Emilie Meyer
Gaps between shower pans and wallboards can be caused by poor silicone sealant placement, cracked pans, or faulty drain seals. While some gaps are intentional, others may require repairs to prevent water damage. Filling the gap with caulk or grout is an option, but the former is preferable as it is a sealant, whereas grout is part of the structure that holds tiles to walls. Before caulking, ensure the gap is clean and dry.
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What You'll Learn
Filling the gap with caulk or grout
Filling the gap between the shower pan and the wallboard depends on the size of the gap. A gap of about 1/4 inch is recommended between the backer board and the shower pan to prevent the shower pan from cracking due to pressure or changes in temperature, weight, and age. This gap also helps to prevent water damage.
Caulk and grout are used for different purposes. Caulk is a sealant, while grout is used for adhering tiles to the wall. Caulk is temperature resistant but can become unreliable over time as it dries up. Grout, on the other hand, will not be worn down by water.
If you choose to fill the gap with caulk, the first step is to collect your materials. You will need a caulking tube, a caulking gun, and a utility knife. Cut the tip of the caulking tube at a 45-degree angle, load it into the caulking gun, and maintain a firm grip on the handle. Extrude the caulk along the seam at a gradual and consistent pressure rate. Use gloved fingers or a silicone tool to smooth the caulk after application. Push the caulk into the seam to create a more aesthetically pleasing connection.
If you are filling a smaller gap, you can use a setting-type compound rather than a drying-type, as it is more water-resistant. You can also use grout to fill the gap, although this is not recommended as it can cause issues.
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Using DensShield or cement board
DensShield is considered by some to be a better option than cement board for fixing the gap between a shower pan and wallboard. This is because DensShield has a facing applied and wicks one-third as much water in a test. DensShield also has a gypsum silicone core and a waterproof surface.
If you are using DensShield, the manufacturer's instructions advise leaving an 1/8-inch gap between the shower pan and the DensShield edge, and then caulking this gap.
If you are using cementitious backer board, you need to waterproof it. You can do this by applying a waterproof membrane over it, or by using a liquid-applied membrane that is breathable.
If you are using cement board, you should ensure there is a 1/4-inch gap between the pan and the board. This gap can then be filled with caulk.
If you are using a cement board, some suggest doubling up the layers, using longer screws to reach the studs.
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Shimming to make the shower pan level
Shimming is a process that can be used to level a shower pan. It is a good option if you want to avoid the hassle and time required for laying a mortar base.
To begin the shimming process, place the level across the top edges of the pan and check for level. If the shower pan is not level, place wood shims underneath the shower pan in the corresponding areas. The shims are held in place by the weight of the pan. Tap the pan with a rubber mallet if you need to make slight adjustments once the shims are placed. The pan is also screwed onto the wall studs through the flanges of the pan. Double-check everything before setting the screws.
It is important to note that wood shims can rot and collapse over time. Plastic shims are a better alternative as they avoid the possibility of wood rot. However, shimming may not always be the best solution. In some cases, severe flexing can stress the drain fittings and cause leaks. Therefore, some plumbers prefer to use a mortar bed even when the manufacturer does not specify it.
Additionally, it is recommended to fill the gap between the shower pan and the backer board with caulk. Caulk provides a watertight seal and prevents water damage. Grout can also be used, but it may cause issues and is not meant for adhering tile directly to a solid surface.
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Fixing the wall before installing the backer
When preparing to install a new shower, it is important to ensure that the wall is properly prepared to support the shower pan and backer board. Here are the steps to follow for fixing the wall before installing the backer:
Firstly, it is crucial to waterproof the shower walls. This step is essential to prevent water damage and maintain the integrity of the shower. The waterproofing membrane should extend up the wall studs by several inches, and the finished height of the floor must be determined before waterproofing.
Next, the shower pan should be installed. Ensure that the shower floor is straight and level as you nail it to the studs. This step will create a small lip, flange, or ledge at the bottom of the shower walls, which will serve as a guide for installing the wallboard. The wallboard should be placed so that its bottom edge is parallel to the shower pan, creating a gap of approximately 1/4 inch between the pan and the backer panel. This gap is necessary to allow for expansion and contraction of the materials, preventing water from seeping behind them and causing damage.
Before installing the backer board, it is important to address any gaps or imperfections in the wall. One option is to use a cement backer board or a synthetic backer board to fill in any voids or gaps. The seams and bottom edge can be skimmed with fast-setting hydraulic cement or ceramic tile thin-set mortar. Once dry, the area should be painted with an elastomeric waterproof coating for added protection.
Additionally, it is recommended to use spacers to ensure that the desired gap size is achieved. Caulk or silicone can be used to fill the gap between the shower pan and the backer board, providing a waterproof seal. However, caulk requires occasional maintenance and replacement, as it can dry up and lose its waterproofing properties over time.
By following these steps, you can ensure that the wall is properly prepared before installing the backer, resulting in a sturdy and watertight shower enclosure.
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Adding a second layer of cement board
If you are looking to fix the gap between your shower pan and wallboard by adding a second layer of cement board, there are a few key steps to follow. Firstly, it is important to ensure that you have the right materials and tools for the job. You will need longer screws for the second layer of cement board to reach the studs.
Before installing the second layer of cement board, you should prepare the area by waterproofing it. This is crucial to protect the wall behind the shower from water damage. You can use a waterproofing material such as a membrane that overlaps the pan, or you can apply a silicone sealant. Silicone is an excellent choice as it is versatile, long-lasting, and won't deteriorate.
Once the area is waterproofed, you can begin installing the second layer of cement board. Make sure the wall is plumb and true, and that the cement board is cut to the correct size. You may need to use a thinner board to make up for the difference in thickness. When installing the second layer, use longer screws to secure it to the studs.
After the second layer of cement board is installed, you can finish the job by tiling over it. Ensure that your tiles are adhered properly and consider using grout or caulk to fill in any gaps and create a watertight seal.
By following these steps and adding a second layer of cement board, you can effectively fix the gap between your shower pan and wallboard, creating a durable and aesthetically pleasing finish.
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Frequently asked questions
It is recommended to leave a 1/4-inch gap between the shower pan and the wallboard to prevent water damage. This gap can be filled with caulk, a sealant that is temperature resistant.
You will need a caulking tube, a caulking gun, a utility knife, and gloves or a silicone tool.
Cut the tip of the caulking tube at a 45-degree angle, load it into the caulking gun, and apply gradual and consistent pressure to extrude the caulk along the seam. Smooth the caulk with your fingers or a silicone tool.
Yes, you can use grout, silicone sealant, or a setting-type compound.
