Download - Self-Adhesive, Rubberized Asphalt
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Veronica P. Canteras
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What is a Wall Flashing ? Flashing refers to thin continuous pieces of sheet
metal or other impervious material installed toprevent the passage of water into a structure from an
angle or joint. Flashing generally operates on theprinciple that, for water to penetrate a joint, it mustwork itself upward against the force of gravity or in thecase of wind-driven rain, it would have to follow a
tortuous path during which the driving force will bedissipated. Exterior building materials can beconfigured with a non-continuous profile to defeatwater surface tension.
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Flashing may be exposed or concealed.Exposed flashing is usually of a sheet metal,
such as aluminium, copper, painted
galvanized steel, stainless steel, zinc alloy,terne metal, lead or lead-coated copper.
Metal flashing should be provided with
expansion joints on long runs to preventdeformation of the metal sheets.
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DescriptionSelf-adhesive, rubberized asphalt/polyethylene
flashing tapes for cavity wall applications are ideal
for protecting the building superstructure from thedamaging effects of the elements.By minimizing
air and water vapor flow through the building
exterior.
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DescriptionSelf-adhesive, rubberized asphalt/polyethylene
flashing tapes for cavity wall applications are ideal
for protecting the building superstructure from thedamaging effects of the elements.By minimizing
air and water vapor flow through the building
exterior.
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Description Prevent premature deterioration of the building
envelope
Enhance thermal performance of the structure
and save energy costs
Improve comfort for the building occupants
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Advantages Fully bondedcontinuous adhesion to the
substrate resists wind loads and prevents water
tracking behind the tape
Waterproof and impermeable to moisture
impermeable to the passage of liquid water and
water vapor
Crosslaminated filmprovides dimensional
stability, high tearstrength, puncture and impact
resistance
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Advantages Cold appliedno flame hazard;self-adhesive
overlaps ensure continuity
Flexibleaccommodates minorsettlement and
shrinkage movement
Controlled thicknessfactory made sheet
ensures constant, non-variable site application
Aggressive, conformable adhesivecreates
100% watertight laps and allowsself-sealing
around mechanical fasteners
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Advantages Faster 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.
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System Components Perm-A-BarrierWall Flashing40mil(1mm)
total thicknessself-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, crosslaminated polyethylene film.
The rolls are interwound with disposable
silicone-coated release sheet.
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System Components
Bituthene MasticTrowel Grade
rubberizedasphalt mastic forsealing around penetrations,
terminations, brick ties, etc.
BitutheneLiquid Membranetwo component,trowel grade, asphalt modified urethane
forsealing patches, terminations, brick ties, etc.
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System Components
PrimerPlus
water-basedvapor permeable primerused to facilitate tenacious adhesion of Barrier selfadhered membranes to the substrate
Primerhigh tack, water- based primer for use
with Barrier Wall Flashing on cementitious andexterior gypsum wallboards
Bituthene Primer B2used to prime green
concrete or damp substrates Bituthene PrimerB2LVClow VOCprimer
used to prime green concrete or damp surfaces
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System Components
Bituthene MasticTrowel Grade
rubberizedasphalt mastic forsealing around penetrations,
terminations, brick ties, etc.
BitutheneLiquid Membranetwo component,trowel grade, asphalt modified urethane
forsealing patches, terminations, brick ties, etc.
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Preparatory Work
Apply Wall Flashing and accessories only in fairweather when air and surface
temperatures are above 25F (-4C).
Wherever wallflashing isto be applied, the surface
must be smooth, clean, dry and free of voids,
spalled areas, loose substrate, loose nails,sharp
protrusions or other matterthat will hinderthe
adhesion or uniformity ofthe wallflashing
installation.Clean loose dust or dirtfrom the
surface by wiping with a clean dry cloth or a brush.
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Flashing Application Pre-cut Wall Flashing to easilyhandled lengths.
Peel release paper from roll toexpose rubberizedasphalt and carefully position flashingagainstsubstrate.
Press firmly into place with a steel hand roller or
the back of a utility knife as soon as possible, fullyadhering the flashing to the substrate to prevent
water from migrating under the Wall Flashing.
Form end dams at horizontal flashingterminations to prevent water entry. Overlapadjacent pieces 2 in. (51 mm) and roll overlap withasteel hand roller.