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Metallic Stub-Ups For Plastic Piping Systems

As a firestop manufacturer, we are frequently asked to provide firestop design recommendations for various applications. Many of these questions deal with firestopping nonmetallic pipes. With over 45 UL tested and classified designs for firestopping virtually all types of plastic pipes through all common constructions, STI is a recognized leader in the industry.

An alarming trend that we are seeing is the use of short lengths of metallic pipe being used to replace the plastic pipe where it penetrates a fire-rated floor. I’m sure this idea has been conceived with the best of intentions as an inexpensive method of fire-protecting nonmetallic pipe penetrations. These efforts are misguided in that metallic stub-ups in many applications may be extremely dangerous and actually complicate the fire protection of plastic pipes.

The Chimney Effect: During a fire, a convection current draws cool , oxygen rich, heavy air to the fire and hot gasses and smoke are expelled. Since hot gasses become lighter and rise, the oxygen rich, cooler gasses tend to be at the lower level of the room. In simple terms, the dividing line between the expanded heated gasses and the cooler gasses at the lower elevations in the room is known as the neutral pressure plane. Above the neutral pressure plane, pressures will be positive and hot gasses will seek an escape path (a lower pressure area) In a fire, any vented piping system open to the fire at or above the neutral pressure plane will be a natural path for the flow of hot gasses as well as the flames themselves.

Underwriters Laboratories tests plastic pipes by extending the pipe 1’ into the assembly and 3’ above it. The end of the pipe extending into the furnace is capped using a material similar to that used in the pipe. In tests of vented systems for DWV applications, the end of the pipe extending out of the furnace is left uncapped. Thus when the furnace is lit, the fire burns the cap off and positive furnace pressure projects the fire into and up the pipe. Depending on the size of the pipe and the method of protection used, the fire may project up and out of the pipe, very quickly igniting the plastic on the unexposed side of the assembly. On pipes open to the fire, flames have been observed projecting out of these pipes to a height of 6’ or more above the floor surface!

Stub-Ups are not the answer! Experience demonstrates that replacing the plastic pipes at the floor with a short length of metallic pipe is not the answer. The fire will simply be blown past the metallic pipe into and up the pipe, spreading the fire with alarming speed. Combustible construction and stub-ups represent an even more dangerous combination. Wood construction members in close proximity to the pipes can ignite literally in seconds! The fact is… Combustible pipes are very frequently used in combustible construction. Thus where it may be the most critical, dangerous systems offering little or no protection are being used. Considering Sanitary Tees and branch connections that occur within the floor membranes themselves, there is no logical method for replacement of plastic pipes that offers any assurance of safety without specific testing.

The proper way to protect plastic pipes during a fire is to close them down and block the path of fire, hot gasses and smoke. The best place to do this is within or below the plane of the floor. Tested firestop products and devices represent the best and safest approach to the protection of plastic pipe penetrations. In some systems, intumescent materials and devices are used to squeeze the pipe shut, cutting off the path of the fire and the flow of hot gasses. In others, portions of the plastic pipe system are replaced with metallic elements. In all cases, the safest bet is a tested and approved design. Putting the squeeze on metallic pipes does no good! The fact is that once stub-ups have been installed, there simply is no practical way of firestopping them. The strongest of intumescent materials can’t close off a metallic pipe. Tested devices utilizing a partial replacement of metallic
pipes, often use internal mechanical devices to block off the interior of the pipe in the event of a fire. The most cost effective way to do the job is also the safest!

If you consider the cost and complexity of intermixing elements of metallic systems with plastic piping, it’s far easier and more cost effective to stay with plastic throughout. Tested systems now provide cost effective firestopping systems for virtually all types of construction. With tested, cost effective solutions in hand, there’s no logical reason to do it any other way!

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User Guide: North America

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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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STI’s Wood Frame fire & smoke products

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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.

 CAD Detail Sheets

Detail sheets are documents grouped together with the most commonly used systems in five categories. These files can be downloaded as either a PDF or DWG file.

