Perm-A-Barrier Wall Flashing

Advantages

• Fully bondedcontinuous adhesion to the substrate resists wind loads and prevents water tracking behind the tape
• Waterproof and virtually impermeable to moisturevirtually impermeable to the passage of liquid water and vapor
• Cross laminated filmprovides dimensional stability, high tear strength, puncture and impact resistance
• Cold appliedno flame hazard; self-adhesive overlaps ensure continuity
• Flexibleaccommodates minor settlement and shrinkage movement
• Controlled thicknessfactory made sheet ensures constant, non-variable site application
• Aggressive, conformable adhesivecreates 100% watertight laps and allows self-sealing around mechanical fasteners
• Unique green color and logohighly differentiated on the job site from other flashing types and enables easy identification of damage
• Ripcord® Split Release on Demandfaster application in the straight-aways, ease of membrane positioning in detailed areas
• Foldless release paperfewer edge catches, 180° pull-back, ease of membrane cutting (single cuts) and membrane positioning, quicker one-man installs

System Components

• Perm-A-BarrierWall Flashing40 mil (1 mm) total thickness self-adhesive, cold applied tape consisting of 32 mils (0.8 mm) of rubberized asphalt integrally bonded to a 8 mil (0.2 mm) high density, cross laminated polyethylene film. The rolls are interwound with disposable silicone-coated release sheet.
• Perm-A-BarrierWall Membranesair and vapor barrier membranes for use in cavity wall applications.
• Perm-A-BarrierWB Primerhigh tack, waterbased primer for use on exterior wallboards
• Bituthene® Mastic Trowel Graderubberized asphalt mastic for sealing around penetrations, terminations, brick ties, etc.

Installation

Safety
Perm-A-Barrier products must be handled properly. Vapors from the mastic and solvent-based primer are harmful and flammable. For these products, the best available information on safe handling, storage, personal protection, health and environmental considerations has been gathered. Refer to product label and Material Safety Data Sheet before use. All users should acquaint themselves with this information prior to working with the material. Carefully read detailed precaution statements on the product labels and MSDS before use. MSDSs can be obtained from our web site at www.graceconstruction.com or by contacting us toll free at 866-333-3SBM (3726).

Preparatory Work
Apply Perm-A-BarrierWall Flashing and accessories only in fair weather when air and surface temperatures are above 25°F (-4°C). Wherever wall flashing is to be applied, the surface must be smooth, clean, dry and free of voids, spalled areas, loose substrate, loose nails, sharp protrusions or other matter that will hinder the adhesion or uniformity of the wall flashing installation. Clean loose dust or dirt from the surface by wiping with a clean dry cloth or a brush.

Conditioning and Priming
Use Perm-A-BarrierWB Primer to enhance adhesion on dusty cementitious substrates. Perm-A-BarrierWB Primer is a water-based primer which imparts an aggressive, high tack finish on the treated substrate. It is specifically designed to facilitate tenacious adhesion of Perm-A-BarrierWall Flashing, Perm-A-BarrierWall Membrane, Grace underlayments and Grace Vycor® Self-Adhered Flashings to various substrates including DensGlass Gold® (refer to relevant product data sheets). It will cover approximately 250–350 ft2/gal (6–8 m2/L) when applied with a roller. A synthetic, 1/2 in. (13 mm) nap roller has been found to be very successful. A moderately thick coating should be applied and rolled out evenly. A properly applied coating will have uniform coverage and leave a tacky finish to the surface when dry.Apply primer in dry weather with ambient and substrate temperatures above 25°F (-4°C). Surface must be dry and clean, free from frost, dirt, grease, oil or other contaminants. Failure to remove excessive dust may result in compromised adhesion of the membrane. Allow primer to dry completely before application of the flashing. In cooler or humid conditions, priming may be done in advance. If primed surface is exposed for more than 7 days, or if significant dust or dirt accumulates on the surface, re-prime with a thin coat of Perm-A-BarrierWB Primer. The drying time could vary from 15 minutes (< 90°F (>32°C), windy, under the sun) to 3 hours (cold and no wind), depending on the weather condition. For 90°F (32°C) or greater, 45 minutes to one hour; 50°F (10°C) to 90°F (32°C), 1–3 hours; less than 50°F (10°C) 3 hours or more. Bituthene Primer B2 is used to prime green concrete or damp substrates. Apply to clean surface at a coverage rate of 250–350 ft2/gal (6–8 m2/L). Allow primer to dry completely (approximately 1 hour dependent on weather condition) before application of wall flashing.

Flashing Application
Pre-cut Perm-A-BarrierWall Flashing to easily handled lengths. Peel release paper from roll to expose rubberized asphalt and carefully position flashing against substrate. Ripcord, a Split Release on Demand feature embedded in the membrane, also makes Perm-A-BarrierWall Flashing easy to position in detailed areas. Press firmly into place with a steel hand roller or the back of a utility knife as soon as possible, fully adhering the flashing to the substrate to prevent water from migrating under the Perm-A-BarrierWall Flashing. Form end dams at horizontal flashing terminations to prevent water entry. Overlap adjacent pieces 2 in. (51 mm) and roll overlap with a steel hand roller. Apply a bead of Bituthene Mastic along all laps, seams, top edges, cuts and penetrations and trowel into place. Lay or trim edges of Perm-A-Barrier Wall Flashing 1/2 in. (13 mm) back from the face of the masonry. No reglet is necessary when installing Perm-A-BarrierWall Flashing to vertical surfaces. Complete installation instructions and details are available upon request. If wrinkles develop, carefully cut out affected area and replace in similar procedure outlined above. The repair piece must be pressed into place with a hand roller as soon as possible to ensure continuous and intimate contact with the substrate.

Protection
Perm-A-BarrierWall Flashing must be protected from damage from other trades or construction materials.

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