Freestanding Bathtubs

How Freestanding Acrylic Tubs Are Built

Acrylic accounts for roughly 85% of freestanding bathtubs sold today due to its durability, light weight, and heat retention. High-quality acrylic tubs rely on a dual-shell construction process designed to hold up to daily use without flexing or cracking:

• Dual Vacuum-Formed Shells: Pure acrylic sheets are individually heat-formed into separate inner and outer shells.

• Flex-Resistant Floor Core: A 3/4" thick structural support board is fiberglassed and resin-bonded to the basin floor to eliminate flexing when stepping in and out.

• Fiberglass Reinforcement: Multiple applications of structural fiberglass and resin coat the interior surfaces of both shells to maximize rigidity.

• Seamless Shell Fusion: Inner and outer shells are precision-bonded at the top lip using heavy-duty resin and fiberglass reinforcement. An acrylic finish coat conceals the joint line for a smooth finish.

Internal Support & Load Bearing

To prevent stress on the decorative outer shell, structural support is built beneath the tub:

• Integrated Stainless Steel Frame: A structural steel frame is resin-bonded directly to the underside of the inner basin.

• Six Adjustable Leveling Feet: Heavy-duty leveling legs adjust to accommodate uneven floors while transferring the entire load—water and occupant—directly to the floor.

Plumbing & Subfloor Drain Flexibility

• Built-in 4" to 5" Sub-Tub Gap: A hollow cavity between the inner basin and floor allows drain lines to be redirected laterally without cutting new holes into the subfloor.

• 30-Inch Code Allowance: Plumbing codes permit up to a 30-inch hard-piped diversion from the tub drain center to the center of the P-trap.

• Hard-Piped Mandatory Installation: Redirected plumbing must be rigid PVC/ABS pipe. Flexible corrugated piping violates building codes because the ridges trap water, creating severe mold and bacteria hazards over time.

SanSiro Freestanding Bathtubs

Unmatched Thermal Efficiency & Master Craftsmanship

Discover the SanSiro and CoreAcryl bathtub collections, engineered for exceptional heat retention, deep-soak comfort, and enduring structural rigidity. Whether your bathroom design calls for clean modern silhouettes or timeless vintage and classic styling, each bathtub is master-built to serve as an elegant, lasting centerpiece. Every shell utilizes high-grade, scratch- and bacteria-resistant acrylic that withstands daily use while maintaining a smooth, non-porous finish.

Advanced CoreAcryl & Insulation Technology

To eliminate cold bathwater and provide a solid, premium feel underfoot, SanSiro bathtubs incorporate industry-leading thermal barriers:

• Dense Foam Double-Wall Insulation: High-density foam insulation is applied directly between the inner and outer cavity walls of our reinforced acrylic models. This double-wall barrier locks in heat, allowing for extended, peaceful soaks without constant hot water refills.

• CoreAcryl Double-Skinned Shells: CoreAcryl models feature a 3/4-inch thick double-skinned acrylic wall bonded with heavy-duty resin and fiberglass, layered alongside an integrated aluminum foil thermal barrier for maximum strength and heat retention.

Custom Artisan Finishes

Personalize your bath with bespoke exterior options, including our exclusive Matte Stone-Look finish. Get the prestigious, honed aesthetic of natural solid stone combined with the lighter weight and easier handling of acrylic for straightforward installation.