Reliable
Innovative
MegaSeal® Solutions
Surface applied capillary waterproofing system for concrete and block work
DESCRIPTION APPLICATION GUIDELINES New Construction
The MegaSeal waterproofing system ensures a total and
The vast majority of leaking water retaining (orexcluding)
permanent solution to water leakage, ingress, or seepage in
structures constructed of sound dense concrete, leak only at
concrete structures or any cementitious substrate. The forma-
construction or day work joints. Costly remedial work can be
tion and development of insoluble crystals into water bearing
avoided by the use of MegaSeal as a dry shake onto the hori-
capillaries and interstices effectively blocks the further passage
zontal surfaces of joints or as a slurry application on vertical
of water.
surfaces.
Supplied as a powder and mixed to a slurry consistency with po-
In conditions of high-water table MegaSeal may be applied
table water. MegaSeal is applied directly to concrete, block-
as a slurry or dry shake over blinding concrete immediately
work or cement renders in areas where general waterproofing
prior to casting the slab. This sandwich system will prevent in-
is required. In powder form, the product may be used as a
gress of ground water preventing deterioration, and damp-
dry shake on horizontal construction joints.
ness or flooding. Foundations should be treated on the ex-
MegaSeal consists of a blend of moisture activated chemi- ternal face wherever possible, as should the face of construc-
cals, high grade silica aggregates and selected cements. tion joints.
Premixed powders consisting of selected Portland cement MegaSeal can be applied immediately after the formwork has
blended with an activating chemical and high-grade quartz. been removed, as the water curing process required for
MegaSeal will also ensure full hydration of the concrete.
If the treatment is to be exposed and an aesthetically
TYPICAL APPLICATIONS pleasing finish is required, the MegaSeal after curing, should re-
ceive as and/cement render on which to apply the desired finish.
WATER RETAINING WATER EXCLUDING
Existing structures
Water tanks / towers Basements Structures subject to water leakage or ingress, must be
Reservoirs Tunnels carefully inspected to determine the cause. Any water pres-
Water treatment work Inspection pits ent should be cleared away so that a thorough survey can be
Dams Foundations conducted. Static cracks over 1mm must be chased out, damp-
Canals Retaining walls ened down and repaired with MegaPlug. Dynamic cracks
Harbours Lift shafts should be sealed by injection with MegaPlug or MegaInject .
Concrete pipes Construction joints
Sea defense walls
Bridge decks
SURFACE PREPARATION
Jetties
Pontoons
In common with all surface treatments to concrete, the quality
of substrate preparation directly affects the performance
ADVANTAGES system. Surfaces to be treated must be free from dust, oil,
grease, paint, residual curing compound, mould oil or any
Provides total and permanent waterproofing properties by be- previous surface treatment that will impair adhesion of the
coming an integral part of the structure to which it is applied. MegaSeal treatment or inhibit penetration of the chemicals or
Active ingredients will not delaminate, peel off or wear away water into the surface. These include polymer modified renders
Protects concrete and reinforcement against corrosive water- and those substrates treated with silicon or silane water
borne substances repellents. Remove any laitance and provide an open pored,
slightly rough surface sufficient to act as a mechanical key,
Crystalline action is reactivated by contact with water providin essential for adequate adhesion of the MegaSeal treatment.
permanent and continuous protection Light sand / grit blasting of the concrete surface is the
Effective against both positive and negative water pressure preferred method of surface preparation.
Areas of weak or honeycombed concrete must be repaired.
Hollow, debonding renders must be removed and made good.
PACKAGING AND COLORS
Surfaces to be treated if not already wet, should
MegaSeal is supplied in 20 kg bags and available be saturated for a period of 24 hours before first applications.
in powder – grey.
Reliable
Innovative
MegaSeal® Solutions
Surface applied capillary waterproofing system for concrete and block work
MegaSeal system technology requires the presence of water When the mortar has set, complete the waterproofing,
for the active chemicals to migrate into the concrete. lapping slurry coats of MegaSeal onto the concrete
Crystalline development will usually extend to the depth of surrounding the hole. Holes under low pressure can be similarly
water penetration. sealed, but pipe insertion and MegaSeal 590 technical
datasheet prior to use.
