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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.