Composeal Grey 40 Mil PVC Specifications & Technical Data
Composeal Grey 40 Mil PVC Waterproofing Membrane is a flexible waterproofing membrane designed for use beneath tile and stone installations where long-term moisture protection is required. Manufactured by Compotite, Composeal has been used in waterproofing applications for decades and remains one of the industry's most recognized PVC shower pan and waterproofing membranes.
Designed for both residential and commercial applications, Composeal Grey 40 Mil PVC provides reliable waterproofing protection for custom tiled showers, baths, fountains, roof decks, terraces, exterior stairs, walkways, and other areas exposed to moisture. Its flexible construction allows it to conform to custom dimensions and drain locations while maintaining durable waterproof performance.
This technical data guide provides product specifications, engineering properties, ASTM testing results, code approvals, and performance data for Composeal Grey 40 Mil PVC waterproofing membrane.
Manufacturer: Compotite
Product: Composeal Grey 40 Mil PVC
Primary Use: Waterproofing under thick-bed tile and stone installations
Made In: USA
Key Features & Benefits
Composeal Grey 40 Mil PVC is engineered to provide dependable waterproofing performance beneath tile and stone installations while remaining flexible and easy to work with during installation. Its durable PVC construction helps protect structures from costly secondary water damage caused by moisture intrusion.
- Flexible waterproofing membrane for floors and walls
- Designed for custom tiled showers and bath installations
- Suitable for fountains, roof decks, terraces, exterior stairs, and walkways
- Easily formed to accommodate custom dimensions and drain locations
- Durable and long-lasting waterproofing protection
- Ideal for both new construction and renovation projects
- Economically priced for residential and commercial applications
- Manufactured with 50% recycled content
- 40 mil membrane thickness
- Available in 5-foot and 6-foot roll widths
- Available in 50-foot and 100-foot roll lengths
- Meets and exceeds ASTM D4551 requirements for flexible PVC waterproofing membranes
- Made in the U.S.A.
Common Applications
- Custom tiled shower pans
- Wet rooms and bathroom waterproofing systems
- Roman tubs and whirlpool bath enclosures
- Fountains and decorative water features
- Roof decks and terraces
- Exterior stairs and walkways
- Commercial and residential waterproofing projects
- Thick-bed tile and stone installations
Engineering Properties & ASTM Test Results
The following engineering data compares ASTM D4551 performance requirements with actual Composeal Grey 40 Mil PVC test results.
| Property | ASTM D4551 Requirement | Composeal Test Result |
| Thickness | .040" | .042" |
| Tensile Strength | 80 lb minimum | 113 lb (2700 PSI) |
| Tensile Strength at 100% Elongation | 40 lb minimum | 57 lb |
| Ultimate Elongation Before Breaking | 300% minimum | 400%+ |
| Tear Resistance | 250 lb minimum | 263 lb |
| Pinholes | None | None |
| Micro-Organism Resistance | No Growth | No Growth |
| Distilled Water Weight Change | 1% maximum | +0.4% |
| Distilled Water Weight Change | 2% maximum | +0.3% |
| Alkali Resistance | Pass | Pass |
| Shrinkage at 158°F | 5% maximum | 2.9% |
| Volatility After Aging | 1.5 maximum | None |
| Hydrostatic Pressure Test | Pass | Pass |
| After Folding Test (0°F) | Pass | Pass |
| After Puncture Test | Pass | Pass |
| After Identification Test | Pass | Pass |
During hydrostatic pressure testing, no evidence of surface wetness or other signs of water penetration were detected on any tested specimens.
These results demonstrate that Composeal Grey 40 Mil PVC meets or exceeds the performance requirements established by ASTM D4551 for flexible PVC waterproofing membranes used in shower pan and waterproofing applications.
