Carrier profile · USDOT 1396146 · Updated Sep 6, 2026

Sierra Insulation Co Inc

11 power unitsavg 5.5 yrLocal · 1 statesAUBURN, CA100/100

AUTHORITY STATUS UNKNOWN

Observed fleet · trailing 24 mo daily

11Power units

4 observed · MCS-150

—Trailers seen

None observed · 24 mo

5.5Avg age (yr)

2016–2024 · vPIC

Call dispatch(530) 889-2186 Email dispatchlewilliams@sierrainsulationco.com

Click to see how we scored it

Load decision · FMCSA snapshot · Sep 6, 2026

Clear to load

Active authority and a clean federal record. No blocking issues found.

Watch · 0

Nothing flagged.

In good standing · 1

Established 21 yearsOperating authority has been on file since 2005.

USDOT registration

yr registered

Authority not on file

Insurance (BIPD)— unknown

No filing on record

Vehicle OOS · 24-mo0.0%

▼ 22.26% nat'l

Crashes · fatal

Clean · 24 mo

USDOT registration

yr registered

Authority not on file

Insurance (BIPD)— unknown

No filing on record

Vehicle OOS · 24-mo0.0%

▼ 22.26% nat'l

Crashes · fatal

Clean · 24 mo

Vektor intelligence · beyond the federal recordProprietary signals computed from VIN-decoded inspections & daily FMCSA snapshots

Fleet typeIdentity

Asset-based

11 power units. Brokers price each fleet type apart.

Fleet age vs peersNewer

5.5 yr

Model years 2016–2024 · peer benchmark unavailable.

Identity stabilityStable

21 yr unchanged

Same registration since 2005 — no chameleon / reincarnation signal.

Safety

5 inspections · 24 mo · vs national benchmarks

Out-of-service rate· 24-mo cumulative · vs national

Vehicle OOS 0.0%24-mo cumulative

050%nat'l 22.26%

Driver OOS 0.0%24-mo cumulative

030%nat'l 6.67%

Every inspection in the window pooled — 3 vehicle and 5 driver inspections over 24 months.

Vehicle OOS rate· vehicle OOS · vehicle-level inspections · 6-month trailing

0.0% · latest 6-mo window

Share of vehicle-level roadside inspections in each trailing six-month window that resulted in a vehicle out-of-service order. More resolved windows are needed to establish a trend. The national vehicle benchmark uses the same metric and is shown on the chart.

Roadside inspection history· 24 charted calendar months · vehicle / driver level · any-OOS overlay

5 inspections in the charted months · busiest month Dec '25 · 2

Vehicle-levelDriver-levelAny OOS

Monthly FMCSA roadside inspections across the 24 charted calendar months. Bars show level-qualified vehicle and driver populations; one inspection can qualify for both. The line shows inspections with any out-of-service result.

Inspection coverage· expected vs observed · the fraud signal

Inspection coverage

How heavily FMCSA inspects this fleet for its size — it tells you how much to trust the safety signals above. Thin coverage on a young authority is a fraud signal nobody else surfaces.

Thin coverage

Under-inspected

Expected

Well-monitored

Heavily inspected

≈0.2 / unit·yr

thin signalabundant signal

Few roadside inspections for a 11-unit fleet — the out-of-service and violation signals above rest on a small sample, so weight them cautiously. Thin coverage on a young authority is itself a flag.

Registered power units: 11
Inspections · 24 mo: 5
Annualized: ≈3 / yr
Coverage: ≈0.2 inspections / unit · yr

Violation themes· decoded · grouped by BASIC

What this carrier actually gets cited for — FMCSA violation codes decoded into plain English, ranked by frequency.

392.2 State/local traffic law violation (speeding, etc.)Unsafe Driving5 · 0 OOS
390.21 USDOT number marking on vehicleUnsafe Driving1 · 0 OOS
393.9 Inoperative required lampsVehicle Maintenance1 · 0 OOS
393.95 Emergency equipment (extinguisher, triangles)Vehicle Maintenance1 · 0 OOS

Explore full safety record — inspections, BASICs, crashes

Authority & Insurance

Can they legally + adequately haul your load?

Insurance continuity· insurer · policy · lapses

No insurance filing history on record.

This timeline is the FMCSA filing history, and it ends at the most recent superseded filing — current policy status is not tracked here. Request a certificate of insurance to confirm active coverage before tendering.

Explore full authority & insurance record

Equipment

VIN-decoded · NHTSA vPIC

Capacity· power units = haulable capacity; trailers are towed

Registered power units (MCS-150): 11
Observed power (24 mo): 4
Trailers (towed): 0

Capacity is power units only — trailers are towed equipment and are never summed into a fleet-size figure.

Fleet age· model years · decoded VINs

5.5 yr

Average age

2024

Newest model yr

2016

Oldest model yr

25.0%

VINs decoded

Explore full fleet — VIN roster, equipment mix, age distribution

Operations & Lanes

Revealed by inspection density across 1 states · 24 mo

Operating footprint· revealed by roadside-inspection geography

Operating radiusLocal

revealed

States observed

US states

Inspections · 24 mo

CA busiest

Inspection density by state· each tile = a state · shade = inspections, last 24 mo

Home base

AUBURN, CA

2025 AIRPARK CT STE 50

Top corridor

CA 5

Density

fewermore

Shade = roadside inspections, last 24 mo.

