Crystoseal is a ready-for-use (merely add water)
concentrated, high strength, cement-based waterproofing
slurry incorporating active chemical constituents which, when applied,
become active in cementitious substrates and by a
a waterproof seal within the substrate. Crystoseal waterproofs sound
concrete or cement surfaces against water ingress, dampness, ground water and
hydrostatic pressure. Crystoseal is suitable for waterproofing both the
positive and negative sides of the substrate.
It consists of a blend of cements, graded quartz and active chemical
constituents and gives a render-like appearance. Crystoseal works by the
conversion of free lime in the concrete to insoluble calcium compounds. These
seal against capillary ingress of water. Compounds within
Crystoseal penetrate in to the substrate where they in turn 'crystallise'
on contact with moisture and create a waterproof barrier.
Crystoseal is an economical, easily applied method of
providing a waterproof barrier to sound and stable concrete or cement
based products such a cement filled block work. It may be used on both new and
existing structures. Crystoseal finds particular use on concrete structures
where access is only available to negative side of the structure such as
the internal side of retaining walls.
Crystoseal finds applications in concrete or cementitious
substrates such as:
Foundations, basements, tunnels,
retaining walls, water retaining structures, ponds, pools, silos and
The information contained in this product data sheet is
typical but does not constitute a full specification as conditions and specific
requirements may vary from project to project. The instructions should be
considered as a minimum requirement but the applicator or contractor must use
their skill, knowledge and experience to carry out additional works as may be
necessary to meet the requirements of the project. Specification for specific
projects should be sought from the Company in writing.
Crystoseal is formulated for concrete and
cementitious substrates only which must contain high levels of concrete or
cement. Crystoseal acts within the tissue of the substrate and is dependent
upon its soundness. If the substrate cracks, then the Crystoseal will
crack in sympathy and it will not seal or bridge cracks. Cracks and joins must
be independently waterproofed by alternate means before applying Crystoseal.
Crystoseal relies on the soundness and
density of the substrate. If the substrate contains internal or external voids
or is honeycombed then the effectiveness of the product may be negated or
diminished. It is highly recommended that block work be filled and compacted.
Crystoseal must not be exposed to water
pressure, running water or rain until it has set.
Crystoseal is not a vapour barrier.
When sealing the negative side of a structure,
if there is hydrostatic pressure or a build up of water on the other side of
the structure, there is a risk that water will find other areas of penetration.
Since the Crystoseal system is
based on a chemical reaction taking place inside the concrete, some moisture
penetration can be expected until voids are sealed by the crystallisation
process which can take some time.
Crystoseal is dependent upon the
application of sufficient product to effectively convert the free lime in the
Benefits and Advantages
Crystoseal has application where conventional membranes
would be unsuitable such as:
On damp cementitious surfaces.
There is only access to the
negative side of the structure, i.e. inside surface of a retaining wall or
outside of water retaining structures.
Easy to use. Simply add water, mix and
apply by brush or roller.
Precautions in Use
Crystoseal must not be exposed to water pressure, running
water or rain, until it has fully set. The treated surface must be protected
from heat and wind and drying should be as slow as possible.
Note: Since the Crystoseal system is based on a chemical reaction
taking place inside the concrete, some moisture penetration can be expected
until voids are sealed by the
process. Refer to Limitations
Priming and Surface Preparation
Good preparation is essential. Surfaces must be sound,
stable, dry, clean and free of dust, loose, flaking, friable material and
substances that may diminish adhesion.
Crystoseal is designed for use on porous, concrete
or cementitious surfaces.
All surfaces must be clean, sound, free of laitance, form work release agents,
paint, coatings, dust, loose particles and any other foreign matter including
fungal growth. Crystoseal must be applied directly to the clean concrete
Large cracks and honeycombing should be made good with thin coating of
Crystoseal mixed as described below and then be filled with a non-shrink
mortar prior to applying the overall Crystoseal treatment.
A fillet should be formed using Crystoseal in a slightly stiffer version in all
floor/wall joints prior to applying the Crystoseal in the specified manner.
Crystoseal only needs the addition of water to be ready for use.
Mix Crystoseal with water to produce a viscous, creamy consistency (1 part
clean water to approximately 2.5 parts Crystoseal). Mixing may be done by hand
or mechanical mixer and should be continued until a homogenous, lump free
product results. In manual mixing lumps may be broken down with a gloved hand.
On completion of mixing, material must be used within 30 minutes.
Never attempt to reconstitute the mixed product by further dilution after mixed
material has become too stiff to apply. Discard this product.
Any surface to be treated with Crystoseal must be fully
saturated with water beforehand, preferably the day before. Surfaces such as
floors must be free of ponded water or running water and verticals must be
free of water running down the face. Apply Crystoseal using either a
medium-hard block brush, trowel, broom or roller.
Treatment must be applied in a minimum of two or three coats as indicated
below. A second coat must be applied as soon as the first coat can no longer be
disturbed by brushing. If a third coat is required it must follow within 24
hours, with the surface having again been pre-dampened.
The final coat of a system, be it two or three coats, must be left as smooth as
IMPORTANT: The applied Crystoseal must be protected from heat and wind
and drying should be as slow as possible. Do not let the surface dry quickly
and can be sprayed with water to dampen it.
Do not attempt to reconstitute the mixed product after it has become too stiff
to apply by adding water. This product should be discarded.
The stated average coverage rate may vary depending upon
type, condition, porosity, texture of the surface and application technique.
For waterproofing external surfaces against water
ingress from damp earth and mist ground apply a minimum of two coats
applied at 1kg to 2 kg per m2 per coat.
Waterproofing internal surfaces
against rising damp up to 1m head of water apply a minimum two coats applied at
2kg to 4kg per m2 per coat.
Waterproofing water retaining
structures internally apply a minimum two coats applied at 2kg to 3kg m2 per coat.
Waterproofing externally against
more than 1m head of water pressure apply a minimum of 3 coats applied at 2.5kg
per m2 per coat.
Crystoseal has a 'cement' colour and gives a
Drying and Curing
Drying and curing of the product is affected by type,
dryness and porosity of the surface, temperature, humidity, ventilation,
climate conditions and application technique and therefore drying and curing
can only be given as a guide.
For best results drying should be as slow as practically
possible. Post dampening is an advantage.
Stores in dry, cool areas. Damaged bags or material that
is water or moisture effected should not be used. Available in 20 kg bags.
Water, as for cement.
Tiling, Topping or Top Coating
Generally Crystoseal is not topped.
If area is to be topped, then adequate time should be given to ascertain that
the desired effect has been achieved and then should be membraned by
priming with Duram Primeseal followed by the application of
the selected Duram waterproofing membrane such as Durabit EF, Durabit REO,
Multithane, Duram 195 or Crystoflex.
If area is to be painted, then adequate time should be given to ascertain that
the desired effect has been achieved and then primed with Duram
Primeseal and then painted.