crashes, severity breakdown, and time-decayed analysis.
Crash history
Individual crash records with date, severity (fatal / injury / tow-away), and fleet-normalized rate.
Insurance & compliance
Active policy coverage, insurance carrier, effective dates, and historical gaps.
Insurance details
BI&PD coverage, cargo insurance, insurance carrier name, effective dates — a critical pre-booking check.
Authority & cross-reference
Authority revocation history and chameleon carrier detection across 4.4M records.
Authority & cross-reference
Every authority grant, revocation, and reinstatement — plus chameleon flags from address / officer / phone matches.
Change history
2 recorded changes to INSULATION & REFRACTORIES SERVICES INC’s FMCSA record. Derived from monthly FMCSA Census snapshots.
12
to
9
Jan 8, 2024
to
Mar 20, 2026
Frequently asked questions about INSULATION & REFRACTORIES SERVICES INC
Common questions about this carrier, answered from FMCSA public records.
Is INSULATION & REFRACTORIES SERVICES INC a legitimate motor carrier?
INSULATION & REFRACTORIES SERVICES INC is registered with FMCSA under USDOT number 8421. Operating authority status is currently Active.
Where is INSULATION & REFRACTORIES SERVICES INC based?
INSULATION & REFRACTORIES SERVICES INC lists its physical address in MEMPHIS, TN in FMCSA records. The physical state and city fields are provided by the carrier on their MCS-150 form.
Is USDOT 8421 active?
USDOT 8421 (INSULATION & REFRACTORIES SERVICES INC) operating authority status is currently Active. Last verified by Carrier90 on April 17, 2026. Data is sourced from live FMCSA federal records.
How many trucks does INSULATION & REFRACTORIES SERVICES INC operate?
INSULATION & REFRACTORIES SERVICES INC reports 5 power units and employs 9 drivers to FMCSA. These figures come from the carrier's most recent MCS-150 filing.
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Nearby USDOT numbers
- SOUTHERN PRODUCTS CO INC DOT 8416
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- SOUTHEASTERN SUPPLY CO J H MCMINN-J H MURPHY DOT 8422
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- SPARTANS INDUSTRIES INC DOT 8429
Related resources
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