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Structural Waterproofing - FAQs
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Procor® Fluid-Applied Questions
Procor is intended for use as either a below
grade and deck waterproofing material (with separate protection course),
or as an above-grade air and vapor barrier.
Procor waterproofing membranes may be applied
onto "green" concrete or over damp substrates. Remove any visible water
prior to application. Once applied, Procor membranes will not be affected
by light rain showers.
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Procor membranes are water-based and virtually
odorless. This makes them ideally suited for interior applications such
as kitchens, mechanical rooms, bathrooms, laboratories, and wet rooms.
Procor membranes are also appropriate for use in planters and other jobs
where the use of solvents is restricted.
Spray polyurethane foam insulation is compatible
with Procor membranes. It will adhere to Procor when used as an exterior
insulation in air and vapor barrier applications. Procor membranes adhere
well to cured polyurethane foam insulation.
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Procor 75 is a spray application material.
Procor 10 & 20 are applied by trowel. Procor may not be applied by brush,
roller or rubber squeegee.
Preprufe® Questions
An exceptionally strong mechanical bond
develops between Preprufe membranes and freshly poured concrete. The liquid
concrete becomes interlocked with the specially formulated adhesive layers
of the Preprufe membrane. The bond develops and increases in strength
as the concrete cures.
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Yes, Shotcrete bonds extremely well to Preprufe membranes, when the shotcrete is in full contact with the Preprufe. However, due to the nature of the shotcrete application, voids, rebar shadowing and pockets can be created between any waterproofing membrane (including Preprufe) and shotcrete foundation walls potentially compromising the integrity of the waterproofing system. These voids and pockets often link together forming channels which may result in areas of the shotcrete that are not in contact with the waterproofing membrane. If there is a breach in the waterproofing membrane, then these channels may allow water to travel between the waterproofing membrane and the shotcrete, eventually finding its way into the structure. Grace has developed a waterproofing system called Preprufe SCS that is specifically designed for shotcrete foundation walls. Preprufe SCS is currently the only waterproofing system Grace recommends for shotcrete foundation walls. For more information on Preprufe SCS, and an explanation of how it solves the challenges of waterproofing shotcrete foundation walls, please click on the following link: LINK TO PREPRUFE SCS.
No. The release liner should be removed during
application. Preprufe membranes are designed to take reasonable construction
site abuse and it is difficult to remove release liner once steel has
been placed.
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Preprufe 160R is designed for vertical "blind-side"
wall applications such as against timber lagging or sheet piling and is
installed against a properly prepared substrate prior to concrete placement.
Preprufe 300R is designed for horizontal sub
slab or split slab applications. The membrane is applied directly to compacted
earth or a mud slab and concrete is subsequently placed directly against
the membrane.
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Bituthene® Membrane Questions
Bituthene 4000 is used in conjunction with the water based Bituthene 4000 Surface Conditioner and is designed to provide superior adhesion down to -4°C (25°F). Bituthene 3000 and Bituthene Low Temperature Membrane are used in conjunction with the solvent-based Bituthene Primer B2, Bituthene Primer B2 LVC or with the water-based Bituthene WP-3000 Primer. Bituthene 3000 can be applied down to 5°C (40°F) and Bituthene Low Temperature Membrane can be applied down to -4°C (60°F).
No. Bituthene membranes are not designed to
withstand the high temperatures that a roof underlayment product is exposed
to. Grace Ice & Water Shield® roof leak
protection is specifically designed to meet the demands of this application.
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Protection of Bituthene 3000, Bituthene 4000,
and Bituthene Low Temperature Membranes from site damage is critical to
the success of the waterproofing system. Recommended protection courses
for use over Bituthene membranes include Hydroduct®
drainage composites, 3 mm (0.125 in.) or 6 mm (0.25 in.) Asphaltic Hardboard,
25 mm (1 in.) expanded polystyrene board (vertical applications only),
or 6 mm (0.25 in.) extruded polystyrene fanfold board (vertical applications
only). Bituthene 5000 does not require a protection course prior to placement
of asphalt concrete.
Bituthene membranes are designed to be
installed within specific application temperature ranges as given below:
Bituthene 4000
Bituthene 3000
Bituthene Low Temperature Membrane
Bituthene 5000 |
25°F and above
40°F and above
25°F - 60°F
40°F and above |
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A minimum cure period of 7 days for normal
weight structural concrete and 14 days for light weight structural concrete
is recommended prior to installing Bituthene membranes. Bituthene Primer
B2 may be used when there is a need to install membrane over green concrete.
Bituthene membranes are subject to damage from heat
and sunlight and should be covered as soon as possible. Protection should
be applied the same day the membrane is applied or immediately after
the 24 hour flood test.
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Bituthene 3000, Bituthene System 4000, Bituthene
5000 and Bituthene Low Temperature Membranes are sold in 200 ft2
rolls that are 0.9m x 20m (3 ft. wide by 67 ft. long).
Primer B2 will dry in one hour in cold applications
and can also be used on damp surfaces or green concrete.
Hydroduct® Drainage Questions
Hydroduct 220 should be used with waterproofing
membranes in vertical applications and Hydroduct 660 in horizontal applications.
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Hydroduct drainage composites with an integral
backing film provide exceptional drainage capabilities and also provide
protection for all waterproofing membranes.
Bitustik Tape, a highly aggressive two sided
tape, is used to adhere the Hydroduct 220 drainage composites to Bituthene
membranes. Since Procor fluid applied membranes are tacky, the drainage
composite can be installed over Procor without an adhesive.
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Yes, fresh concrete can be placed directly
over Hydroduct 660 drainage composite.
Perm-A-Barrier® Wall
Membrane Questions
Perm-A-Barrier Wall Membrane should be covered
within 30 days after installation.
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The softening point of Perm-A-Barrier Wall
Membrane is between 82-93 °C (180-200 °F). Temperatures greater
than this may cause the membrane to liquefy and drip.
Perm-A-Barrier Wall Membrane can be applied
over asphaltic dampproofing when fully cured. Priming may be necessary
to enhance the adhesion.
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Perm-A-Barrier Wall Membrane should not be
installed over EPDM. However, EPDM can be installed over Perm-A-Barrier
Wall Membrane.
Using a metal drip edge in conjunction with
Perm-A-Barrier Wall Membrane would be a "belt and suspenders" detail,
but is not necessary.
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