One-Piece XPS Shower Pan With Waterproof Membrane Encapsulation
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Solution Overview
Problem
Existing shower pans face challenges in being easy to install while maintaining water resistance and leak-proof integrity.
Innovation Solution
A one-piece shower pan is fabricated using extruded polystyrene foam, shaped with a CNC router, and encapsulated with a waterproof polyurethane or polyurea membrane, combined with splash walls from concrete wall board for a rigid and waterproof assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple separate components are used to construct the shower pan, then ease of installation is improved, but water resistance and leak-proof integrity deteriorate
Solution Approach 1:
The patent combines multiple shower pan components (pan base, curb, splash walls, and membrane) into a single pre-assembled unit that is installed as one piece. This merging eliminates the need for on-site assembly of multiple separate parts while maintaining water resistance through factory-applied waterproofing membranes and pre-formed integration points.
Solution Approach 2:
The shower pan components are pre-assembled and pre-waterproofed in the factory before shipment. The waterproofing membrane is applied and sealed to all components beforehand, ensuring leak-proof integrity is established before installation. This preliminary action prevents water infiltration issues that would arise from field assembly.
2Reliability
If a one-piece unit is used for the shower pan, then water resistance is improved, but device complexity increases
Solution Approach 1:
The fabrication process is segmented into distinct manufacturing steps (cutting foam core, shaping curb, installing membrane, applying coating) that can be performed independently in a factory setting. This segmentation allows complex fabrication to be broken down into manageable, repeatable processes while achieving a one-piece final product.
Solution Approach 2:
The shower pan uses composite construction combining XPS foam core material for structure, waterproof membrane for sealing, and polyurethane/polyurea coating for protection. This multi-material composite approach enables the one-piece design to achieve both structural integrity and water resistance through material properties rather than complex mechanical assemblies.
3Ease of manufacture
If extruded polystyrene foam is used as the core material, then ease of manufacture is improved, but strength and rigidity deteriorate
Solution Approach 1:
A waterproof membrane is applied over the XPS foam core to provide structural reinforcement and surface protection. This thin film layer compensates for the softness of the foam material while maintaining the ease of foam shaping benefits. The membrane acts as a reinforcing shell that enables the foam to function structurally.
Solution Approach 2:
The XPS foam core is combined with waterproof membrane and protective coating layers to create a composite structure. The foam provides ease of fabrication and insulation, while the membrane and coating layers contribute strength, rigidity, and water resistance. This composite material system resolves the contradiction between ease of manufacture and structural strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a one-piece, rigid, and waterproof shower pan that is easy to install and resistant to water leaks, addressing the installation and water resistance issues in existing technologies.
Implementation Method 1
spraying the entire pan assembly with a polyurethane or polyurea coating to completely encapsulate the entire pan with a waterproof membrane, which provides strength and rigidity
Implementation Method 2
gluing the foam to a pan base on the open sides. Splash walls are then cut from concrete wall board and glued to the sides having no curb, so that the glue serves as a bonding agent
Data Source
AI summary
A one piece shower drain pan, encapsulated in a water proof membrane, and the method of fabricating the one piece open drain shower pan, the method which includes providing extruded polystyrene (XPS) foam of the type which absorbs very little water; shaping the section of extruded polystyrene foam with a CNC router to obtain the desired slope in the floor; cutting a hole in the foam to produce the drain hole; cutting a curb from the XPS foam and gluing the foam to a pan base on the open sides. Splash walls are then cut from concrete wall board and glued to the sides having no curb, so that the glue serves as a bonding agent and provides a waterproof seal between the parts; after the glue has cured, spraying the entire pan assembly with a polyurethane or polyurea coating to completely encapsulate the entire pan with a waterproof membrane, which provides strength and rigidity and defines a one piece drain pan ready for installation.