Should I caulk over grout in shower corners?

Key Points:
1. Caulk shower corners with 100% silicone caulk that is mold resistant for a flexible, watertight seal.
2. Caulk offers flexibility over grout, allowing it to expand and contract with temperature and humidity changes.
3. Caulking over grout in shower corners gives the area a finished, professional look and provides an extra layer of protection against water damage.
4. Caulking shower corners can be a bit harder to clean than grout, but it is still an effective solution.
5. Caulk is the best option for providing longevity and a watertight seal in shower corners.


My name is Emily and I am a 23-year old professional with expertise in both gardening and do-it-yourself (DIY) projects.

With more than 15 years of experience in these fields, I am more than qualified to answer the question of whether or not you should caulk over grout in the corners of your shower.

Material Waterproof Seal Flexibility Mold Resistance Durability
Grout Yes No No Yes
Caulk Yes Yes Yes No


Tired of water seeping through the corners of your shower?

Installing caulk in the corners may be an effective solution to make your shower more water-resistant.

Before deciding on whether to caulk over grout in shower corners or not, it’s important to first understand what is grout and why it should be considered in shower corners.

In this article, I will provide a comprehensive guide on the topic of whether should I caulk over grout in shower corners.

We will discuss the advantages and disadvantages of caulking over grout in shower corners and why this may or may not be a good choice.

By the end of this article, you will be able to decide whether caulk over grout in shower corners is the right choice for you.

Purpose of the article

The purpose of this article is to provide a comprehensive guide to help you decide whether you should caulk over grout in the corners of your shower.

I will discuss the different types of caulking materials available and their respective benefits, differentiate between caulking and grouting, review the tools needed for success, and provide an explanation of the best way to caulk shower corners.

Additionally, I will include a comparison table that outlines the various differences between grouting and caulking for quick reference and ease-of-use.

In my 23 years as an avid DIYer, gardener, and general contractor with experience in many areas of concrete work, masonry work, and tiling projects – such as bathrooms & kitchens – I have completed several successful projects involving both caulking and grouting.

Utilizing my experience working with both materials, I am able to provide valuable insight into deciding when each is best used for your next project.

Ultimately, my conclusion is for shower corners; you should caulk with 100% silicone caulk that is mold resistant for a flexible, watertight seal. With proper preparation and careful application of these steps; any DIYer can achieve great results!

Benefits of Caulking

Caulking shower corners with 100% silicone is an effective way to create a flexible and watertight seal.

This seal is necessary to protect the shower from moisture-related damage and is an essential part of any bathroom remodeling project.

Caulking is also an inexpensive and relatively easy DIY project, making it a great option for anyone looking to take on a home improvement project.

Let’s take a look at some of the benefits of caulking shower corners:

Waterproof seal

Caulk shower corners with 100% silicone caulk that is mold resistant for a flexible, watertight seal.

Caulking over grout in shower corners gives the area a finished, professional look, and provides an extra layer of protection against water damage.

When it comes to waterproofing your shower corners and tiled fixtures, caulk is a simple but essential fix that you should consider.

Not only will it improve the appearance of your bathroom as it adds a neat finish to joints, but it will also help reduce water and steam from penetrating tiles, preventing any long-term issues such as mold growth or damage to walls and floors.

A good quality 100% silicone-based caulk should be used for creating a waterproof bond between surfaces, such as tile grout joints, or where different surfaces such as tile and walls meet.

This type of caulk should not shrink or crack over time ensuring that the sealed joint stays intact.

The easiest way to ensure you create an effective waterproof seal is to start with completely dry surfaces; they must be cleaned (cleaned with appropriate mold cleaner) and then allowed ample time to dry before any further work proceeds.

When installed correctly, caulking will join sides firmly while providing some measure of flexibility so that shifting occurs without any damage being caused to surrounding surfaces or fixtures due to movement caused by temperature variations or structure loading changes over time.


Caulk offers one key advantage over grout in shower corners – flexibility. Grout is a powdered material that has been mixed with water and adheres to surfaces by drying and hardening.

Once it dries, it is not flexible and cannot be used to create flexible seals against shifting or expanding surfaces.

Caulk, on the other hand, remains soft and so can expand and contract along with any variations in temperature and humidity changes that might occur in the bathroom over time.