See the full operating map — state density, top lanes

Network & Fraud

Affiliated entities & reincarnation signals · for review, not a verdict

Shares a company officer with other carriers

tim williams — 41 carriers: USDOT 91463 USDOT 326556 USDOT 544693 USDOT 748269 USDOT 756801 USDOT 827886 USDOT 851862 USDOT 887122

Capacity consistency· registered vs roadside-observed power units

Registered (MCS-150)

Observed (24 mo)

Registered capacity materially exceeds what is observed roadside — the MCS-150 may be stale or the fleet under-utilized.

Explore the carrier network & VIN cross-links

Identity & Federal

FMCSA census + L&I dossier

Location

Physical address: 2025 AIRPARK CT STE 50, AUBURN, CA, 95602
Operation: Interstate

Contact

Phone: (530) 889-2186
Fax: (530) 889-2199
Email: lewilliams@sierrainsulationco.com
Web domain: sierrainsulationco.com

Registration

Officers: Tim Williams · Corey Williams
USDOT / docket: 1396146
First registered: Jul 18, 2005
Last MCS-150: Apr 16, 2026 · 250,000 mi (2024)
FMCSA safety rating: Not rated
Recordable crash rate: 0.00
D-U-N-S: —

Fleet (self-reported · MCS-150)

Power units

Drivers

—CDL drivers

250,000

Annual mileage

Open the full identity & federal record

Federal activity

Daily-captured FMCSA licensing & insurance changes — monitored by Vektor

Federal record activity· monitored daily by Vektor

No licensing or insurance changes captured since Vektor began monitoring this carrier (June 2026). Quiet is usually good.

Open the full federal-record activity feed

Reviews

Verified broker, shipper & driver reviews — moderated

Performance ratings only — never the Vektor risk score

No verified reviews yet

Be the first broker or shipper to rate SIERRA INSULATION CO INC. Reviews cover performance only — on-time delivery, payment speed, communication — and never affect the Vektor risk score.

Leave a review

Open reviews

Verification summaryAuthority, insurance, safety and identity facts for SIERRA INSULATION CO INC.

SIERRA INSULATION CO INC (USDOT 1396146) has a Vektor safety score of 100/100 and a Clear to load verdict, from the carrier's FMCSA record refreshed Sep 6, 2026.

The carrier has an unknown current for-hire authority status because no FMCSA L&I authority row is available as of Sep 6, 2026.

It has an unknown current BIPD insurance status because no FMCSA L&I active-filing snapshot is available as of Sep 6, 2026.

Its vehicle out-of-service rate was 0.0% over the last 24 months, versus the 22.26% CVSA national average, from FMCSA roadside-inspection data refreshed Sep 6, 2026.

The carrier received 5 roadside inspections in the last 24 months — 3 vehicle-level and 5 driver-level — across 1 state, according to FMCSA roadside-inspection data refreshed Sep 6, 2026.

The carrier has 0 reportable crashes in the last 24 months and 0 fatal crashes across the full FMCSA crash record available as of Sep 6, 2026.

It reports 11 power units and 20 drivers in its most recent MCS-150 filing dated Apr 16, 2026.

It has no FMCSA-assigned safety rating in the federal record refreshed Sep 6, 2026.

Frequently asked

What is SIERRA INSULATION CO INC's USDOT number?

SIERRA INSULATION CO INC's USDOT number is 1396146.

Is SIERRA INSULATION CO INC authorized to operate?

As of Sep 6, 2026, SIERRA INSULATION CO INC is active in the FMCSA register.

What is SIERRA INSULATION CO INC's safety record?

SIERRA INSULATION CO INC has a 0.0% vehicle out-of-service rate (national average 22.26%) across 5 roadside inspections, with 0 reportable crashes in the last 24 months, and is not currently rated by FMCSA. Vektor's computed risk score is 100/100 (tier: clear).

How big is SIERRA INSULATION CO INC's fleet?

SIERRA INSULATION CO INC operates 11 power units and 20 drivers per its most recent MCS-150 filing.

Where is SIERRA INSULATION CO INC based?

SIERRA INSULATION CO INC is based in AUBURN, CA, with roadside inspections recorded across 1 state.

Similar carriers near Auburn, CA

Comparable carriers around Auburn and across California

Royce D Duncan Clear · 100Auburn, CA · 7 power units

All American Towing and Transport Inc Clear · 100Auburn, CA · 7 power units

Hall's Towing Inc Review · 84Auburn, CA · 6 power units

Allstate Van & Storage Inc Clear · 100Poway, CA · 18 power units

Nor Cal Trucking Inc Clear · 100Live Oak, CA · 18 power units

Cross Road Xpress Inc Clear · 100Manteca, CA · 18 power units

Landmark Global Inc Clear · 100Santa Barbara, CA · 18 power units

Cal Freight Transport LLC Clear · 100San Diego, CA · 18 power units

More in California →Top safety in California →Veteran carriers in California →

More California carriers

Other FMCSA-registered carriers near this one in the directory, by USDOT number.

Lockwood CompaniesBakersfield · 1 power unit Bernardo MedinaLos Angeles · 1 power unit F&j Trucking IncClearOak Hills · 9 power units Alan Wayne UnderwoodReviewPalmdale · 1 power unit Cnyx-sf IncLos Angeles · 2 power units M Chavez Express LLCRiverside · 1 power unit