PAREX® WeatherSeal Spray & Roll-On
PAREX® WeatherSeal Spray & Roll-On is a 100% acrylic elastomeric air barrier and water-restitive membrane that can be either rolled, brushed, or spray applied. It is highly flexible and can bridge cracks and accommodate substrate movements up to 1/32 in. (0.8mm). When used with in combination with SikaWall Sheathing Fabric it can bridge gaps up to 1/4 in. (6mm) gaps at sheathing board joints .
- One continuous air/water-resisitve barrier for buildings with multiple claddings (can be used with most code-compliant claddings).
- Code compliant with ASTM E2570
- 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 the application of up to a 6 month outdoor exposure rating (surface must be clean of dirt and contaminants before the application of EIFS adhesive)
Usage
Designed for use as water-resistive barrier behind exterior claddings.Advantages
- One continuous air/water-resisitve barrier for buildings with multiple claddings (can be used with most code-compliant claddings).
- Code compliant with ASTM E2570
- 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 the application of up to 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
Shelf Life
Two (2) years, properly stored in original containers.
Storage Conditions
- Protect materials during transportation to avoid physical damage. Store in a cool, dry place protected from freezing, extreme heat and direct sun. Store at no less than 40°F (4.4°C).
- Do not stack pallets.
Volatile organic compound (VOC) content
42 grams per liter
Substrate
Water-resistive barrier coating for application to:
- Glass mat gypsum sheathing
- Exterior-grade gypsum sheathing
- Exposure 1 exterior plywood
- Exposure 1 OSB
- Concrete
- CMU
- Brick
- Cement board sheathing (Consult “Acceptable Substrate and Area of Use” Technical bulletin for more details)
Tensile Strength
| TEST | METHOD | ICC and ASTM E2570 Criteria | RESULTS |
| Tensile Bond | ASTM D4541 | >15 psi | 28 psi |
| Tensile Bond Strength | ASTM E 2134/ | Minimum 15 psi (104 kPa) | Pass all listed substrates and flashing materials |
Elongation
| Elongation | ASTM D412 | No Criteria | 360% |
| Mandrel Bend | ASTM D522 | 1/8" mandrel, minus 40º F/C | No Cracks |
Resistance to Weathering
| TEST | METHOD | ICC and ASTM E2570 Criteria | RESULTS |
| Accelerated Weathering | AC 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 Resistance | ASTM E 2485 | 10 Cycles | Pass: No Deleterious Effects |
| Hydrostatic Pressure Test | AATCC 127 (Water Column) | Resist 21.6 in (55 cm) water for 5 hours before and after aging | Pass: No water penetration |
| Water Resistance | ASTM D 2247 | 14 Days | Pass: No Deleterious Effects. |
| Water Penetration | ASTM E331 | 2.86 psf (137 Pa) for 15 minutes | Pass: 25.4 psf (1216 Pa) for 165 minutes |
| Water Penetration | ASTM E331 | Tested after Structural Loading, Racking and Restrained Environmental Cycling at 2.86 psf (137 Pa) for 15 minutes | Pass: No Water Penetration |
| Water vapor transmission | ASTM E96 Procedure B | Vapor Permeable | 12.0 perms |
| Weathering | ICC ES AC 212/ ASTM E2570 | 210 hours of UV Exposure, 25 cycles of accelerated weathering, 21.6 in (549mm) water column for 5 hours | Pass |
| Wind Driven Rain | F.S. TT-C-555B | No Criteria | Pass |
Durability
| Nail Seal ability | ASTM D1970 | No Criteria | Pass: 5 inches of water |
| Racking | ASTM E72 | Deflection at ⅛ in (3.2mm) | Pass: No cracking at field, joints or flashing connection |
| Restrained Environmental | ICC ES AC 212 / ASTM E2570 | 5 Cycles of wetting and drying | Pass: No cracking at field, joints or flashing connection |
| Structural Loading | ASTM E1233 Procedure A | 10 Cycles @ 80% design load | Pass: No cracking at field, joints or flashing connection |
Air permeance
| Air Infiltration | ASTM E2178 | Calculated 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 Assemblies | ASTM E2357 | ASTM E2357 ****IS THIS TYPO? | Pass: < 0.2 L/s·m2 at 75 Pa) (< 0.04 cfm / ft2 at 1.57 psf) |
| Air Leakage | ASTM E283 | No Criteria | < 0.004 cfm/ft2 |
Application
Drying Time
Typically 24 hours depending upon temperature, humidity and substrate. Additional coats may be applied within 1-4 hours depending on conditions.