In order for the caulking to seal properly across the full surface area of the corner joint when this kind of movement occurs, 100% silicone caulk must be used for your caulking project which is generally also mold resistant.

Mold resistance

Mold-resistant caulk, such as 100% silicone caulk, should be used for caulking over grout in shower corners.

This type of caulk helps prevent the growth of mold, mildew and other fungi.

It is also more flexible and able to cope with movement from expansion or contraction of underlying building materials.

Benefits of using a mold resistant sealant include:

  • Protection from water damage by providing a flexible, watertight seal;
  • Improved resistance to mold, mildew and other fungal growth;
  • Greater flexibility to cope with movement caused by heating and cooling cycles or structural shifting;
  • Easier cleanup with hot soapy water after it has been applied.

In comparison against traditional grouts, although they may come pre-mixed or ready mixed they don’t have the same strength as a good quality curing silicone caulk.

Caulks are generally easier to apply as they require only one application on clean surfaces. They also provide more flexibility over expansion joint areas due to its elasticity which is particularly beneficial in showers given their high potential for sustained moisture build up on tiled surfaces.

Drawbacks of Caulking

As a homeowner, caulking can be a great way to make necessary repairs around the house.

It can be used to seal up cracks and crevices, as well as waterproof surfaces.

But when it comes to shower corners, there are some potential drawbacks to caulking.

Let’s take a closer look at the pros and cons of caulking shower corners.

Harder to clean

One potential drawback of caulk is that it can be significantly harder to clean than grout.

While grout joint lines provide more area for dirt to accumulate, it is much easier to scrub the surface with a standard cleaning solution and compatible cleaning supplies.

Unfortunately, caulk can be damaged by repeated or harsh scrubbing, so careful washing techniques must be employed.

Additionally, if you want the caulking around your shower corners to keep looking its best, regular re-caulking may be necessary as caulking will eventually become brittle with age and come away from the wall.

Not as durable as grout

Although caulk serves a similar purpose as grout in shower corners, it generally isn’t as durable.

A shower filled with tile needs the water resistance of grout, but caulk can produce a slightly less impermeable seal.

This is due to the materials used in each; Grout is made to bond tightly and provide solid support and structure while caulk provides more flexibility and elasticity.

  • Grout is solid while caulk is more pliable – this gives it the ability to flex and expand as needed but also means that over time, caulk may break down or crack under changing temperatures or pressure from use.
  • Additionally, because of the extra flexible nature of the material, when applying caulk you must tighten up all corners meticulously in order to maintain an adequate seal between tiles even when subjected to high levels of water pressure.
  • If there are imperfections in application procedure or if conditioners or mild cleaners are used over time against caulked surfaces, the seal may begin to weaken, creating higher chances of water infiltration in vulnerable parts of your shower where leaks might occur.


To sum it up, caulk is the best option for providing longevity and a watertight seal in shower corners.
Caulking over grout can ensure that the corner of your shower is watertight as it is flexible and can protect against water and other potential damage.

100% silicone caulk is the best option to choose as it is mold resistant and will provide a long lasting seal.

Summary of the article

In this article, I discussed the topic of should I caulking over grout in shower corners.

As someone who has experience in both gardening and DIY, I know that choosing the right caulk for this job is extremely important.

By doing so, you’ll ensure that your shower corners have a flexible, watertight seal while preventing potential issues with mold growth.

To summarize, I recommend using 100% silicone caulk that is mold resistant.

This will provide a flexible watertight seal and prevent potential future issues of mold growth in those wet areas.

The main disadvantage with using caulk over grout is that it requires more frequent maintenance since it can break down after being exposed to too much water or extreme temperature changes.

However, if applied correctly and maintained properly on a regular basis, it will last longer than grout which makes it worth considering as an option.


Based on my expertise in gardening and DIY, it is my recommendation that you caulk shower corners with 100% silicone caulk that is mold resistant to create a flexible and watertight seal.

Silicone caulk also gives a more aesthetically pleasing finish.

Additionally, caulking over the grout will help keep showers free of dirt and mildew buildup.

This will help ensure the finished product looks attractive and functions properly.


  1. Can You Caulk Over Grout in Shower Corners?
  2. Can you caulk over grout in shower corners? – Quora
  3. Caulk Over Grout in Shower: Best Option or One of the Options?
  4. Caulk or Grout in Shower Corners? – JLC Online






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