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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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 STI Guide Specifications

 Data Sheets

Penetrations

  1. Caulks, Sealants & Putties
    Product
    Product Data Sheet
    Safety Data Sheet
    SSS Intumescent Sealant
    pdf_icon_small
    pdf_icon_small
    LCI Intumescent Sealant
    pdf_icon_small
    pdf_icon_small
    SIL Silicone Sealant (Non-Sag)
    pdf_icon_small
    pdf_icon_small
    SIL Silicone Sealant (Self-Leveling)
    pdf_icon_small
    pdf_icon_small
    PEN200 Silicone Foam
    pdf_icon_small
    pdf_icon_small
    WF Caulk
    pdf_icon_small
    pdf_icon_small
    LC Endothermic Sealant
    pdf_icon_small
    pdf_icon_small
    SSP Putty
    pdf_icon_small
    pdf_icon_small
    SSP Putty Pads
    pdf_icon_small
    pdf_icon_small


  1. Collars, Wrap Strip & Cast-In
    Product
    Product Data Sheet
    Safety Data Sheet
    CID Cast-In Firestop Device
    pdf_icon_small
    pdf_icon_small
    SSC Intumescent Firestop Collars
    pdf_icon_small
    pdf_icon_small
    LCC Intumescent Firestop Collars
    pdf_icon_small
    pdf_icon_small
    RTC Intumescent Firestop Collars
    pdf_icon_small
    pdf_icon_small
    BLU Wrap Strip
    pdf_icon_small
    pdf_icon_small
    BLU2 Wrap Strip
    pdf_icon_small
    pdf_icon_small
    BLU220, BLU230, BLU240 Wrap Strip
    pdf_icon_small
    pdf_icon_small
    RED Wrap Strip
    pdf_icon_small
    pdf_icon_small
    RED2 Wrap Strip
    pdf_icon_small
    pdf_icon_small
    SSW125, SSW250, SSW375 Wrap Strip
    pdf_icon_small
    pdf_icon_small


  1. EZ-Path Fire-Rated Pathways
    Product
    Product Data Sheet
    Safety Data Sheet
    EZ-Path 44+
    pdf_icon_small
    pdf_icon_small
    EZ-Path 33
    pdf_icon_small
    pdf_icon_small
    EZ-Path 22
    pdf_icon_small
    pdf_icon_small
    EZ-Path Retrofit Device
    pdf_icon_small
    pdf_icon_small
    EZ Firestop Grommet
    pdf_icon_small
    pdf_icon_small


  1. Electrical & DataCom Cabling
    Product
    Product Data Sheet
    Safety Data Sheet
    EZ-Path 44+
    pdf_icon_small
    pdf_icon_small
    EZ-Path 33
    pdf_icon_small
    pdf_icon_small
    EZ-Path 22
    pdf_icon_small
    pdf_icon_small
    EZ-Path Retrofit Device
    pdf_icon_small
    pdf_icon_small
    EZ Firestop Grommet
    pdf_icon_small
    pdf_icon_small
    SSS Intumescent Firestop Sealant
    pdf_icon_small
    pdf_icon_small
    LCI Intumescent Firestop Sealant
    pdf_icon_small
    pdf_icon_small
    SSB Intumescent Firestop Pillows
    pdf_icon_small
    pdf_icon_small
    Composite Sheet
    pdf_icon_small
    pdf_icon_small
    SSM Firestop Mortar
    pdf_icon_small
    pdf_icon_small
    Electrical Box Insert
    pdf_icon_small
    pdf_icon_small
    SSP Putty
    pdf_icon_small
    pdf_icon_small
    SSP Putty Pads
    pdf_icon_small
    pdf_icon_small
    FP Intumescent Firestop Plug
    pdf_icon_small
    pdf_icon_small
    Ready® Sleeve
    pdf_icon_small
    pdf_icon_small
    Ready® Split Sleeve
    pdf_icon_small
    pdf_icon_small
    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Wall – Blue)
    pdf_icon_small
    pdf_icon_small
    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Wall – White)
    pdf_icon_small
    EZ-Path® Series 33NEZ Smoke and Acoustical Device (Ceiling)
    pdf_icon_small
    pdf_icon_small
    EZ-Path® Series 44NEZ Smoke and Acoustical Device
    pdf_icon_small
    pdf_icon_small


