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Firestops for Dissimilar Pipe Materials

There are times when dissimilar piping materials need to be connected during new or retrofit construction work. Old materials being replaced might be difficult to source or it could be advantageous to use a more economically priced pipe material for sections of the line. Whatever the reason, be it supply or cost considerations, the immediate challenges to the plumber will be using the appropriate fittings while the arguably more important impact will be to those responsible for firestopping. When dissimilar materials are installed it becomes imperative to select the proper tested system that allows these specific materials to mate together.

The danger here is that an improperly designed firstop system will allow fire to bypass an otherwise fire rated wall or floor assembly. There are two main examples when we consider joining a metallic pipe to a nonmetallic pipe, and while similar behavior can be expected in walls we will examine the more critical case of a floor assembly. Figure 1 illustrates the example of a relatively short section of metallic pipe being positioned at the floor assembly and extending a minimal distance beyond each side of the assembly where two corresponding connections to a nonmetallic pipe occur. The reasoning behind this transition is that a metallic pipe will not burn and if the annular space between the pipe and opening is firestopped then there is nothing to worry about.

Unfortunately, it is the nonmetallic pipes we need to be concerned about! A fire will quickly burn through the wall of the nonmetallic pipe on the lower floor and the hot air and pressure from the fire will force flames through the metallic stub section of pipe like a chimney. The nonmetallic pipe on the upper story will soon be compromised as the flames erode it from the inside and ultimately allow fire to jump through the barrier. Sometimes to compensate for this type of scenario the metallic pipe will be continuous on the floor below and the nonmetallic pipe transition will occur at an upper story as shown in Figure 2. This type of installation will prevent the chimney effect, but there is still the potential for the metallic pipe to conduct enough heat to the junction point and ignite the nonmetallic pipe.

Building codes recognize the danger these types of transitions may pose. There is language in Chapter 7 of the International Building Code (IBC) that requires connections between noncombustible and combustible penetrating items demonstrate that the fire-resistance integrity of the assembly is maintained. Similarly, there are requirements in Chapter 8 of the NFPA 101 “Life Safety Code” that mandate a minimum 36 inch separation between firestops installed in rated assemblies and any transition between noncombustible and combustible piping, unless this transition has been demonstrated not to reduce the fire-resistance rating. STI has developed firestop systems specifically for pipe transitions between noncombustible
and combustible materials, and STI Engineering Services can provide assistance for these potentially challenging applications.

 

 

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 Literature

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User Guide: North America

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User Guide: International

Our complete product brochure designed for international markets.

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EZ-Path® Fire Rated Pathway

Our complete EZ-Path® product line in one convenient location.

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EZ-Path® Retrofit Device

Our complete brochure for the EZ-Path® Retrofit Device.

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EZ-Path® The Logical Choice

EZ-Path® saves time, money, and resources by removing ongoing downstream costs.

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Perimeter Fire Barrier Systems

STI is dedicated to providing our clients and partners with the industry’s most advanced cost-effective solutions for perimeter fire barrier systems.

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Wood Frame Brochure

STI’s Wood Frame fire & smoke products

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Wood Frame Tri-Fold

The terms firestop and fireblock are very similar sounding, but there are critical differences between these two practices. Here are the major differences.

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E-Wrap™ Tri-Fold

E-Wrap™ Endothermic Wrap is the ideal solution for fire protection of critical circuits and infrastructure such as fire pumps, signaling equipment, elevators, alarms, process control equipment, or Emergency Responder Communications Enhancement Systems (ERCES).

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Interior Finish Brochure

We understand the nuances of firestopping head-of-wall joints and other joint systems installed into or between wall systems. We offer flexible joint sealants and sprays or gasket materials that allow for dynamic movement.

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Available Literature:

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Limited Warranty

STI warrants that its products will be free of defects for one year from the date of purchase. In the event a product does not conform to this warranty, the sole and exclusive remedy is, at STI’s option, replacement of the product or refund of the purchase price. The warranty provided herein shall be void and of no effect in the event that the product is not installed in accordance with STI’s published instructions, listed systems and applicable building and safety codes. THIS WARRANTY IS IN LIEU OF ALL OTHER REPRESENTATIONS AND EXPRESSED OR IMPLIED WARRANTIES (including the implied warranties of merchantability or fitness for a particular use) AND UNDER NO CIRCUMSTANCES SHALL STI BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING, WITHOUT LIMITATION, ANY LOSS OF REVENUE, PROFIT OR USE. Prior to use, the user shall determine the suitability of the product for its intended use, and the user assumes all risks and liability for subsequent use. No person other than an officer of STI is authorized to bind STI to any other warranty for any product for which this warranty is issued.

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Construction Joints
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Curtain Wall
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Electrical-DataCom
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EZ-Path®
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Plumbing – HVAC
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Penetrations

