Composeal Blue PVC Shower Pan Liner 40 Mil 4 Ft Wide - Cut to Order

Composeal Blue PVC Shower Pan Liner 40 Mil 4 Ft Wide - Cut to Order

Professional-grade 40 mil PVC shower pan liner designed for waterproofing showers, wet areas, Roman tubs, roof decks, and mortar bed tile installations.

Composeal Blue Vinyl Shower Pan Liner - 4 Ft Wide

Sold in 4 sq. ft. increments (roll is 4 ft. wide). Please add the total square footage needed to your cart.

Sold by linear foot and priced by square foot. Each linear foot provides approximately 4 square feet of coverage.

Select the total square footage needed and the order will be cut from a master roll to the nearest linear run required.

For thick bed shower, roof deck, and wet area installations.

The Composeal Blue Shower Pan Liner is a flexible 40 mil PVC waterproofing membrane engineered to provide reliable moisture protection beneath ceramic tile, porcelain tile, marble, and natural stone installations. Designed for use beneath thick-set mortar beds, it creates a durable waterproof barrier for residential and commercial waterproofing projects.

Specifications

• Material: Flexible PVC
• Thickness: 40 Mil
• Roll Width: 4 Ft.
• Available Manufacturer Widths: 48 in., 60 in., and 72 in.
• Application: Shower pans, Roman tubs, whirlpool bath enclosures, fountains, roof decks, and wet areas
• Installation Method: Beneath 1-1/4 in. to 2 in. thick mortar beds
• Made in the U.S.A.

Benefits

Unlike prefabricated shower bases or metal waterproofing pans, Composeal can be formed to fit virtually any shower size, shape, curb configuration, or drain location. The membrane is easy to cut and install on site, making it an excellent choice for custom shower construction, remodeling projects, and renovation work.

Seams are solvent welded using Composeal Solvent Cement, providing immediate contact strength and reliable waterproof performance. Pre-formed corner and curb protectors are also available to reinforce critical waterproofing areas.

Key Features and Benefits

• 40 mil thick flexible PVC waterproofing membrane
• Professional-grade shower pan liner for custom installations
• Suitable for showers, Roman tubs, and whirlpool bath enclosures
• Can be formed to fit custom dimensions and drain locations
• Easy to cut and install on site
• Compatible with solvent-welded seams
• Long-lasting waterproof protection beneath tile and stone
• Suitable for renovation, remodeling, and new construction projects
• Can be used for roof deck waterproofing applications
• Widely used in northern climates as outdoor hockey rink liners

Ideal Applications

• Custom shower pan construction
• Tile shower waterproofing systems
• Roman tubs
• Whirlpool bath enclosures
• Bathroom remodeling projects
• Commercial shower installations
• Fountains and water features
• Roof deck waterproofing
• Wet rooms and moisture-prone environments
• Outdoor hockey rink liners

Installation Information

Before installation, ensure the subfloor is properly sloped toward the drain at 1/4 inch per foot and free from debris, gravel, or protrusions. Extend the membrane at least 3 inches above the finished curb height and fasten only above the curb line.

Wood studs should be notched to accommodate the membrane thickness, while metal stud installations should use furring strips to maintain a flat wall surface. Use clamping-ring drains with weep holes and perform a 24-hour water test before covering the membrane with mortar.

Testing and Code Compliance

Composeal 30 and 40 mil membranes have been independently tested and meet Ceramic Tile Institute waterproofing membrane requirements. The membranes comply with UPC-IAPMO, SBCCI, and BOCA plumbing codes and have received municipal approvals where required, including approvals referenced by the manufacturer for the City of Los Angeles, City of Philadelphia, Metropolitan Dade County, and the Commonwealth of Massachusetts.

Composeal also complies with Corps of Engineers specifications for PVC shower pan materials and meets FHA Publication 4900.1 requirements.

Warranty Information

Composeal 30 and 40 mil membranes are warranted against material failure. Warranty coverage applies to the membrane material itself and does not extend to installation methods, consequential damages, or conditions beyond the manufacturer's control. Under normal conditions, Composeal membranes are designed to last for the life of the building.

Made in the U.S.A.

Helpful Resources

• Composeal Gold Installation Guide
• Composeal Gold and Radiant Heat Flooring Systems
• Composeal Waterproofing Videos
• Solution for Types of Concrete Cracks

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