Action
Moisture and free lime present in the substrate react with Specification clause
the active chemicals in MegaSeal to create a continuous MegaSeal System Crystalline
barrier of insoluble crystals. The crystal formation will
penetrate deep into the capillary structure of the concrete, Waterproofing
blocking capillaries and interstices from the passage of All areas indicated shall be waterproofed by the MegaSeal
water, whilst permitting the transmission of air and water system as manufactured by Master Builders Solutions or
vapour, enabling the structure to breathe. Rate and similar approved, to the following specification
penetration of crystalline development varies with the density
and surface absorption of the concrete, but the crystals will
penetrate to the depth to which water is present.
CURING
MegaSeal is equally effective against both negative and The MegaSeal must be prevented from drying out too
positive water or osmotic pressure and can be applied to rapidly and should be kept continuously damp for 5-7 days.
the internal or external surface. Wherever possible Mist spraying with water and covering with polythene is
however, MegaSeal should be applied to the surface with effective when drying out would otherwise take place.
which the water is in direct contact. This will result in an Curing compounds are unsuitable for use with MegaSeal
accelerated rate of penetration and crystallisation into the system technology.
concrete structure. After the After the crystallisation process
has successfully waterproofed the structure, the MegaSeal Protect from weathering, sun, frost and wind for a similar
active chemicals remain dormant in the concrete. Any later minimum period.
contact with water will reactivate the sealing process. Tanks and other water retaining structures may be filled 24
hours after final MegaSeal application as crystal growth is
accelerated by water pressure.
MIXING
CLEANING
Always add water to MegaSeal – not in reverse order.
Mix 1 part of water to 2.25 – 2.5 parts of MegaSeal Clean tools and equipment immediately after use. Use of
powder by volume. plastic or rubber containers is recommended.
Mix only sufficient MegaSeal that can be used in 20 minutes COVERAGE / YIELD
Two coat slurry application:
APPLICATION MegaSeal : 1 kg / m² / coat.
MegaSeal mixes are applied by brush or spray onto the Dry shake application:
dampened substrate. Apply the material in 2 coats at right UNMIXED MegaSeal : 1kg / m².
angles, the second coat whilst the first is firm, but ‘green’ –
usually 3-4 hours after first coat (dependant on temperature). HEALTH AND SAFETY
Plugging leaks As with all chemical products, care should be taken during
Leaks and holes drilled to relieve water pressure ma be use and storage to avoid contact with eyes, mouth, skin and
sealed permanently using MegaPlug. To plug leaks under foodstuffs. Treat splashes to eyes and skin immediately.
pressure, chase out the area of the leak until water flow is free If accidentally ingested, seek immediate medical attention.
and insert a length of plastic hose. Seal around the plastic Reseal containers after use.
hose with plugging compound as above. Clean the cavity with
mortar and allow to cure. When surrounding waterproofing is MegaSeal should be handled to minimize dust formation
complete, withdraw the hose and plug the hole with plugging during mixing. Use a light mask if excessive dust is
compound as above, using a gloved thumb to hold it in place unavoidable. For further information refer to the material
until set (approximately 1 minute). safety datasheet.
Reliable
Innovative
MegaSeal® Solutions
Surface applied capillary waterproofing system for concrete and block work
STATEMENT OF RESPONSIBILITY
STORAGE AND SHELF LIFE MBS_CC-UAE/Sl_501_12_94/v4/09_14/v5/10_19
The technical information and application advice given in this
product are based on the present state of our best scientific and
Store out of direct sunlight, clear of the ground on pallets
practical knowledge. As the information herein is of a general
protected from rainfall. Avoid excessive compaction.
nature, no assumption can be made as to a product's suitability for a
The shelf life is 12 months when stored as above.
particular use or application and no warranty as to its accuracy,
reliability or completeness either expressed or implied is given other
Failure to comply with the recommended storage conditions
than those required by law. The user is responsible for checking the
may result in premature deterioration of the product or
suitability of products for their intended use.
packaging.
