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September 2026
Top 5 passive fire protection companies in the United States
Of the 46 passive fire protection companies in the United States listed in the OpenFire directory in September 2026, these profiles were viewed most by people and AI assistants.
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#1
Fire Blockers
FM 4991 approved firestop contractor for Dallas–Fort Worth healthcare work.
Contractor 21–100 people Est. 1996 1 officeCompartment walls & cavity barriers Firestopping PFP survey & inspectionMidlothian, Texas View firm -
#2
FGH Insulation
FM 4991 certified firestop division of a Houston insulation contractor.
Contractor 21–100 people Est. 1969 1 officeCompartment walls & cavity barriers FirestoppingHouston, Texas View firm -
Joint #3
CR Insulation
UL-Qualified firestop contractor supplying the inspection paperwork.
Contractor 6–20 people 1 officeCompartment walls & cavity barriers FirestoppingSan Marcos, California View firm -
Joint #3
JD Firestop Pros
Woman-owned UL qualified firestop and fireproofing contractor.
Contractor 6–20 people Est. 2013 1 officeFirestopping Structural fire protectionTracy, California View firm -
#5
Georgia Firestop
UL Qualified Firestop Contractor covering the South East.
Contractor 6–20 people Est. 1999 1 officeCompartment walls & cavity barriers FirestoppingKennesaw, Georgia View firm
Browse all firms in United States →
Firms are ranked by how often their OpenFire directory profile was viewed during the calendar month, by people and by AI assistants. Search-engine crawlers, other automated traffic and link previews are not counted. Firms with equal views share a rank.
A firm with offices in several countries, or working across several categories, is ranked in each of them on the same monthly total. A ranking is only published where enough firms are listed and viewed for it to be meaningful.
A ranking reflects interest in a firm's listing. It is not an endorsement, and it is not a check of a firm's competence, certification or accreditation.