Coverage
| Sheathing | Minimum Coats on Average required for full coverage | Average Coverage Per Coat/Pail | Application Notes |
| Embedding 4” Wide WeatherTech Sheathing Joint Tape | - | -/500 lineal feet | - |
| Fiberglass Faced & Exterior Grade Gypsum Sheathing | 1 coat - 10-12 Wet Mils | 450-500 ft2 | Thicker applications can cause sagging of the product. |
| Exposure 1 Plywood | 2 coats - 10-12 Wet Mils per coat | 500 ft2 per coat/ 250-300 ft2 | Normal irregularities in the profile will produce variation in dry film thickness. |
| Exposure 1 Oriented Strand Board | 2 coats - 10-12 Wet Mils per Coat | 500 ft2 per coat /250-300 ft2 | The edges of the exposed wood strands can sometimes swell from the application of the Weatherseal causing breaks in the coating, which must be touched up before application of the cladding. |
| Fiber-Mat Reinforced Cementitious Backer Units | 2 coats - 10-12 Wet Mils per coat | 500 ft2 per coat/250-300 ft2 | - |
| Cast or Precast concrete | 1 coat - 10-12 Wet Mils | 350-400 ft2 | If voids exist, they must be filled or leveled with Stucco Level Coat before application of the PAREX® WeatherSeal Spray & Roll-On. |
| Concrete Masonry Units | 2 coats- 10- 12 Wet mils per coat | 350-400 ft2 per coat/175-200 ft2 | If voids still exist after 2 coats – additional coats may be necessary, coverage is dependant upon porosity. |
| Concrete Masonry Units | 1 coat after skimming with Sika Wall Stucco Surface Leveler - 10-12 Wet Mils | 350-400 ft2 per coat/350-400 ft2 | Weatherseal Spray and Roll-on may be applied in a single coat over CMU if leveled out with SikaWall Stucco Surface Leveler before application of PAREX® WeatherSeal Spray & Roll-On. |
SUBSTRATE PREPARATION
- Remove surface contaminants such as dust or dirt without damaging the substrate.
- Painted substrates must have the paint removed by methods of removal to expose 90% percent of the surface having paint. Any minor residual paint should be well-adhered, and substrate must remain sound. Surface preparation methods should avoid damaging or compromising the substrate.
- For additional options for surface preparation, contact Sika FacadesTechnical Support.
MIXING
- Use clean equipment for mixing and preparation.
- Stir PAREX® WeatherSeal Spray & Roll-On to a uniform consistency. Avoid creating air bubbles or foam.
- For some spray applications it may be necessary to thin PAREX® WeatherSeal Spray & Roll-On slightly. Use only clean potable water and add sparingly, never more than 16 oz (0.5L) per pail, because thinning can reduce film thickness.
- 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 Product Data Sheet before using this product.
- Install the substrate according to manufacturer’s recommendation and according to the Suitable Substrate and Area of Use Technical Bulletin.
- PAREX® WeatherSeal Spray & Roll-On is easily applied with roller, brush or suitable spray equipment. For sprayed applications, See Sika Facades Technical Bulletin for Spraying PAREX® WeatherSeal Spray & Roll-On.
- For spray applications, strain the material using a paint strainer.
ROLLER APPLICATION
- Use 3/4 in. to 1 1/4 in. (19-32mm) nap roller designed for applying latex paints.
Apply WeatherSeal Spray & Roll-On approximately 6 in. (150mm) wide centered over:
- Sheathing joints
- Gaps in sheathing up to 1/4 in. (6mm) wide
- Open holes up to 1 in. (25mm) across
- Back flanges of flashings and track
- Immediately place the SikaWall 9000 centered sheathing fabric centered in the wet PAREX® WeatherSeal Spray & Roll-On. Using a trowel or taping knife over the sheathing joint tape press the fabric firmly into the wet PAREX® WeatherSeal Spray & Roll-On the WeatherSeal Spray and Roll-On to fully embed the sheathng fabric. Do not let PAREX® WeatherSeal Spray & Roll-On skin over before applying and embedding SikaWall 9000 sheathing fabric. Work in small enough areas to ensure that PAREX® WeatherSeal Spray & Roll-On is wet when SikaWall 9000 sheathing fabric is fully embedded. If PAREX® WeatherSeal Spray & Roll-On does skin over before embedding SikaWall 9000 Sheathing Fabric, scrape off semi-liquid PAREX® WeatherSeal Spray & Roll-On or let it dry and re-apply. Correct larger gaps and holes by replacing sheathing.
- An alternative method for joint treatment is to use SikaWall MaxFlash. Apply SikaWall MaxFlash flush with the surface. Overlap both sides of the gap onto sheathing min 1”. See SikaWall MaxFlash Data Sheet for details
- After SikaWall 9000 Sheathing Fabric is completely embedded, apply PAREX® WeatherSeal Spray & Roll-On over the entire outer sheathing surface, at a rate of not more than 100 ft2 per gal. (2.4 m2. per L), approximately 10–12 wet mils in a single coat. Normal irregularities in the profile will occur in OSB, plywood, cement board and CMU, therefore a variation in dry film thickness is normal. The transparency of the dry PAREX® WeatherSeal Spray & Roll-On is not an indication of the thickness.
- For specific installation details refer to Parex Water Resistive Barriers Details at https://usa.sika.com/parex