Register Login Logout Account
Choose Region: North America

Firestop Putty Pads – When, Where and How to Use Them

One of the least publicized and most misunderstood products in the SpecSeal® line would have to be our putty pads. At the request of several of our customers, we’re going to attempt to remove the shroud of mystery surrounding this product by answering some of the most commonly asked questions.

What are putty pads used for? This is really the question most people ask. Putty pads are designed to be applied to the external surfaces of metallic and nonmetallic switch and receptacle boxes in some rated wall conditions. We also have used putty pads in a few systems for through-penetrations. Let’s discuss the electrical box usage first and then cover their use in through-penetration firestops.

Where did this idea come from? Sound deadening pads historically have been used in some jurisdictions to meet noise abatement (sound attenuation) requirements between living units in apartments or condos. An inspector in southern California about a dozen years ago happened to pick one up at a job site and apply a lighter to it. The pad went up in flames. He requested that pads be made from a firestopping putty and thus an idea was born.

Why are they used? Over time, sound deadening has actually become a secondary use for putty pads. The pads are now used primarily to overcome certain restrictions on the number and placement of electrical boxes in rated gypsum wallboard assemblies.

How are they used? Putty pads, as mentioned above, are designed to be applied to the external surfaces of metallic and nonmetallic boxes. They are applied to the back surface of the box, as well as the three sides that are away from the stud.

The installation sequence is after the gypsum board is applied to one side and before it is closed in on the other side. Installing the pad on the side where the board is already installed is straight forward. Installing it on the other side requires some technique. The pad must be applied to the box and then either lapped over the front of the tile plate (if one is used) or excess material must be worked toward the front of the box and built up into a compressible gasket much like the pinched area of a pie crust. This gasket compresses between the front edge of the box and the gypsum board as the board is installed.

When are they used? Putty pads are used in conjunction with metallic and nonmetallic electrical boxes under the following conditions:
1. Where the aggregate area of the boxes will exceed 100 sq. in. per 100 sq. ft. of wall. This restriction can be of particular importance in construction where the required concentrations of building services are very heavy (hospital rooms). High ceilings also can reduce the allowable amount of building services by decreasing the length of the wall required to hit the 100 sq. ft. total.
2. Where the horizontal spacing of the boxes must be less than the required 24 inches. This is a particular problem in back to back installations such as adjoining kitchens or bathrooms located on common rated walls.
3. In staggered-stud walls (See Fig. 3 above) where stud cavities are not isolated and physical separation of boxes is impractical.
4. Where the required box must be larger than the permitted 16 sq. in. Present testing includes boxes up to 22 sq. in. (4-11/16” square boxes).

Using Putty Pads… Who makes the call? Putty pads are a tested method for overcoming some of the limitations suggested by the NFPA Life Safety Code. It is important to understand that adherence to these limitations is at the discretion of the local authority having jurisdiction. Thus the use of the pads and their acceptance as a means of addressing these limitations is also at the discretion of the local authority having jurisdiction. The bottom line being… Check with your local inspector before installing this product!

What about the cost? Putty pads do add cost! The pads are often more expensive than the cost of the boxes themselves. But they are less expensive than the alternatives. Some
jurisdictions require that boxes be framed in with additional studs and gypsum board. This is particularly true in walls that utilize parallel staggered stud membranes. In these walls there is no true separation between stud cavities. Putty pads also reduce cost by allowing the designer greater freedom in designing mirror image living units along rated walls.

Putty Pads in Through-Penetration Firestops
STI utilizes putty pads in some throughpenetration firestop designs. The shape of the pad as well as some of its unique properties work perfectly in solving a number of unique problems. Consider putty pads when you encounter theh following conditions:
• Isolating copper pipes… Putty pads are highly water-resistant. By breaking the path to ground, they can help prevent galvanic corrosion.
• Allow pipe movement by wrapping penetrants with putty pads prior to pouring in firestop mortar.
• Putty pads isolate plastic pipes from concrete or mortar to help speed reaction of intumescent materials.
• Lay putty pads under and over cables in tray applications to firestop and smoke seal heavy cable bundles-this is particularly effective in pillow installation.

Download PDF Here

 Industry Links

 Literature

userguide1

User Guide: North America

The perfect brochure to use as a reference tool for any STI Product on the market.

+ View Brochure PDF

userguide international

User Guide: International

Our complete product brochure designed for international markets.

+ View Brochure PDF

EZ-Path® Fire Rated Pathway

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

+ View Brochure PDF

EZ-Path® Retrofit Device

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

+ View Brochure PDF

EZ-Path® The Logical Choice

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

+ View Brochure PDF

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.

+ View Brochure PDF

Wood Frame Brochure

STI’s Wood Frame fire & smoke products

+ View Brochure PDF

Available Literature:

+ User Guide: US & Canada
+ User Guide: Europe & Middle East
+ Electrical & DataCom User Guide
+ EZ-Path® Fire Rated Pathway

Your Name (required)

Email (required)

Phone Number (required)

Company (required)

Street (required)

City (required)

State (required)

Zipcode (required)

Country (required)

Literature Request (Name and Quantity)

Additional Message

 Warranty Information

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.

Click here to generate a custom Detail Sheet.

caddetails1

Construction Joints
View PDF | View DWG

Curtain Wall
View PDF | View DWG

Electrical-DataCom
View PDF | View DWG

EZ-Path®
View PDF | View DWG

Plumbing – HVAC
View PDF | View DWG

 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.

 The Burn Newsletter