  1. Caulks, Sealants & Putties
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    Product Data Sheet
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    SSS Intumescent Sealant
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    LCI Intumescent Sealant
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    SIL Silicone Sealant (Non-Sag)
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    SIL Silicone Sealant (Self-Leveling)
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    PEN200 Silicone Foam
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    WF Caulk
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    LC Endothermic Sealant
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    SSP Putty
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    SSP Putty Pads
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  1. Collars, Wrap Strip & Cast-In
    Product
    Product Data Sheet
    Safety Data Sheet
    CID Cast-In Firestop Device
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    SSC Intumescent Firestop Collars
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    LCC Intumescent Firestop Collars
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    RTC Intumescent Firestop Collars
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    BLU Wrap Strip
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    BLU2 Wrap Strip
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    BLU220, BLU230, BLU240 Wrap Strip
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    Product Data Sheet
    Safety Data Sheet
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    EZ-Path 33
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    EZ-Path 22
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    EZ-Path Retrofit Device
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    EZ Firestop Grommet
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  1. Electrical & DataCom Cabling
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    Product Data Sheet
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    EZ-Path 44+
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    EZ-Path 33
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    EZ-Path 22
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    EZ-Path Retrofit Device
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    EZ Firestop Grommet
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    SSS Intumescent Firestop Sealant
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    LCI Intumescent Firestop Sealant
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    SSB Intumescent Firestop Pillows
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    Composite Sheet
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    SSM Firestop Mortar
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    Electrical Box Insert
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    SSP Putty
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    SSP Putty Pads
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    FP Intumescent Firestop Plug
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    Ready® Sleeve
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    Ready® Split Sleeve
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    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Wall – Blue)
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    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Wall – White)
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    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Ceiling)
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    EZ-Path® Series 44NEZ Smoke and Acoustical Device
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  1. Electrical Circuit Protection
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    Product Data Sheet
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    Cable Spray
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  1. Outlet & Panel Box Protection
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    Product Data Sheet
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    Electrical Box Insert
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    SSP Putty
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    SSP Putty Pads
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    Thermal Barrier Wrap
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  1. Large Opening
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    Product Data Sheet
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    SSB Intumescent Firestop Pillows
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    Composite Sheet
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    SSM Firestop Mortar
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    STI-SSAMW
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    IIG (JM)-Type CW8
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    IIG (JM)-Minwool 1200 Safing
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    Owens Corning Thermafiber-Firespan 40 & 90
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    Owens Corning Thermafiber-Impasse System Complete
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    Owens Corning Thermafiber-Impasse System Hangers
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    Owens Corning Thermafiber-Impasse System Spiral Anchors
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    Owens Corning Thermafiber-Safing
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    ROCKWOOL-CurtainRock 40
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    ROCKWOOL-CurtainRock 80
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    Roxul-Safe
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  1. Other
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    FyreFlange HVAC Firestop Angle
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    Closet Flange Firestop Gasket
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Construction Joints

  1. Joint Sprays
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    AS200 Elastomeric Spray
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    Fast Tack® Firestop Spray
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  1. Joint Sealants
    Product
    Product Data Sheet
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    SSS Intumescent Firestop Sealant
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    LCI Intumescent Firestop Sealant
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    SIL Silicone Sealant (Non-Sag)
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    SIL Silicone Sealant (Self-Leveling)
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    ES Elastomeric Firestop Sealant
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    LC Endothermic Firestop Sealant
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  1. SpeedFlex Joint Protection
    Product
    Product Data Sheet
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    SpeedFlex® TTG Track Top Gasket
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    SpeedFlex® Joint Profile System
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Curtain Wall

  1. Perimeter Fire Barrier Sprays
    Product
    Product Data Sheet
    Safety Data Sheet
    AS200 Elastomeric Spray
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    pdf_icon_small
    Fast Tack® Firestop Spray
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    pdf_icon_small
    Safing Spray
    pdf_icon_small
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  1. All Weather Firestop Sprays
    Product
    Product Data Sheet
    Safety Data Sheet
    Fast Tack® Firestop Spray
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    pdf_icon_small


  1. Anchor Protection
    Product
    Product Data Sheet
    Safety Data Sheet
    Connection Protection
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  1. Curtain Wall Insulation Materials
    Product
    Product Data Sheet
    Safety Data Sheet
    STI-SSAMW
    pdf_icon_small
    pdf_icon_small
    IIG (JM)-Type CW8
    pdf_icon_small
    pdf_icon_small
    IIG (JM)-Minwool 1200 Safing
    pdf_icon_small
    pdf_icon_small
    Owens Corning Thermafiber-Firespan 40 & 90
    pdf_icon_small
    pdf_icon_small
    Owens Corning Thermafiber-Impasse System Complete
    pdf_icon_small
    pdf_icon_small
    Owens Corning Thermafiber-Impasse System Hangers
    pdf_icon_small
    pdf_icon_small
    Owens Corning Thermafiber-Impasse System Spiral Anchors
    pdf_icon_small
    pdf_icon_small
    Owens Corning Thermafiber-Safing
    pdf_icon_small
    pdf_icon_small
    ROCKWOOL-CurtainRock 40
    pdf_icon_small
    pdf_icon_small
    ROCKWOOL-CurtainRock 80
    pdf_icon_small
    pdf_icon_small
    Roxul-Safe
    pdf_icon_small
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  1. Quick Clip Insulation Hangers
    Product
    Product Data Sheet
    Safety Data Sheet
    Quick Clip™
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    Quick Clip™ L-Bracket
    pdf_icon_small
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Smoke & Acoustical

  1. EZ-Path Smoke & Acoustical Pathway
    Product
    Product Data Sheet
    Safety Data Sheet
    EZ-Path® Series 33NEZ Smoke and Acoustical Device
    pdf_icon_small
    pdf_icon_small
    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Ceiling)
    pdf_icon_small
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    EZ-Path® Series 44NEZ Smoke and Acoustical Device
    pdf_icon_small
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  1. Sealants & Sprays
    Product
    Product Data Sheet
    Safety Data Sheet
    Application Data Sheet
    Smoke N Sound Acoustical Spray
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    pdf_icon_small
    pdf_icon_small
    Smoke N Sound Acoustical Sealant
    pdf_icon_small
    pdf_icon_small
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Fireblocking/Draftstopping

  1. SmokeBlock
    Product
    Product Data Sheet
    Safety Data Sheet
    SmokeBlock® 136
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    SmokeBlock® 200
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 Approval Information

 Specification Review Services

Did you know that many specifications for firestopping reference older fire test standards or obsolete products?

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