High Performance
WRB/Air Barriers and
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Product Offering

VaproLiqui-Flash is a liquid applied Waterproof Flashing material for window and door interfaces. It is designed for use with VaproShield Sheet Membranes in Air Barrier and Weather Resistive Barrier applications.

VaproLiqui-Flash is a unique material formulated to bond without primers to VaproShield membranes and most common wall substrates forming a monolithic, waterproof surface while remaining permeable to water vapor. It allows underlying moisture to escape to the exterior, reducing the potential for mold and decay that is often associated with non-permeable flashings.


  • Allows same day installation of windows and doors
  • Bonds directly to damp or dry surfaces and cures under a variety of weather conditions
  • Skins-over in 30 minutes and dries in 4 hours at 70°F (21°C) and 50% relative humidity
  • Suitable for all climates and weather conditions
  • Produces an opaque membrane when installed at the recommended 12 15 wet mils simplifying inspection and quality control
  • May be exposed to weather for up to 6 months without compromising performance
  • Single component formulation
  • No shrinkage. No staining. No yellowing.
  • Breathable – allows damp surface to dry
  • Will not support mold growth
  • Non-corrosive and adds self-sealing properties to fastener penetrations

VLF Image 2


  • Solvent free. Isocyanate free. Complies with all VOC regulations. STPE provides superior long term adhesion, crack bridging and weathering characteristics. Meets IITS-0230C and ASTM-C-920.


  • Appropriate for vertical or horizontal above-grade applications to concrete, masonry, natural stone, structural sheathing, architectural metal panels, painted metals, glass, PVC, FRP, EPDM, all VaproShield Weather Resistive Barrier and Air Barrier membranes, and most other building materials.


  • Adheres to most common building materials without priming to produce a durable, weather-tight seal, which is not subject to tearing or displacement when subjected to wind loads during construction.


  • Surface and ambient temperatures must be above 35° and below 100°F (2° to 38°C) for application.
  • Cured service temperatures: -50° to 350°F (-45° to 175°C)
  • Gun-able 20 oz. (567 g) sausages
  • Easily spreads and trowels into place
  • See VaproLiqui-Flash Installation Instructions for Best Practice Installation Sequence

VOC Compliance

  • VaproLiqui-Flash is compliant with the following national, state and district VOC regulations:
  • US Environmental Protection Agency
  • California Air Resources Board SCM Districts
  • South Coast Air Quality Management District
  • Maricopa County, AZ
  • Northeast Ozone Transport Commission 


LiquiFlash Window
WrapFlashing SA Self-Adhered combined with VaproLiqui-Flash allows same day installation of windows and doors.

LiquiFlash Coverage


VaproLiqui-Flash is a liquid applied Waterproof Flashing material for window and door interfaces. It is designed for use with VaproShield Sheet Membranes in Air Barrier and Weather Resistive Barrier applications.

The chart below helps to calculate how much VaproLiqui-Flash you will need when using either WrapFlashing SA Self-Adhered, WrapFlashing, RevealFlashing.


hagen 181214 0108R cutout
hagen 181214 0108R cutout
0.51  0.77 
0.70  0.97 
0.58  0.88 
0.80  1.11 
0.80  1.11 
0.72  1.11 
1.00  1.38 
0.87  1.33 
1.20  1.66 
0.29  0.44 
0.40  0.55 


(Based on smooth surface)
Packaging Unit Coverage Area Recommended Thickness

VaproLiqui-Flash 20 oz (.59 L) Sausage

hagen 181214 0108R cutout

10-12 ft2
(0.9-1.1 m2)

12-15 mil
(0.30 - 0.38 mm)

VaproLiqui-Flash 1 Gallon (3.7 L) Pail

hagen 181214 0225R cutout

65-70 ft2
(6-6.5 m2)
12-15 mil
(0.30 - 0.38 mm)


Related Products

WrapFlashing is simply the field membrane pre-cut into rolls of different sizes helping to save labor and reduce waste. WrapFlashing is used to cover membrane laps, flash around windows, rough openings and penetrations.

 vaproflashing WrapFlashing Roll Sizes:
11 ¾ or 19 2/3” x 164’ More information
vaproflashingSA WrapFlashing SA Self-Adhered Roll Sizes:
11 ¾ or 19 2/3” x 164’ More information
revealflashing RevealFlashing Roll Sizes:
6 ½” or 11 ¾” x 164’ More information
revealflashingSA RevealFlashing SA Self-Adhered Roll Size:
11 ¾” x 102’ More information

Approvals and Testing

Density 1378 - 1402 g/l (11.5 - 11.7 lbs/gal)
Composition Silyl Terminated Polyether (STPE)
Silyl, ethenyltrimethoxy
Phthalet Composition Dipropylheptyl phthalate (DPHP)
Minimum Application Temperature 35° (2°C)
Service Temperature  minus 40°F (-40°C) - 183°F (84°C)
UV Exposure 6 months
Specific Gravity 1.3 - 1.6
Sausage Weight

20 fluid ounces (0.59 L)
[approximate weight 0.8 kg (1.8 lb)]

Gallon Weight

3.79 L (128 fl oz) weight will vary
(net 11.5 lbs/pail, gross 12.2 lbs/pail)

VOC Content <30 g/L
Storage and Handling Store in cool (<80°F [<27°C]) dry area
Application Apply at minimum 12-15 wet mil (0.30 - 0.38 mm)
Curing and Drying

At 70°F (21°C)/50% RH, skins in 50 minutes; dries in 4 hours.
Low temperatures/ relative humidity slow dry time;
high temperatures/relative humidity accelerate dry time.

Warranty 20 year material






Durometer Hardness, Shore A

ASTM C661 Standard Test Method for Evaluating Degree of Cracking of Exterior Paints

20 - 30 points

Tensile Strength

ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension

0.69 - 1.03 MPa (100-150 psi)

Elongation at Break

ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension

150 - 200%

Water Vapor Transmission
Water Method

ASTM E96 B 24.4°C (76.0°F) 50 %RH Standard Test Methods for Water Vapor Transmission of Materials (wet method)

9 Perm (grains/hr•ft2•inchHg) at 0.30 mm (12 mil) g/ 24 hr•m2 at 0.30 mm (12 mil)

515 ng/Pa•s•m2

Water Vapor Transmission
Dynamic Relative Humidity Measurement

ASTM E398 (23°C 50 %RH) Standard Test Method for Water Vapor Transmission Rate of Sheet Materials Using Dynamic Relative Humidity Measurement

8 Perm (grain/h•ft2•inchHg) at 0.30 mm (12 mil)

458 ng/Pa•s•m2

Peel Strength

ASTM C794 Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants

3.5 - 5.3 N/mm (20-30 pli)

Flame Spread Smoke Developed

ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials

Flame Spread = 0 Smoke Developed = 15