Waterproofing is the layer between your structure and the moisture that can silently damage it. But not every membrane serves the same job: a roof needs a flexible rubber blanket, a shower needs a vapor-barrier underlayment, and a window needs a narrow flashing tape. This guide compares four rolls ranging from a $34.44 flashing membrane to a $139.99 EPDM roof sheet, so you can pick the one that suits your specific surface.
At a glance, you are choosing between a narrow flashing tape, a wet-area tile underlayment, a fabric tile membrane, and a large rubber roof sheet. Here is how the listed prices line up:
| Product | Listed Price | Price Bar |
|---|---|---|
| REDGARD Fabric Membrane (Red) | USD 87.99 | |
| Shower 20 Mil PE Membrane | USD 63.50 | |
| Henry FortiFlash Flashing Membrane 6"x75FT | USD 34.44 | |
| Uimoso 10 x 15 ft EPDM Rubber Roll | USD 139.99 |
Decision matrix
Match the membrane to the project type:
- For roof decking, flat roofs, RVs, or pond liners: Uimoso 10 x 15 ft EPDM Rubber Roll.
- For shower walls, bathroom floors, steam rooms, and wet areas: Shower 20 Mil PE Membrane.
- For tile-friendly waterproofing over a full area: REDGARD Fabric Membrane.
- For sealing around windows, doors, vents, hose bibs, and protrusions: Henry FortiFlash Flashing Membrane.
Product notes
#### REDGARD Fabric Membrane 108 sq Ft (1 Roll) Red Waterproof-Suitable for all tile
This red fabric membrane covers a generous 108 square feet per roll and is listed at USD 87.99. The title says it is suitable for all tile, so it can serve as a waterproofing layer beneath tile installations. It comes as a new factory-wrapped roll, and the listed model is simply "Fabric Membrane." If you need a broad surface roll that pairs with tile work, this gives you the same coverage area as the shower membrane but in a fabric format. The primary tradeoff is price: at $87.99, it costs more than the 108-sq-ft PE shower membrane in this lineup, so shoppers who just need a basic tile underlayment may find a lower-priced option among the four.
#### Shower 20 Mil Shower Waterproofing Membrane 3.3 Ft X 33 Ft Roll (108 Sq.Ft) - PE
This PE membrane is priced at USD 63.50 and covers 108 sq ft. The description says it is a 20 mil, three-layer polyethylene core with dual non-woven fabric layers, making it a reliable underlayment for shower walls, bathroom floors, steam rooms, and wet areas. The listed color is orange, and the included component is the membrane itself. That feature set makes it a natural choice for tile projects where a vapor barrier is part of the plan. The limitation is coverage math: this roll is 3.3 ft wide by 33 ft long, so a long bathroom run may require more than one roll to complete the job.
#### Henry FortiFlash Waterproof Flashing Membrane 6"x75FT 25mil
The Henry FortiFlash is the lowest-priced roll in this comparison at USD 34.44. This 6-inch by 75-foot roll is described as a self-adhesive waterproof flashing membrane, and the description also mentions it is suited for windows and through-wall penetrations like hose bibs, vents, electrical boxes, and exterior lights. Its 25 mil reinforced polyethylene film lets it wrap around protrusions without tearing. The limitation is purpose: this is a flashing tape, not a broad surface membrane. You would not use it to cover a roof or a shower floor; it is designed for sealing edges, joints, and penetrations.
#### Uimoso 10 x 15 ft EPDM Rubber Roll for Roofing, RVs, and Ponds
The Uimoso roll is the largest and most expensive in this lineup at USD 139.99. It comes as a 10 x 15 ft EPDM synthetic rubber sheet with a 45 mil thickness, according to the listed attributes. The description says it handles extreme temperatures and conforms to roof contours, which fits roofing, RV, and pond applications. For a large exposed area that needs durable rubber waterproofing, this sheet provides a larger footprint than the other rolls in this comparison. The limitation is commitment: at $139.99, it is the highest listed price here, and a 10 x 15 ft footprint covers a sizable area, so it only makes sense if your project can use that much material.
Final recommendation by use case
- For a roof, RV, or pond surface: Uimoso 10 x 15 ft EPDM Rubber Roll.
- For a shower, steam room, or bathroom floor beneath tile: Shower 20 Mil PE Membrane.
- For a tile-friendly fabric membrane: REDGARD Fabric Membrane.
- For window, door, and through-wall sealing: Henry FortiFlash Waterproof Flashing Membrane.
