Sto ExtraSeal:
Air Barrier & Adhesive in One


Sto ExtraSeal is a single component air barrier and continuous insulation adhesive for use on vertical above grade concrete, concrete masonry units (CMU), and glass mat gypsum sheathing (GMG) wall surfaces. Its unique qualities let it function as an air barrier and water resistive barrier (WRB) for direct applied stucco on CMU, or as continuous insulation (ci) adhesive for EPS, XPS or PI rigid insulation boards on CMU and GMG.

ExtraSeal provides durable substrate protection and air leakage resistance, and it acts as an adhesive compatible with most commonly available continuous rigid insulation boards.

Features include:
• A fully adhered structural air barrier material, for reduced energy consumption, resistance to damage by wind and stack effect, and no air leakage between substrate and air barrier. 
• A single component multipurpose product which simplifies mixing, application and handling on the job site for a variety of applications.
• A high build and leveling capability which does not require flush CMU mortar joints; it fills and levels rough concrete or CMU wall surfaces.

The product enables compliance with ci (continuous insulation) requirements of the IBC, IRC, ASHRAE 90.1 and other codes and standards. It is vapor permeable, minimizing the risk of condensation in walls and water entrapment in walls. It resists water penetration, minimizing the risk of water damage to substrates and water leakage to the interior. Since it is a polymer-modified cement based product, it has excellent adhesion, increased durability and freeze / thaw resistance, and is compatible with high pH substrates. 

Compared to other liquid applied products, Sto ExtraSeal is fast drying in both cold and wet weather conditions, reducing the risk of water and freeze damage in wet and/or cold weather. Same day application for the air barrier and scratch coat, or air barrier and adhesive can occur in most cases. It is made with recycled content and has Zero-VOCs, which means it can qualify for LEED points, or credits in other sustainable design programs. 

Sto ExtraSeal is part of the StoEnergy Guard family of products, which together create an integrated cavity wall solution that is used for substrate protection, energy efficiency and energy conservation under multiple cladding types, including stone, siding, stucco and more. Air barriers have become a standard for better energy efficiency and lower energy costs.

www.stocorp.com/stoenergyguard • 800-221-2397









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