What Is Firestopping? A Practical Construction Guide
A practical introduction to why openings and joints in rated assemblies need dedicated firestop systems, not generic patching materials.
New York City Firestopping
Firestop work built around real project conditions.
Through-penetration firestopping, fire-rated joints, perimeter fire barrier, remediation and closeout support for construction and renovation work across New York City.
5 Borough CoveragePlans & Photo UploadsProject DocumentationRepair & Remediation
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90NYC Location Records
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Core Services
View all services →Firestopping is not one generic material application.
The site separates major firestop conditions into dedicated service pages so each scope can be explained, optimized and quoted independently.
Through-Penetration Firestopping
Firestop systems for pipes, conduits, cables and other penetrants passing through rated walls and floors.
Service details →Firestop Caulking
Professional application of listed firestop sealants for compatible wall, floor and penetration conditions.
Service details →Fire-Rated Joint Systems
Fire-resistive joint treatment for construction joints where movement, geometry and rating requirements must be coordinated.
Service details →Head-of-Wall Firestopping
Firestopping for the dynamic or static joint between rated partitions and the structure above.
Service details →Perimeter Fire Barrier
Perimeter fire barrier work at curtain-wall slab edges to help maintain the intended fire-resistance separation.
Service details →Pipe Penetration Firestopping
Firestop treatment for metallic and nonmetallic piping penetrations through rated assemblies.
Service details →Cable & Conduit Firestopping
Firestopping for electrical conduit, cable bundles, sleeves and low-voltage penetrations.
Service details →Mechanical Penetration Firestopping
Firestop solutions around mechanical penetrations and service openings in fire-resistance-rated construction.
Service details →Industries
See all industries →Built for the way NYC projects are actually delivered.
Different occupancies create different access, sequencing, documentation and trade-coordination challenges.
01
Commercial Buildings
Firestop coordination for offices, mixed-use commercial projects, tenant improvements and building upgrades.
02High-Rise Buildings
Firestopping for tall-building floor plates, shafts, risers, curtain-wall edges and multi-trade penetrations.
03Healthcare Facilities
Firestop work planned around healthcare renovation, infrastructure upgrades and occupied-facility constraints.
04Hotels & Hospitality
Firestopping for hotel renovations, guestroom upgrades, back-of-house areas and major building systems.
05Schools & Universities
Firestop support for education facilities, campus renovations, laboratories and infrastructure upgrades.
06Residential Buildings
Firestopping for multifamily construction, apartment renovations, risers and common building systems.
Project Workflow
From opening condition to closeout.
A clear workflow helps prevent firestop scope from becoming a last-minute punch-list problem.
01 / REVIEW
Understand the condition
Assembly, penetrant, opening geometry, movement, insulation and access are identified before work starts.
02 / COORDINATE
Plan with the trades
Scope ownership, sequencing and areas that remain active are organized with the project team.
03 / INSTALL
Execute by area
Work progresses by floor, zone or trade so completed conditions can be reviewed and protected.
04 / CLOSEOUT
Track the finish
Punch-list response, project photos and supporting records are gathered while conditions are still accessible.
NYC Coverage
Dedicated service pages for all five boroughs.
Lead System
Turn site traffic into useful project inquiries.
The built-in quote workflow asks for the information an estimating or project team actually needs before the first call.
Project addressBuilding typeService neededDesired start dateEstimated quantityPDF & photo uploads
Open Quote FormQuestions
Clear answers before the project starts.
What is firestopping?
Firestopping is the use of tested firestop systems to address openings and joints in fire-resistance-rated construction so the intended separation can be maintained under the conditions covered by that system.
Is every red sealant a firestop product?
No. Color alone does not establish suitability. The installed condition should be matched to an appropriate system, product and assembly condition.
Do pipe penetrations and cable penetrations use the same system?
Not necessarily. Penetrant material, size, insulation, opening geometry, wall or floor type and other details can change the applicable system.
Why does annular space matter?
Annular space is one of the field conditions commonly defined in tested system details. A condition outside the documented range should not be assumed to be equivalent.
What happens when a new cable is added through an existing firestop?
The opening should be reviewed after the change. Added cables can alter fill, spacing or the original installed condition, and repairs may be needed.
Can existing firestop be repaired?
Many conditions can be repaired, but the correct approach depends on the existing material, damage, opening and target system condition.
Knowledge Center
View all resources →Technical content that supports organic search and sales conversations.
Every resource is editable from the CMS and can be expanded as real field experience is added.
Firestop Basics
Penetrations
Understanding Through-Penetration Firestop Systems
How penetrant type, assembly type, opening size, annular space and insulation can affect the system that is appropriate for a condition.
Joints
Firestop Joint Systems Explained
A field-focused overview of head-of-wall, floor-to-wall and other fire-resistive joint conditions.
Joints
Head-of-Wall Firestopping: What Project Teams Should Coordinate
Key coordination points for deflection heads, wall continuity, mineral wool and sealant or spray systems.
24/7 EMERGENCY FIRESTOP
Emergency Request →Failed inspection, damaged firestop or urgent closeout?
Use the emergency intake workflow for time-sensitive requests.
Have plans, photos or a firestop punch list?
Send the project details through the built-in intake system.