What Caulk To Use When Installing A Faucet?

silicone caulk for faucet

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If you are planning to install a new faucet in your kitchen or bathroom, you might be wondering what kind of caulk to use for the job. Caulk is a sealant that helps prevent water from leaking under the faucet and causing damage to the sink or countertop. Caulk also helps secure the faucet in place and gives it a neat and finished look.

But not all caulk is created equal. There are different types of caulk for different purposes and surfaces. In this article, I will explain what caulk to use when installing a faucet and how to apply it correctly.

The Best Caulk for Faucet Installation

The best caulk for faucet installation is silicone caulk. Silicone caulk is a waterproof and flexible sealant that can withstand high temperatures and moisture. It is also resistant to mold and mildew, which can grow in damp areas like sinks and faucets.

Silicone caulk comes in clear or colored varieties, depending on your preference and the color of your faucet and sink. You can find silicone caulk labeled as kitchen and bathroom caulk or tub and tile caulk at most hardware stores.

You should avoid using acrylic latex caulk for faucet installation. Cause it is not waterproof and can crack or peel over time. Acrylic latex caulk is better suited for interior projects that do not require water resistance.

Some people may use plumber’s putty instead of caulk for faucet installation, but this is not recommended either. Plumber’s putty is a soft and pliable substance that can be easily molded and removed. It is good for sealing drains and pipes, but not for faucets.

Plumber’s putty does not adhere well to surfaces and does not create a tight seal. Plumber’s putty can also stain some materials, such as granite or marble countertops. It also does not offer any extra security for the faucet, unlike silicone caulk.

How to Apply Caulk When Installing a Faucet

Applying caulk when installing a faucet is not difficult, but it requires some preparation and precision. Here are the steps to follow:

  1. Shut off the water supply to the faucet by turning off the valves under the sink or the main water supply for the house. Turn on the faucet to release any pressure and let it drain completely.
  2. Remove the old faucet by disconnecting the water supply lines with an adjustable wrench and unscrewing the mounting nuts under the sink with a basin wrench. Lift the faucet from the sink and use a putty knife to scrape off any old caulk or gasket residue from the sink surface.
  3. Clean the sink surface with a cleaner appropriate for your sink material, such as mineral spirits or rubbing alcohol. Make sure the surface is dry before applying caulk.
  4. Apply a bead of silicone caulk around the bottom of the new faucet or around the faucet holes on top of the sink, depending on your instructions. Use a caulking gun to squeeze out a thin and even line of caulk, about 1/8 inch thick. You can also use your finger to smooth out the caulk if needed.
  5. Place the new faucet over the sink holes and align it with the gasket if provided. Press down firmly to make sure the caulk adheres well to both surfaces.
  6. Secure the new faucet by attaching the water supply lines with an adjustable wrench and tightening the mounting nuts under the sink with a basin wrench. Make sure not to overtighten them, as this can damage the faucet or cause leaks.
  7. Wipe off any excess caulk with a damp cloth or paper towel before it dries. You can also use a utility knife to trim off any dried caulk if needed.
  8. Turn on the water supply and check for any leaks around the faucet or under the sink. If you find any leaks, turn off the water supply again and tighten or adjust the connections as needed.

Common FAQ

Do you use silicone or caulk for faucet?

When it comes to sealing faucets, opting for silicone sealant is a wise decision. Available in tube form, silicone faucet sealant features a long applicator for more precise application, allowing you to apply it easily and accurately in a circular shape around the base.

When should you not use silicone caulk?

While many people believe that extreme temperatures are the biggest threat to silicone sealant, in reality, moisture is the most detrimental factor. It’s crucial to ensure the surface you’re sealing is completely dry before applying the sealant because any residual moisture will compromise the integrity of the seal. Applying silicone sealant in rainy, snowy, or foggy conditions is not recommended, as the excess moisture will interfere with the sealant’s ability to adhere properly.

Does plumbers putty crack?

Plumber’s putty is a malleable substance that is applied to create leak-proof seals around various plumbing components such as faucets and drains. It contains oils that give it a soft and pliable consistency, ensuring that it remains flexible over time and doesn’t dry out or develop cracks.


Installing a new faucet can give your kitchen or bathroom a fresh look and improve its functionality. But to ensure a successful installation, you need to use the right kind of caulk for the job. Silicone caulk is the best option for faucet installation, as it is waterproof, flexible, and resistant to mold and mildew. You should avoid using acrylic latex caulk or plumber’s putty, as they are not suitable for this purpose. To apply caulk correctly, you need to shut off the water supply, remove the old faucet, clean the sink surface, apply a bead of silicone caulk around the faucet or the holes, place the new faucet, secure it with nuts and lines, wipe off any excess caulk, and check for any leaks.

Debra Klein

My name is Debra & I love modern kitchen designs! I am a passionate product reviewer who wants to assist homeowners in picking the right modern kitchen accessories for their home. My mission is to give the best solution that will help my readers to choose the best and right kitchen items for their homes.

About Me

DonnaHi, my name is Debra Klein and I love modern kitchen designs! As a product reviewer, it’s my mission to help homeowners choose the right modern kitchen accessories for their homes. I want to give them the best solution possible so they can make the best decision for their needs. Thanks for reading!

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