Putty tape is a rubber-based sealant that’s primary purpose is sealing plumbing joints. This tape is also frequently used to protect deck joists and beams from moisture. Butyl tape is used by everyone from RVers needing to seal flanges on their roof vents to construction crews that want to create a tight seal around deck screws and fasteners. However, despite some minor downsides, this tape is still a favorite among DIY enthusiasts and construction professionals alike. Additionally, as it oxidizes with age, it may also show some discoloration, and some varieties are prone to sticking to their backing in warmer weather. One downside of solvent-based butyl tape is that exposure to chemicals like gas, turpentine, and mineral oil will break it down over time. Surfaces that butyl tape will stick to include: Additionally, it doesn’t dry out easily and retains its integrity for many years when used, saving time and money on repairs and installs.Īny surface on which you are using butyl tape should be clean and free of dust and moisture for optimal adhesion. It provides an excellent airtight and waterproof barrier that will maintain its durability and flexibility through extreme temperatures. This solvent-based sealant has a strong initial tack that allows it to instantly bond and seals most surfaces-including those where moisture is a factor. putty tape to avoid a sticky situation! What is Butyl Tape?īutyl tape is a pliable tape with a removable protective film. Here is what you need to know about butyl tape vs. Whether you’re wondering what is butyl tape? Or which tape should I use to repair my leaky camper? this guide is for you. They differ in surface adhesion, durability, and flexibility-with one tape coming out on top in all three of those categories. However, while many think these tapes are one and the same, that isn’t the case. Don’t find the Electrical Inspector requesting that you remove either product.When it comes to adhesives and sealants for home repairs, installations, and vehicle maintenance, butyl tape and putty tape are frequently favored for their ease of use and versatility. Neither foam nor duct putty should be used for construction purposes other than those originally intended. It doesn’t fully cure in thick layers or enclosed spaces. It creates a lightweight, open-cell structure that allows water and moisture to pass through, much like a sponge. Bottom line is duct putty fails.Ĭanned foam is designed for crack and crevices. Putty holds minimal water head pressure, compresses under large cable weight and typically had no test reports showing cable jacket compatibility. When used in conduits it sags over tine and creates openings in seals when cables and wires move. Duct putty is intended to seal around junction boxes and flashings. The most widely used product to seal conduits is duct putty. FSTTM sealant is chemically resistant to gasoline, oils, dilute acids and bases, and most unsaturated hydrocarbons. Polywater® FSTTM is superior to both duct putty and aerosol cans of foam because it has been tested for cable compatibility holds 22 feet of water head pressure continuously and up to 90 feet intermittently prevents gas from passing through does not sag will not dry out and is re-enterable. Polywater® FSTTM Foam Duct Sealant meets and exceeds the NEC section requirements for sealing conduit systems. Informational Note: Presence of hazardous gases or vapors may also necessitate sealing of underground conduits or raceways entering buildings. Conduits or raceways through which moisture may contact live parts shall be sealed or plugged at either or both ends. Sealants shall be identified for use with the cable insulation, shield, or other components. Spare or unused raceways shall also be sealed. Where a service raceway enters a building or structure from an underground distribution system, it shall be sealed in accordance with 300.5(G). Where a raceway enters a building or structure from an underground distribution system, it shall be sealed in accordance with 300.5(G). It also requires sealants to be compatible with cable jackets and other components as referenced in the sections below. The NEC states that conduits and raceways should be sealed to prevent moisture, hazardous gases and vapors from entering buildings.
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