  1. Electrical Circuit Protection
    Product
    Product Data Sheet
    Safety Data Sheet
    Cable Spray
    pdf_icon_small
    pdf_icon_small
    E-Wrap™
    pdf_icon_small
    pdf_icon_small
    Thermal Barrier Wrap
    pdf_icon_small
    pdf_icon_small


  1. Outlet & Panel Box Protection
    Product
    Product Data Sheet
    Safety Data Sheet
    Electrical Box Insert
    pdf_icon_small
    pdf_icon_small
    SSP Putty
    pdf_icon_small
    pdf_icon_small
    SSP Putty Pads
    pdf_icon_small
    pdf_icon_small
    Thermal Barrier Wrap
    pdf_icon_small
    pdf_icon_small


  1. Large Opening
    Product
    Product Data Sheet
    Safety Data Sheet
    SSB Intumescent Firestop Pillows
    pdf_icon_small
    pdf_icon_small
    Composite Sheet
    pdf_icon_small
    pdf_icon_small
    SSM Firestop Mortar
    pdf_icon_small
    pdf_icon_small


  1. Packing/Forming 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
    pdf_icon_small


  1. Other
    Product
    Product Data Sheet
    Safety Data Sheet
    FyreFlange HVAC Firestop Angle
    pdf_icon_small
    pdf_icon_small
    Closet Flange Firestop Gasket
    pdf_icon_small
    pdf_icon_small

Construction Joints

  1. Joint Sprays
    Product
    Product Data Sheet
    Safety Data Sheet
    AS200 Elastomeric Spray
    pdf_icon_small
    pdf_icon_small
    Fast Tack® Firestop Spray
    pdf_icon_small
    pdf_icon_small


  1. Joint Sealants
    Product
    Product Data Sheet
    Safety Data Sheet
    SSS Intumescent Firestop Sealant
    pdf_icon_small
    pdf_icon_small
    LCI Intumescent Firestop Sealant
    pdf_icon_small
    pdf_icon_small
    SIL Silicone Sealant (Non-Sag)
    pdf_icon_small
    pdf_icon_small
    SIL Silicone Sealant (Self-Leveling)
    pdf_icon_small
    pdf_icon_small
    ES Elastomeric Firestop Sealant
    pdf_icon_small
    pdf_icon_small
    LC Endothermic Firestop Sealant
    pdf_icon_small
    pdf_icon_small


  1. SpeedFlex Joint Protection
    Product
    Product Data Sheet
    Safety Data Sheet
    SpeedFlex® TTG Track Top Gasket
    pdf_icon_small
    pdf_icon_small
    SpeedFlex® Joint Profile System
    pdf_icon_small
    pdf_icon_small

Curtain Wall

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


  1. All Weather Firestop Sprays
    Product
    Product Data Sheet
    Safety Data Sheet
    Fast Tack® Firestop Spray
    pdf_icon_small
    pdf_icon_small


  1. Anchor Protection
    Product
    Product Data Sheet
    Safety Data Sheet
    Connection Protection
    pdf_icon_small
    pdf_icon_small


  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
    pdf_icon_small


  1. Quick Clip Insulation Hangers
    Product
    Product Data Sheet
    Safety Data Sheet
    Quick Clip™
    pdf_icon_small
    pdf_icon_small
    Quick Clip™ L-Bracket
    pdf_icon_small
    pdf_icon_small

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
    pdf_icon_small
    EZ-Path® Series 44NEZ Smoke and Acoustical Device
    pdf_icon_small
    pdf_icon_small


  1. Sealants & Sprays
    Product
    Product Data Sheet
    Safety Data Sheet
    Application Data Sheet
    Smoke N Sound Acoustical Spray
    pdf_icon_small
    pdf_icon_small
    pdf_icon_small
    Smoke N Sound Acoustical Sealant
    pdf_icon_small
    pdf_icon_small
    pdf_icon_small

Fireblocking/Draftstopping

  1. SmokeBlock
    Product
    Product Data Sheet
    Safety Data Sheet
    SmokeBlock® 136
    pdf_icon_small
    pdf_icon_small
    SmokeBlock® 200
    pdf_icon_small
    pdf_icon_small

 Approval Information

 Specification Review Services

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

Let our firestop experts assist by reviewing your firestop specifications and making appropriate recommendations. STI provides this service free of charge.

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