Liquid Flashing vs. Traditional Roll Flashing: Benefits & Drawbacks
Flashing is a critical part of protecting windows, doors, penetrations, and other vulnerable areas from water intrusion. Traditionally, contractors have relied on self-adhered roll flashing tapes, but liquid-applied flashing has become another popular option.
Both products are designed to create a water-resistant barrier, but they have different advantages depending on the application. Browse through our offering of flashing products!
What Is Liquid Flashing?
Liquid flashing is a fluid-applied waterproofing material that is brushed, rolled, or spread onto a surface. Once cured, it forms a continuous membrane that adheres directly to the substrate.
Unlike roll flashing, liquid flashing can conform to irregular shapes, corners, penetrations, and other difficult areas without requiring the installer to cut and fold multiple pieces of material.
Benefits of Liquid Flashing
Handles Complex Areas
One of the biggest advantages of liquid flashing is its ability to conform to complicated shapes. It can be particularly useful around window and door openings, corners, penetrations, joints, and recessed openings where traditional flashing tape can be more difficult to install.
Creates a Continuous Membrane
Roll flashing requires seams and overlaps, while liquid flashing creates a continuous coating across the prepared surface. This can reduce potential problem areas caused by improperly overlapped or poorly adhered sections.
No Wrinkles or Fishmouths
Flashing tape can sometimes develop wrinkles, bubbles, or fishmouths when installed around corners and irregular surfaces. Liquid flashing eliminates many of these issues because it is applied directly to the substrate.
Can Seal Small Gaps and Imperfections
Liquid flashing can work into small gaps and surface irregularities that may be difficult to cover with a sheet product, helping create a more continuous seal.
Drawbacks of Liquid Flashing
Liquid flashing isn’t necessarily the best choice for every application.
Application thickness matters. Unlike factory-made flashing tape, liquid flashing must be applied to the manufacturer’s specified thickness. Applying too little material can affect performance.
Surface preparation is important. The substrate generally needs to be clean, sound, and suitable for the product. Some applications may also require primer.
Weather and temperature can matter. Liquid flashing products often have specific installation temperature and moisture requirements, and curing times can vary depending on conditions.
It can be messier. Roll flashing is generally a simple cut-and-apply process, while liquid flashing requires spreading or rolling the material and cleaning application tools.
Where Traditional Roll Flashing Has an Advantage
Traditional flashing tape remains an excellent option for many applications. It is especially efficient on simple, straight surfaces where the installer can quickly measure, cut, and apply the material.
Other advantages include:
- Factory-controlled thickness
- Quick and familiar installation
- No field application of a wet coating
- Easy storage and handling
- Excellent for straight runs and simple openings
Liquid Flashing vs. Roll Flashing
| Feature | Liquid Flashing | Roll Flashing |
|---|---|---|
| Complex shapes | Excellent | More difficult |
| Corners & penetrations | Excellent | Requires cutting/folding |
| Straight runs | Good | Excellent |
| Seams | Continuous membrane | Requires overlaps |
| Thickness consistency | Depends on application | Factory controlled |
| Cure time | Typically required | Minimal |
| Application | Brush, roller, or spread | Cut and adhere |
| Simple openings | Good | Excellent |
The Bottom Line
Liquid flashing and traditional roll flashing are both valuable tools for protecting a building from water intrusion. Liquid flashing offers a major advantage when dealing with complex shapes, corners, penetrations, and irregular surfaces, while traditional roll flashing remains an efficient choice for straightforward applications and straight runs.
Rather than viewing liquid flashing as a replacement for roll flashing, contractors can consider the two products complementary. The best choice depends on the specific application, substrate, installation conditions, and manufacturer’s requirements.
