Fiberglass bathtubs and shower surrounds offer a practical, cost-effective, and aesthetically pleasing solution for modern bathroom renovations. They are lightweight, durable, and easy to install, making them a popular choice for homeowners and professionals alike. When installed correctly, these units provide a long-lasting, low-maintenance alternative to traditional tile and cast iron tubs. However, proper installation is critical to ensure water resistance, structural integrity, and overall performance.
This guide draws from verified installation instructions and best practices provided by authoritative sources, including detailed installation manuals, plumbing guides, and manufacturer recommendations. It outlines the essential steps, tools, materials, and considerations required for a successful fiberglass bathtub installation.
Preparing for Installation
Before beginning the installation process, it is crucial to assess the existing bathroom layout and prepare the area to accommodate the new fiberglass tub and shower surround. A well-planned setup minimizes the risk of installation errors and long-term issues such as leaks or poor drainage.
Assessing the Existing Setup
Begin by removing the old tub and shower. This process may involve disconnecting plumbing, removing tiles, and clearing out surrounding fixtures. During this step, it is important to inspect the underlying structure for any damage, mold, or water-related issues. According to the source material, improper framing or hidden damage can lead to complications later on, so addressing these concerns before proceeding is essential.
Once the old tub is removed, examine the plumbing for any signs of wear or inefficiency. This is also an ideal time to install a new shower valve or upgrade existing components to improve functionality and water efficiency.
Framing and Leveling
Fiberglass tubs require proper support to ensure they remain stable and level. A ledger board made of 2x4 lumber should be attached to the wall studs at a height that supports the tub beneath its flange. This board provides a secure base for the tub and ensures it is aligned correctly during installation.
Before placing the tub, it is necessary to install the drain and overflow components. These should be aligned with the pre-drilled holes in the tub. A generous coil of plumber’s putty should be wrapped around the threads of the strainer that fits into the drain hole. Once the strainer is pushed through the drain from the top, a gasket should be placed over the strainer threads on the bottom of the tub.
After aligning the drain pipe with the strainer threads, use pliers to screw the strainer into the drain assembly. A helper can assist by holding the drain and overflow part from the other side while you tighten the strainer. Any excess putty that extrudes during this process should be wiped away to ensure a clean, watertight seal.
Checking for Leaks and Proper Drainage
Before proceeding with installation, it is recommended to check for existing leaks in the area where the new tub will be installed. Signs such as warped walls, musty smells, or damaged ceilings or floors are indicators of water damage that should be repaired before continuing. Additionally, ensuring the area is level and has proper drainage is crucial to prevent water from pooling in the tub.
Improper leveling can lead to water accumulation, which may cause long-term damage to the surrounding structure. A level check should be performed before and after installation to confirm the tub is installed correctly.
Installing the Fiberglass Tub and Shower
Once the area is prepared and the drain system is in place, the fiberglass tub can be installed. The process involves placing the tub in position, securing it to the framing, and ensuring all connections are properly sealed.
Positioning the Tub
Carefully lower the fiberglass tub into the prepared space, ensuring it is aligned with the ledger board and drain system. A helper may be necessary to hold the tub steady while adjustments are made. The tub should be level in all directions, and shims may be required to achieve the correct height and stability.
For units that include a built-in base or feet, it is recommended to glue or use a small amount of mortar to secure the base in place. This ensures the tub remains stable and does not shift over time. Once the tub is in the desired position, a level should be used to check for evenness.
Marking and Removing for Final Adjustments
After the tub is positioned and level, use a pencil or marker to draw a line across the studs using the bottom edge of the tub as a guide. This line indicates where the tub will come into contact with the framing. Once the line is drawn on all three sides, the tub should be removed to allow for final adjustments to the framing.
The alcove should be framed to fit the tub precisely, ideally with a 1⁄4” gap to allow for expansion and proper sealing. If the gap is too large, it may be difficult to achieve a watertight seal. The tub should be installed so that its sides just touch the framing, ensuring a snug fit without excessive gaps.
Securing the Tub and Final Plumbing Connections
Once the tub is properly framed and positioned, it can be reinstalled and secured in place. The final step involves securing the trap to the drainpipe beneath the tub using pliers. This ensures the drain system is fully connected and functioning correctly.
Additional plumbing connections, such as the spout and water supply lines, should be installed at this stage. A copper pipe can be soldered with a propane torch to connect the plumbing to the spout. The spout should be screwed into the water supply until it fits snugly against the tub.
To complete the installation, a strainer plate should be installed over the drain. This helps prevent debris from entering the plumbing system and maintains proper water flow. Once all plumbing connections are in place, a thorough inspection should be conducted to ensure all components are securely fastened and watertight.
Finishing Touches and Surround Installation
After the tub is installed and the plumbing is complete, the final step involves installing the fiberglass shower surround and completing the drywall and sealing work.
Installing the Fiberglass Shower Surround
Fiberglass shower surrounds are typically installed separately from the tub, but they are designed to fit seamlessly with the overall layout. These units are lightweight and easy to install, making them an excellent option for DIY projects.
The surround should be placed in position and secured to the wall studs using screws or adhesive, depending on the manufacturer’s recommendations. Once in place, the surround should be checked for proper alignment and stability.
Drywall and Sealing
To complete the installation, moisture-resistant drywall should be installed over the remaining exposed studs. This helps protect the framing from water damage and ensures the bathroom remains durable over time.
Drywall tape and joint compound should be used to reinforce seams and create a smooth finish. Once the drywall is in place, the area should be painted with mildew-resistant paint to prevent mold and mildew growth.
Finally, silicone caulk should be applied around the edges of the tub and shower to create a watertight seal. This step is critical in preventing water from seeping into the surrounding structure and causing damage over time.
Maintenance and Long-Term Care
Fiberglass tubs and showers are known for their durability and low maintenance requirements. However, proper care can extend their lifespan and maintain their appearance.
Cleaning and Upkeep
Fiberglass surfaces should be cleaned regularly using non-abrasive cleaners and a soft cloth. Abrasive cleaners or scrubbing brushes should be avoided, as they can scratch the surface and reduce the material’s aesthetic appeal.
It is also important to inspect the tub and shower for signs of wear or damage. Cracks, chips, or discoloration should be addressed promptly to prevent further deterioration.
Longevity and Warranty
With proper installation and maintenance, a fiberglass tub can last for many years. The material is resistant to cracking, fading, and warping, making it an excellent long-term investment for any bathroom.
Some manufacturers offer warranties for their fiberglass tubs, which can provide additional peace of mind for homeowners. It is recommended to review the warranty terms and conditions to understand the coverage and any required maintenance procedures.
Conclusion
Fiberglass bathtubs and shower surrounds offer a practical and cost-effective solution for modern bathroom upgrades. With the right tools, materials, and installation techniques, these units can be installed successfully and provide long-term performance. Proper planning, careful execution, and attention to detail are essential to ensuring a watertight, durable installation.
For homeowners with intermediate DIY skills, fiberglass tubs can be a rewarding project. However, for complex or large-scale installations, it may be advisable to consult with a professional to ensure the best results. By following the steps outlined in this guide, users can achieve a functional, stylish, and long-lasting bathroom renovation.