What Is Caulk? Discover the Definition, Types, Uses, and Alternatives

If you’re planning a bathroom remodel or kitchen renovation, you’re probably going to go through a few tubes of caulk in the process—but what is caulk, exactly? And how is it different from other materials, like sealant and grout? Let’s look at the basics behind this common building material, including what it is, how much it costs, and where to use it.

What Is Caulk?

Caulk is a flexible substance used to fill gaps or create bonds between different surfaces or building materials on the interior or exterior of your home. It’s commonly applied to windows, doors, and plumbing fixtures (such as bathtubs and sinks) to prevent air leaks and water damage.

It most often comes in a tube that you insert into a caulking gun when you’re ready to apply it. There are also squeezable and pressurized tubes of caulk, which don’t always require a caulking gun.

Types of Caulk

There are several types of caulk, including:

• Acrylic latex caulk

• Silicone caulk

• Polyurethane-based caulk 

• Butyl rubber caulk

Each type of caulk is different, and it’s important to choose the right kind based on the project you’re tackling. For example, the best caulk for showers isn’t necessarily going to be the best caulk for baseboards. If you aren’t sure which type you need, reach out to a local caulking company for advice on your specific project.

Where to Use Caulk Around Your Home

Caulk is a versatile product that’s effective for indoor and outdoor projects. Some of the most common uses of caulk include:

• Sealing drafty windows or doors

• Preventing mold growth in showers and tubs

• Closing gaps around baseboards or moldings

• Patching small holes or cracks in interior walls

• Reapplying loose carpet or wallpaper

• Repairing roof shingles or flashing

• Filling gaps on the exterior of your home to prevent pests from entering

How Much Does Caulk Cost?

If you hire a pro, the cost of caulk will depend on the size of the area they’re caulking and whether they need to remove old caulk. On average, though, professional caulking costs between $65 and $300 for a bathtub or shower or $50 to $70 per window.

Alternatively, you can save money by learning how to apply caulk yourself. Overall, it’s fairly straightforward (although it’ll take some practice to master the motions), but some caulking projects are more complicated or dangerous than others. 

For example, caulking a shower is a DIY-friendly task, but climbing onto your roof to replace loose shingles isn’t quite so simple. For these sorts of specialized or high-risk projects, we recommend calling a handyperson or caulking pro.

Caulk vs. Similar Materials

If you don’t have much DIY experience, it’s easy to confuse caulk with other materials, like sealant and grout. However, each of these products serves a different purpose, so it’s important to understand which one you’ll need for your job. Here are some of the primary differences between caulk and similar materials.

Caulk vs. Sealant 

Caulk and sealant have similar uses and application methods, which explains why the terms are often used interchangeably. However, sealant is more elastic and less rigid than caulk. As a result, sealant is a better option for spaces that experience lots of movement. 

Caulk vs. Grout

Grout is a cement-based material that goes between tiles to prevent them from shifting. When it comes to grout versus caulk, grout is harder than caulk when it dries, making it the better pick for keeping tile floors, walls, and backsplashes in place. On the other hand, caulk is useful for sealing gaps between different materials (for example, a tile wall and countertop).