AU-1 LAB – Liquid Applied Barrier

Description

AU-1 LAB is a high performance, single component, Styrene Butadiene Resin (SBR) elastomeric liquid weather resistive barrier and flashing membrane. This weather resistant 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, or rolled, 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.

Packaging

Compatible Substrates

Compatible Systems

Stucco, EIFS, Foamboard, Exterior Cladding Systems, Housewraps — compatible with most coatings and sealants.

Surface Preparation

Surfaces to be free of all dirt, dust, oil, mildew, frost or other contaminants. Any structural damage must be repaired prior to application. Any non-structural cracks or joints up to ½″ should be sealed with AU-1 Elastomeric Construction Sealant prior to AU-1 LAB application. Protect property and surfaces not to be applied with membrane.

Mixing

Do not induce air if product needs to be mixed. Mix at slow speeds. Do not dilute product by adding water.

Application

Use a brush, sprayer, or roller to apply AU-1 LAB to a minimum of 30 wet mils over the desired area of the rough opening, including the exterior surface. Application should be done in a manner resulting in the membrane surface being free of openings or pinholes. AU-1 LAB may be applied up to 60 wet mils without sagging if required, due to substrate porosity. Backrolling is recommended after spray application. Allow product to skin before installing any components onto cladding or 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 from freezing. Not for food contact surfaces. Product cannot be sanded.

Spray Equipment

AU-1 LAB is compatible with most airless spray equipment manufacturers. Recommended tip orifice size: .021–.025. Recommended pressure: 3000 PSI. Recommended GPM: 1.15–2.5. Additional details are available in the AU-1 LAB Installation Guide.

Coverage

Approximately 50 sq ft per gallon to achieve 30 wet mils. Coverage will vary greatly depending on the porosity of the substrate and application method.

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 LAB 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 LAB is not for use in below-grade applications, or in areas where frequent water ponding may occur. Product can be exposed to weather and UV for up to 9 months before requiring coverage via cladding or coating. Product is not intended for use on surfaces where it will be permanently exposed.

Storage

AU-1 LAB 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.

Certification & Testing

ABAA Air Barrier Association of America Compliance Testing

AAMA 714-22: Liquid-Applied Flashing Testing

*This TDS lists water vapor permeability as 13 perms under AAMA 714-22 testing. That's different from the "16 perms" figure on the wholesale page's FAQ content — use 13 perms (the TDS number) as the source of truth and correct the wholesale page.

Safety

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 a 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 the Safety Data Sheet or call ChemTrec at 800-424-9300. Keep out of reach of children.

⚠ This product can expose you to chemicals, including petroleum distillates, 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) are available upon request via towersealants.com or by calling 866-897-7568.