Installation GuideAU-1 LAB
AU-1 LAB
Application Guide
Liquid Applied Air, Water, and Flashing Barrier
Product Description
AU-1 LAB is a high performance, single component, Styrene Butadiene Resin (SBR) elastomeric liquid weather resistive barrier and flashing membrane. This weather resistive barrier (WRB) functions as both a membrane and flashing and is designed to protect structures from moisture intrusion, air leakage, and environmental stressors. This low-odor, waterproofing barrier can be sprayed, brushed, rolled or troweled, and requires no primer. It is formulated to provide a permanent, breathable waterproof seal with excellent adhesion to most common substrates, including green concrete. It is low VOC, easy to apply, and is easy to clean with soap & water. AU-1 LAB can be used on rough openings, around penetrations and on broad wall applications as a weather-resistive barrier.
Product Specifications
- Vehicle
- VOC
- Service Temp
- Application Temp
- Life Expectancy
- Shelf Life
Tack Free
4 hrs
Recoat
6-8 hrs
Full Cure
24-72 hrs
Compatible Substrates
AU-1 LAB adheres to most common building substrates without requiring a primer.
Masonry
Concrete
Aluminum
Brick
Wood
Vinyl
Exterior Gypsum
OSB/Plywood
Stucco
Building Systems
Surface Preparation
- Clean SurfaceSurfaces must be free of all dirt, dust, oil, mildew, frost or other contaminants.
- Repair DamageAny structural damage must be repaired prior to application.
- Seal CracksNon-structural cracks or joints up to ½" should be sealed with AU-1 Elastomeric Construction Sealant prior to application.
No Primer Needed
A primer is not needed for most common substrates. AU-1 LAB can be applied to green concrete.
- Adhesion TestingAdhesion testing is recommended to ensure proper adhesion to the substrate.
Application: for use as a Liquid Applied Flashing
Use a brush, roller, sprayer or trowel to apply AU-1 LAB to a minimum of 30 wet mils over the desired area of the
rough opening including the exterior surface. For airless spray application: a 1.15 – 2.5 GPM (gallons per minute) sprayer
is recommended with a tip orifice size of .021 - .025 at 3000 PSI. For roller application, a minimum ¾” nap high quality
roller is recommended. Two coats may be required to achieve 30 wet mils. Application should be performed in a manner
resulting in the membrane surface being free of openings or pinholes. Apply additional AU-1 LAB as needed to ensure a
uniform coating with no pinholes. Allow the product to become tack-free before applying additional coats. Product may
be applied up to 60 wet mils without sagging. Allow product to skin before installing any components into rough openings.
Skin times may vary by humidity and conditions. Check local building codes for additional recommendations or
requirements.
NOT INTENDED FOR AREAS THAT WILL BE SUBMERGED IN WATER. KEEP PRODUCT FROM FREEZING PRIOR
TO APPLICATION / CURING. NOT FOR FOOD CONTACT SURFACES. PRODUCT CANNOT BE SANDED.
CMU or Precast Panel Installation:
OSB/Plywood/Gypsum Sheathing Installation:
Application: for use as a Weather Resistive Barrier (WRB)
Preparation:
For gaps smaller than ¼” no special prep work is needed to apply AU-1 LAB. Simply “flood coat” the gap liberally with AU-1 LAB into and around the gap. Ensure even coverage with no pinholes.
Gap sized ¼” – ½” need to be filled with AU-1 Construction Sealant or mesh tape imbedded in AU-1 LAB.
OPTION 1 (RECOMMENDED):
Generously apply a large bead of AU-1 Construction Sealant into board seams and strike flush. Allow the sealant to become tack-free before applying AU-1 LAB.
OPTION 2:
Using a dry, clean joint knife or trowel apply AU-1 LAB over all seams and corners. Imbed a compatible mesh tape securely in the AU-1 LAB. Trowel AU-1 LAB over the mesh tape, ensuring that the AU-1 LAB extends a minimum of 1” beyond the edge of the seam. Ensure an even coat with no pinholes. Allow product to become tack-free before applying AU-1 LAB across entire exterior surface. See diagram below.
For gaps larger than ½” consult local sales rep. Sheathing fasteners should be flush with the surface.
