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. It is important to understand that adherence to these limitations is at the discretion of the local authority having jurisdiction. 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. Present testing includes boxes up to 22 sq. Where the required box must be larger than the permitted 16 sq. 3 above) where stud cavities are not isolated and physical separation of boxes is impractical.Ĥ. This is a particular problem in back to back installations such as adjoining kitchens or bathrooms located on common rated walls.ģ. Where the horizontal spacing of the boxes must be less than the required 24 inches. High ceilings also can reduce the allowable amount of building services by decreasing the length of the wall required to hit the 100 sq. This restriction can be of particular importance in construction where the required concentrations of building services are very heavy (hospital rooms).
Where the aggregate area of the boxes will exceed 100 sq. When are they used? Putty pads are used in conjunction with metallic and nonmetallic electrical boxes under the following conditions:ġ. This gasket compresses between the front edge of the box and the gypsum board as the board is installed. 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.
Installing it on the other side requires some technique. Installing the pad on the side where the board is already installed is straight forward. The installation sequence is after the gypsum board is applied to one side and before it is closed in on the other side. They are applied to the back surface of the box, as well as the three sides that are away from the stud. How are they used? Putty pads, as mentioned above, are designed to be applied to the external surfaces of metallic and nonmetallic boxes. The pads are now used primarily to overcome certain restrictions on the number and placement of electrical boxes in rated gypsum wallboard assemblies. Why are they used? Over time, sound deadening has actually become a secondary use for putty pads. He requested that pads be made from a firestopping putty and thus an idea was born. 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. 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. Let’s discuss the electrical box usage first and then cover their use in through-penetration firestops. We also have used putty pads in a few systems for through-penetrations. Putty pads are designed to be applied to the external surfaces of metallic and nonmetallic switch and receptacle boxes in some rated wall conditions. What are putty pads used for? This is really the question most people ask. 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. Faced on both sides with a convenient poly liner, SpecSeal® Putty Pads are easily applied with no mess or excessive residue.One of the least publicized and most misunderstood products in the SpecSeal® line would have to be our putty pads. The pad is conveniently sized to fit a typical 1-1/2 in (38 mm) deep 4S box with no cutting or piecing required. SpecSeal® SSP Putty Pads provide this same level of protection in a release lined pad for easy application to electrical boxes or other penetrants. SpecSeal® Putty remains soft and easy to reuse or retrofit. Its aggressive adhesion makes it suitable for use with all common construction materials as well as cable jacketing and pipes.
#Putty pads install
Requiring no tools, SpecSeal® SSP Putty is soft and pliable making it easy to install by hand packing into openings. SpecSeal® Putty expands up to eight times its original size when exposed to high temperatures or flames. SpecSeal® SSP Putty is a non-hardening, intumescent compound designed to seal through-penetrations as well as certain membrane penetrations (med-gas valve box, tub & shower valve, clean-out tee) against the spread of fire, smoke, and hot gasses.
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