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Just Bead It! Sealing the Point Contact Location

UL Systems that permit point contact will often specify a bead of sealant to be applied at the point contact location between penetrant and periphery of the opening. The UL Systems somewhat generically list the sealant applied at that location as a bead having a minimum diameter. This can sometimes cause confusion.

To begin, let’s very quickly talk about annular space. UL Systems will always indicate if the penetrant must be centered within the opening (i.e. concentric installation) or if it can be installed eccentrically (i.e. offset). Some systems permit the penetrant to be installed either concentrically or eccentrically. The resulting gap between the penetrant and the periphery of the opening is the annulus or annular space. Systems will sometimes provide a range of annular space such as minimum 0” to maximum 2”. When it comes to listings, there are two conditions where the penetrant will contact the periphery of the opening (i.e. 0” annular space). These are described as “point contact” (Figure 1) and “continuous point contact” or “continuous contact” (Figure 2). There is a distinction; if the system allows point contact, the penetrant can contact a single side of the opening. Of course, the amount of the penetrant that may contact the periphery of the opening can vary based on the diameter or dimensions of the penetrant. Think about it in terms of a smaller pipe in a larger opening or a larger pipe in a proportionally tighter opening; the amount of contact is going to vary, but it still results in a single point of contact. Continuous contact, by contrast, is where the penetrant (e.g. a pipe or conduit) contacts the opening on all sides (e.g. 360-degree contact for round object in a round opening). A system that lists “point contact” does not permit “continuous contact” unless explicitly stated.

When point contact exists, it should be sealed with a bead of sealant to ensure that the seal is a continuous membrane. This also helps to prevent the free passage of hot gases and smoke, and for purposes of ASTM E814 and ANSI/UL1479, it allows the system to pass the hose stream portion of the test by restricting the passage of water beyond the unexposed side.

Applying a bead of sealant seems like an easy thing, but when it comes to ensuring compliance, the vagueness of the description in the listings can
sometimes make this task difficult. So what kind of bead is required? According to the UL Systems, it is often stated to be a minimum diameter (Figure 3). And this would be true if the sealant were not tooled. More accurately, the bead applied at point contact is a fillet bead (Figure 4). The bead is applied initially to a specific diameter (e.g. ¼”), but it is then tooled to form the fillet bead. For water-based products, this is often done with a swipe of the finger. For silicones or urethanes that may be stickier, a tooling knife or even a plastic spoon may be used. Often the illustrations will show the desired profile, which is more triangular when viewed as a cross-section. If an inspector wanted to measure the point contact bead, they might cut into it to verify the bond between pipe and substrate. In the case of a ¼” bead, it might more accurately measure as a ¼” x ¼” fillet bead. Keep in mind that it may be unnecessary to destructively test that portion of the seal. Often bond can be measured by simply pushing a thumb into the seal at that location to ensure that it stays adhered to both penetrant and substrate.

One last note… while tooling is a good practice, it also may not be required. If the installer applied a continuous bead of sealant that adhered to
both penetrant and substrate, it would certainly satisfy the test requirements. It might not look as aesthetically desirable, but functionally, it would still perform.

Systems with Packing Material
Any discussion on point contact will invariably trigger the discussion on packing materials. Some systems require a packing material as an integral component. A common packing material is mineral wool, although glass or ceramic fiber may also be used in some systems. To confirm, there is no packing material behind the penetrant at the point contact location. The packing material is often wedged up as close as possible to the sides of the penetrant where it contacts the periphery of the opening. In some cases, the prescribed depth of packing material at these locations may be less than specified in the system due to the physical limitations of hand-packing the material into said location. Additionally, when doing an inspection of the packing material prior to sealant installation, a void space may be observed (Figure 5). This small void space is covered with the sealant that is applied as a fillet bead atop it.

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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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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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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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 Data Sheets

Penetrations

  1. Caulks, Sealants & Putties
    Product
    Product Data Sheet
    Safety Data Sheet
    SSS Intumescent Sealant
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    LCI Intumescent Sealant
    pdf_icon_small
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    SIL Silicone Sealant (Non-Sag)
    pdf_icon_small
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    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
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    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
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    RTC Intumescent Firestop Collars
    pdf_icon_small
    pdf_icon_small
    BLU Wrap Strip
    pdf_icon_small
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    BLU2 Wrap Strip
    pdf_icon_small
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    BLU220, BLU230, BLU240 Wrap Strip
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    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
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  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)
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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
    Product
    Product Data Sheet
    Safety Data Sheet
    Cable Spray
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    E-Wrap™
    pdf_icon_small
    pdf_icon_small
    Thermal Barrier Wrap
    pdf_icon_small
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  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
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    SSP Putty Pads
    pdf_icon_small
    pdf_icon_small
    Thermal Barrier Wrap
    pdf_icon_small
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  1. Large Opening
    Product
    Product Data Sheet
    Safety Data Sheet
    SSB Intumescent Firestop Pillows
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    Composite Sheet
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    SSM Firestop Mortar
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  1. Packing/Forming Materials
    Product
    Product Data Sheet
    Safety Data Sheet
    STI-SSAMW
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    IIG (JM)-Type CW8
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    IIG (JM)-Minwool 1200 Safing
    pdf_icon_small
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    Owens Corning Thermafiber-Firespan 40 & 90
    pdf_icon_small
    pdf_icon_small
    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
    pdf_icon_small
    pdf_icon_small
    ROCKWOOL-CurtainRock 40
    pdf_icon_small
    pdf_icon_small
    ROCKWOOL-CurtainRock 80
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    pdf_icon_small
    Roxul-Safe
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  1. Other
    Product
    Product Data Sheet
    Safety Data Sheet
    FyreFlange HVAC Firestop Angle
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    Closet Flange Firestop Gasket
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Construction Joints

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

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