Product Data Sheet
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PAREX® WeatherSeal Trowel-On WG

Trowel Applied Air/Water-Resistive Barrier With Gauging Aggregate

PAREX® WeatherSeal Trowel-On WG is a 100% Acrylic based water-resistive barrier that is designed for use as air/water-resistive barrier behind exterior claddings. PAREX® WeatherSeal Trowel-On WG is highly flexible: can bridge existing hairline cracks and accommodate small movements.

  • One continuous air/water-resistive barrier for buildings with multiple claddings (can be used with most code-compliant claddings).
  • Can be applied with a Trowel
  • One component, easy to apply formulation that meets low VOC requirements in all 50 states.
  • Water Clean Up 
  • Rugged membrane resists damage after installation.
  • Allows for flexible construction scheduling with a 6 month outdoor exposure rating (surface must be clean of dirt and contaminants before the application of EIFS adhesive)
Product Data Sheet
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Usage

Water-resistive barrier with gauging that can be applied with a trowel Water-resistive barrier coating for application to:
  • glass mat gypsum sheathing
  • exterior grade gypsum sheathing
  • exposure 1 or exterior plywood
  • exposure 1 OSB
  • poured in place/ precast concrete
  • concrete masonry/ brick
  • cement board sheathing (Consult “Acceptable Substrate and Area of Use” Technical bulletin for more details.)
     

Advantages

  • One continuous air/water-resistive barrier for buildings with multiple claddings (can be used with most code-compliant claddings).
  • Can be applied with a Trowel
  • One component, easy to apply formulation that meets low VOC requirements in all 50 states.
  • Water Clean Up 
  • Rugged membrane resists damage after installation.
  • Allows for flexible construction scheduling with a 6 month outdoor exposure rating (surface must be clean of dirt and contaminants before the application of EIFS adhesive)

Packaging

55 lb (25.0 kg) net weight pails

Product Details

Product Information

Shelf Life

Two (2) years, properly stored in original containers.

Storage Conditions

  • Storage: Protect from sun and freezing at all times
  • Do not stack pails more than 3 pails high

Volatile organic compound (VOC) content

1 gram per liter
Technical Information

Flexural Strength

TEST

METHOD

ICC and ASTM E2570 Criteria

RESULTS

FlexibilityASTM D522No CriteriaNo Cracking at 1/8” (3mm)

Tensile Strength

Tensile Bond Strength

ASTM E 2134/
ASTM C 297

Minimum 15 psi (104 kPa)

Pass all listed substrates and flashing materials

Resistance to Weathering

Accelerated WeatheringAC 212

25 Cycles followed by Hydrostatic Pressure Test: No water penetration on the plane of the exterior facing side of the substrate.

Pass: No water penetration
Freeze-Thaw ResistanceASTM E 248510 CyclesPass: No Deleterious Effects
Hydrostatic Pressure TestAATCC 127 (Water Column)Resist 21.6 in (55 cm) water for 5 hours before and after agingPass: No water penetration
Water ResistanceASTM D 224714 DaysPass: No Deleterious Effects.
Water PenetrationASTM E3312.86 psf (137 Pa) for 15 minutesPass: 25.4 psf (1216 Pa) for 165 minutes
Water PenetrationASTM E331Tested after Structural Loading, Racking and Restrained Environmental Cycling at 2.86 psf (137 Pa) for 15 minutesPass: No Water Penetration
Water vapor transmissionASTM E96 Procedure BVapor Permeable8.8 perms
WeatheringICC ES AC 212/ ASTM E2570210 hours of UV Exposure, 25 cycles of accelerated weathering, 21.6 in (549mm) water column for 5 hoursPass

Microbiological Resistance

Mildew ResistanceASTM D3273No Criteria35 Days

Durability

Nail Seal ability, Head of WaterASTM D1970No CriteriaPass: 5 inches of water
RackingASTM E72Deflection at ⅛ in (3.2mm)Pass: No cracking at field, joints or flashing connection
Restrained EnvironmentalICC ES AC 212
/ ASTM E2570		5 Cycles of wetting and dryingPass: No cracking at field, joints or flashing connection
Structural Loading

ASTM E1233

Procedure A

10 Cycles @ 80% design loadPass: No cracking at field, joints or flashing connection

Air permeance

Air InfiltrationASTM E2178Calculated flow Rate at 75 Pa (1.57
lb/ft2, 0.3 in H2O) =
< 0.02 L/m2*s (< 0.004 cfm/ft2)		< .00001 L/m2*s (0.00001
cfm/ft2) at 75 Pa (1.57 lb/ft2,
0.3 in H2O)
Air Leakage of Air Barrier AssembliesASTM E2357Pass < 0.2 L / s.m2 at 75 Pa)
(< 0.04 cfm / ft2 at 1.57 psf)		Pass

Application

Application Information

Drying Time

The drying time of PAREX® WeatherSeal Trowel-On WG depends on the air temperature, relative humidity and wind conditions.
Consumption

Coverage

As a water-resistive barrier (One coat):
35-40 mils wet / 23-27 mils dry 150-190 ft2 (14-17.6 m2)
Application steps

SUBSTRATE PREPARATION

  • The substrate should be flat and straight with no planar irregularities over 1/8 in. (3mm) within a 4 ft. (1.2m) span. Caution: Irregular substrates will produce inconsistent adhesion.
  • Protruding surface irregularities, including lipping at sheathing board edges, shall not exceed 1/32 in. (0.8mm).
  • Remove surface contaminants such as dust or dirt without damaging the substrate.Painted substrates must have the paint removed by methods which result in removal of a minimum of 90% percent of the paint from the surface area that will receive WeatherSeal Trowel WG. Any minor residual paint must be sound and well adhered, and not inhibit bond.
  • For additional options for surface preparation, contact Sika FacadesTechnical Support.

MIXING

  • Use clean equipment for mixing and preparation.
  • Do not add water. Stir PAREX® WeatherSeal Trowel-On WG to a uniform consistency. Avoid creating air bubbles or foam.
  • No additives of any kind, such as rapid binders, anti-freeze, accelerators, fillers, pigments, etc. should be added under any circumstances.

APPLICATION

Read the entire label before using this product.

  • Substrate surfaces shall be dry, clean, and sound, free of water repellents, form release agents, or other substances that may interfere with the bond.
  • Apply either SikaWall 9000 Sheathing Fabric  or Parex 355 4 oz. mesh embedded in PAREX® WeatherSeal Trowel-On WG to all:
    • Sheathing joints
    • Gaps in sheathing up to 1/4 in. (6mm) wide.
    • Open holes up to 1 in. (25mm) across. Correct larger gaps and holes by replacing sheathing.
    • Back flanges of track and flashing.
  • Embed 4 in. strips of either SikaWall Sheathing Fabric or Parex 355 4 oz. mesh by applying PAREX® WeatherSeal Trowel-On WG per application instructions to 4 in. of each side of the joint and embed the reinforcing fabric with a stainless steel trowel so that the color of the fabric is not visible.
  • PAREX® WeatherSeal Trowel-On WG is applied by trowel. PAREX® WeatherSeal Trowel-On WG that embeds SikaWall Sheathing Fabric may be applied by taping knife.
  • Cover the entire surface of the taped substrate with PAREX® WeatherSeal Trowel-On WG. The transparency of the PAREX® WeatherSeal Trowel-On WG is not an indication of the thickness.
  • PAREX® WeatherSeal Trowel-On WG with gauging aggregate is self gauging. It should be applied to the thickness of the aggregate. Drag marks indicate it is being applied too thin. Thicker application than required reduces coverage and extends setting and drying time.

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