Application:
Once all seams and rough openings have been properly prepared as described above, use a brush, roller, or airless sprayer to apply AU-1 LAB to a minimum of 30 wet mils over the exterior surface. Use a wet mil gauge to ensure minimum of 30 wet mils is achieved.
Airless Spray (Recommended)
A 1.15 – 2.5 GPM (gallons per minute) sprayer is recommended with a tip orifice size of .021 - .025 at 3000 PSI. Product should be applied in a vertical and horizontal cross-hatch pattern in one pass to build a minimum of 30 wet mils. Product may be applied up to 60 wet mils without sagging. Use a wet mil gauge to ensure proper mill thickness. Inspect coating to ensure a uniform, pinhole free membrane. Touch up pinholes or gaps in membrane with a chip brush as needed. Allow product to become tack-free before installing cladding or any components into rough openings. Tack-free times may vary by humidity and conditions. Check local building codes for additional recommendations or requirements.
Roller Application
A minimum ¾” nap high-quality roller is recommended. Two coats will be required to achieve 30 wet mils. Application should be performed in a manner ensuring the membrane surface is free of any openings or pinholes. Allow the product to become tack-free before applying second coat. Allow final coat to become tack-free before installing cladding or any components into rough openings. Tack-free times may vary by humidity and conditions. Check local building codes for additional recommendations or requirements.
Post-Application
AU-1 LAB should be covered within 6 months after application to prevent possible UV damage. Install proper cladding as required by manufacturer instructions. AU-1 LAB is self-sealing and does not require additional sealing around properly installed cladding fasteners.
Ensure exterior walls are capped or protected to prevent moisture intrusion. Ensure barrier is integrated with roofing system where wall meets roof / soffit, etc. Ensure barrier is integrated with other building wrap / waterproofing systems per manufacturer's instructions.
NOT INTENDED FOR AREAS THAT WILL BE SUBMERGED IN WATER OR BELOW GRADE. KEEP PRODUCT FROM FREEZING PRIOR TO APPLICATION / CURING. NOT FOR FOOD CONTACT SURFACES. NOT INTENDED FOR ROOFING APPLICATIONS. PRODUCT CANNOT BE SANDED.
Clean Up
Immediately after use, clean uncured material and tools with soap and water. Remove cured membrane by cutting with a sharp-edged tool.
Limitations
Only apply AU-1 Liquid-Applied Flashing when product, surface, and air temperatures are above 40° F and rising. Do not apply on surfaces exceeding 160° F. Do not apply to frozen substrates, prior to extreme weather, or before heavy rain. AU-1 Liquid-Applied Flashing is not for use in below-grade applications, or in areas where frequent water ponding may occur. Product is not intended for use on surfaces where it will be permanently exposed.
Storage
AU-1 Liquid-Applied Flashing should be stored in original, unopened containers, away from heat and direct sunlight. Product should be kept from freezing. When stored correctly, product will have a shelf life of 18 months.
WARNING!
IRRITATING TO SKIN, EYES AND RESPIRATORY TRACT. Harmful if swallowed, inhaled or absorbed through the skin. May cause allergic skin reactions and/or central nervous system depression. Adverse reproduction effects have been reported in animals. May cause adverse kidney effects. Avoid contact with eyes, skin and clothing. Use in well-ventilated area. Wear eye, skin, and respiratory protection. Eye contact: Immediately flush with water for 15 minutes and get medical attention immediately. If swallowed: Do not induce vomiting. Give large quantities of water and get medical attention. Never give anything by mouth to an unconscious person. For health information, refer to Safety Data Sheet or call Chemtrec at 800-424-9300.
KEEP OUT OF REACH OF CHILDREN
WARNING! This product can expose you to chemicals, including petroleum distillates, which is known to the State of California to cause birth defects, reproductive harm, and/or cancer. For more information, visit www.P65Warnings.ca.gov.
Safety Data Sheets (SDS) available upon request via towersealants.com or by calling 866-897-7568
Warranty
TOWER Sealants warrants this product to be free from manufacturing defects. The installer is responsible for the testing of this product on the surfaces of the targeted application for compatibility and performance prior to use. This is the sole and exclusive remedy and liability for defects or failure of this product. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, WRITTEN OR ORAL, STATUTORY, EXPRESSED OR IMPLIED; INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS.