Understanding DuPont™ LiquidArmor™ LT Flashing & Sealant: Advanced Protection for Cold-Weather Construction
When it comes to commercial building envelopes, maintaining a reliable air and moisture barrier is critical to long-term performance. DuPont™ LiquidArmor™ LT Flashing & Sealant delivers that protection—especially in low-temperature environments where traditional flashing solutions struggle to perform.
This advanced, single-component silicone liquid flashing is designed for durability, flexibility, and ease of installation, offering contractors a powerful alternative to peel-and-stick tapes or mesh-reinforced products.
Built for Cold-Weather Applications
Unlike many sealants that require mild weather to apply properly, DuPont™ LiquidArmor™ LT performs even in extreme cold. Its formulation allows for application at temperatures as low as –20 °F (–29 °C) and up to 120 °F (49 °C), making it ideal for year-round construction schedules.
LiquidArmor™ LT is rain resistant within 15–30 minutes of installation and tolerates freeze-thaw cycles and heat aging, ensuring a strong seal in unpredictable conditions. Once cured, it forms a durable, continuous barrier that defends against air leakage and water intrusion—two of the most common causes of building envelope failure.
A Seamless Alternative to Tape Flashing
LiquidArmor™ LT replaces the need for cutting, folding, or applying mesh reinforcement. It’s a one-step liquid flashing solution that saves valuable time on the jobsite.
The product can be dispensed directly from a 20 oz sausage gun or trowel-applied from a pail, conforming easily to rough openings, penetrations, and complex geometries. Its long tooling time (about 30 minutes) allows installers to prep and finish detailed areas without rushing—improving both accuracy and appearance.
Features & Benefits at a Glance
- Wide application temperature range: –20 °F (–29 °C) to 120 °F (49 °C)
- Durable and flexible: Spans gaps up to ¼ in. (6 mm)
- Rain resistant: Within 15–30 minutes after application
- High abrasion resistance: Maintains integrity during installation
- Easy application: No mesh, primer, or tape required
- Long tooling time: Simplifies detailed flashing work
- Exposure tolerance: Up to 6 months before cladding installation
Technical Strength You Can Trust
DuPont™ LiquidArmor™ LT undergoes rigorous ASTM testing to ensure performance across multiple metrics:
| Property | Test Method | Result |
|---|---|---|
| Tensile Strength | ASTM D412 | 1450 kPa (210 psi) |
| Elongation at Break | ASTM D412 | 2.7 |
| Water Vapor Transmission | ASTM E96 | 180 ng/Pa·s·m² (3.1 perms) @ ~28 dry mils |
| Pull Adhesion to Common Substrates | ASTM D4541 | >110 kPa (>16 psi) |
| Durometer Hardness (Shore A) | ASTM C661 | 40 |
These results reflect the material’s ability to resist tearing, maintain flexibility, and adhere to common commercial substrates like foam boards, gypsum sheathing, plywood, OSB, concrete masonry units, and steel studs.
Application Made Simple
LiquidArmor™ LT is designed for trowel or sausage gun application at a wet thickness of 30 ±5 mils, curing to approximately 20 mils when dry. A wet mil gauge ensures proper application thickness and optimal performance.
For gaps greater than ¼ inch, DuPont recommends pre-filling with Great Stuff Pro™ Gaps & Cracks or Great Stuff Pro™ Window & Door before applying LiquidArmor™ LT.
Typical coverage at 30 mils (wet):
| Width | 20 oz Sausage |
| 1 inch | 105 ft |
| 2 inch | 53 ft |
| 3 inch | 35 ft |
| 4 inch | 26 ft |
Common Uses & Compatible Substrates
DuPont™ LiquidArmor™ LT integrates seamlessly into DuPont™ Commercial Wall Systems and can be used on:
- Foam insulation boards (Thermax™, STYROFOAM™)
- Fiberglass-faced gypsum sheathing
- Concrete masonry units (CMU)
- Steel studs and metal panels
- OSB and plywood
- Brick ties, veneer anchors, fasteners, and washers
Jobsite Ready
LiquidArmor™ LT is engineered for real-world construction conditions. It’s exposure-rated for up to 6 months, allowing builders flexibility in scheduling cladding installation.
For storage, unopened sausages and pails last up to 12 months, while opened units can be sealed and reused the next day—simply remove any cured material from the nozzle or surface.
Why Choose LiquidArmor™ LT
By combining cold-weather capability, installation efficiency, and long-term durability, DuPont™ LiquidArmor™ LT Flashing & Sealant stands out as a smart choice for contractors who need dependable building envelope performance without delays.
Whether you’re flashing foam board joints, sealing window openings, or protecting rough penetrations, LiquidArmor™ LT offers the confidence of DuPont™ innovation—built for the elements, and built to last.