Engineering Properties & ASTM Test Results
The following engineering data compares ASTM D4551 performance requirements with actual Composeal Grey 40 Mil PVC test results.
| Property | ASTM D4551 Requirement | Composeal Test Result |
| Thickness | .040" | .042" |
| Tensile Strength | 80 lb minimum | 113 lb (2700 PSI) |
| Tensile Strength at 100% Elongation | 40 lb minimum | 57 lb |
| Ultimate Elongation Before Breaking | 300% minimum | 400%+ |
| Tear Resistance | 250 lb minimum | 263 lb |
| Pinholes | None | None |
| Micro-Organism Resistance | No Growth | No Growth |
| Distilled Water Weight Change | 1% maximum | +0.4% |
| Distilled Water Weight Change | 2% maximum | +0.3% |
| Alkali Resistance | Pass | Pass |
| Shrinkage at 158°F | 5% maximum | 2.9% |
| Volatility After Aging | 1.5 maximum | None |
| Hydrostatic Pressure Test | Pass | Pass |
| After Folding Test (0°F) | Pass | Pass |
| After Puncture Test | Pass | Pass |
| After Identification Test | Pass | Pass |
During hydrostatic pressure testing, no evidence of surface wetness or other signs of water penetration were detected on any tested specimens.
These results demonstrate that Composeal Grey 40 Mil PVC meets or exceeds the performance requirements established by ASTM D4551 for flexible PVC waterproofing membranes used in shower pan and waterproofing applications.
Additional Testing & Performance Data
In addition to meeting ASTM D4551 requirements for flexible PVC waterproofing membranes, Composeal Grey 40 Mil PVC has undergone additional testing to verify long-term durability, seam performance, and resistance to demanding environmental conditions.
| Test Property | Result |
| ASTM D751 Seam (Lap Joint) Strength | 85 lbs/inch |
| Specific Gravity | 1.29 g/cm³ |
| Cold Crack Resistance | Passed at -53°F |
Composeal Grey 40 Mil PVC also complies with additional industry-recognized testing standards, including ASTM D1004, ASTM D2240, ASTM D412, ASTM D1790, ASTM E96, and FHA Specification 4900.1.
The membrane demonstrated excellent resistance to moisture penetration during hydrostatic pressure testing, with no evidence of surface wetness or water penetration observed on tested specimens.
Independent testing was performed by SGS U.S. Testing Company of Tulsa, Oklahoma, and Smith Emery Laboratories.
Chemical & Environmental Resistance
- Resistant to fungus, mildew, and mold growth
- Passed alkali resistance testing
- Minimal dimensional change during heat aging
- Maintains flexibility under extreme cold conditions
- Designed for long-term waterproofing performance beneath tile and stone installations
*Water absorption values represent measured changes resulting from exposure during testing procedures.
Specifications & Code Compliance
Composeal Grey 40 Mil PVC complies with recognized industry standards and building code requirements for waterproofing membranes used beneath tile and stone installations. The membrane has been tested and evaluated for performance, durability, and waterproof integrity in accordance with applicable standards.
- ICC-ES Approval for the United States and Canada (Report PMG-1459)
- NES Approval (PCR SP 102)
- City of Los Angeles Approval (RR#4398)
- City of Philadelphia Approval (40 Mil)
- Metropolitan Dade County, Florida Approval
- Commonwealth of Massachusetts Approval
- Corps of Engineers Specification Compliance for PVC Shower Pan Materials
- FHA Publication 4900.1 Compliance
- Meets and exceeds ASTM D4551 requirements for PVC waterproofing membranes
ASTM D4551 is the industry-recognized testing standard established for PVC membranes used in shower pan and waterproofing applications. Composeal Grey 40 Mil PVC meets and surpasses the engineering requirements established by this standard.
Product Limitations
Composeal Grey 40 Mil PVC should not be used as a liner for pools containing fish or water plants.
Technical Support
The Tile Council of North America (TCNA) Handbook for Ceramic, Glass and Stone Tile Installation provides general installation guidelines for projects requiring waterproof membranes. Installers should follow applicable TCNA recommendations, local building codes, and manufacturer installation procedures.
Compotite Corporation provides technical support for Composeal waterproofing products. Additional technical literature, installation materials, and product information are available through Compotite and authorized distributors.
Manufacturer Information
Compotite Corporation
730 Mooney Street
Bartow, Florida 33830
Phone: 1-800-221-1056
For additional technical information, specifications, and installation guidance, contact Compotite directly or consult the latest manufacturer documentation.
Helpful Resources
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- Composeal Grey 40 Mil PVC Installation Instructions
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- Composeal Waterproofing Videos
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