What Do You Put Under an Acrylic Shower Base?

Acrylic shower bases have become increasingly popular due to their affordability, durability, and ease of installation. However, one common question that arises is what to put under an acrylic shower base to ensure a stable and waterproof foundation.

1. Concrete or Mortar Bed:

For a solid and long-lasting installation, a concrete or mortar bed is an excellent option. This method involves creating a level and smooth surface using a concrete mix or mortar. Once the bed is cured, the acrylic shower base can be set on top and secured with appropriate fasteners.

2. Plywood Subfloor:

A plywood subfloor is another common choice for supporting an acrylic shower base. Cut the plywood to fit the dimensions of the shower base, ensuring that it is level and secure. To prevent moisture damage, use exterior-grade plywood and seal it with a waterproofing membrane or paint.

3. Foam Insulation Boards:

Foam insulation boards provide both insulation and a stable base for the shower base. Choose rigid foam boards with a high density to ensure adequate support. Cut the boards to fit the shower area and secure them to the subfloor using construction adhesive or screws.

4. Cement Board:

Cement board is a popular choice for creating a waterproof and sturdy base for the shower base. Cut the cement board to fit the shower area, ensuring that it extends at least 2 inches beyond the edge of the base. Secure the cement board to the subfloor using screws or nails, and apply a thin layer of thin-set mortar to create a smooth surface.

5. Leveling Compound:

Self-leveling compound is a great option for creating a perfectly level surface for the shower base. Mix the compound according to the manufacturer's instructions and pour it onto the subfloor. The compound will self-level, creating a smooth and flat surface within a short period.

6. Underscore Framing:

In some cases, it may be necessary to add additional support underneath the shower base. Underscore framing involves installing horizontal supports made of wood or metal joists. These supports create a framework that helps distribute the weight of the shower base and prevents sagging or cracking.

Conclusion:

The choice of material to put under an acrylic shower base depends on factors such as the weight of the base, the condition of the subfloor, and the desired level of insulation. Whether you choose a concrete or mortar bed, plywood subfloor, foam insulation boards, cement board, leveling compound, or underscore framing, ensure that the base is properly supported, leveled, and waterproofed to ensure a long-lasting and trouble-free installation.