WATERSEAL PERMANENT WATERPROOFING
SYSTEM
DESCRIPTION
The BCR
Waterseal waterproofing system provides a solution to water leakage, ingress,
or seepage in concrete structures or any cementitious substrate. The formation
and development of insoluble crystals into water bearing capillaries and
interstices effectively blocks the further passage of water and ensures
permanent water tightness for the life of the structure. The BCR Waterseal
system is designed to function against water penetration in various conditions.
BCR Waterseal is supplied as a powder and when mixed with water, is applied
directly to concrete, blockwork masonry or cement renders in areas where
general waterproofing is required. BCR Waterseal is used in conjunction with
BCR Rapid Plug for instant leak plugging
AREAS OF USE
BCR Waterseal
can be applied to new or old structurally sound surfaces. It can be applied
either to the negative or the positive side and will negate dampness and ground
water permeation even under hydrostatic pressure.
BCR Waterseal
can be used for the following applications:
· Retaining
walls and columns in reservoirs.
· Swimming Pools
prior to tiling or painting.
· Concrete
drinking water tanks.
· Water
treatment and sewage plants.
· Foundation
slabs.
· Underground cellars,
basement car parks, garages etc.
· Pre-stressed
and pre-cast concrete units.
· Tunnels,
silos, irrigation channels.
· Bathrooms,
kitchens etc.
· Sand – cement
render.
· Lift shafts.
· Vehicle
maintenance pits.
ADVANTAGES
· Provides
excellent waterproofing properties by becoming an integral part of the
structure to which it is applied.
· Non toxic
· Non tainting
· Dual
crystalline and surface action
· Allows the
substrate to breath.
· The migratory
crystalline action is reactivated should future water contact occur.
· BCR Waterseal
becomes integral to the substrate thus eliminating potential wear,
de-lamination or
peeling.
APPLICATION
Preparation:
As with most coating
treatments, surface prep aration is critical and although this can be time
consuming it is essential that it be carried out thoroughly. BCR Waterseal is
only fully effective if the capillaries in the brickwork, concrete or technical
data sheetmortar are sufficiently absorbent to allow penetration of the
crystalline chemicals. All surfaces should be clean and free from paint
systems, oil, loose dust, shutter treatments, curing compounds, surface
hardeners and other contaminants. Surface preparation can be best carried out
using high pressure water jetting, grit blasting or mechanical scabbling. Water
jetting has the advantage that complete saturation of the substrate is achieved
but lack of drainage facilities may in some cases preclude its use. Large
cracks and other defects can be repaired using a 3:1 Sand : Cement mortar
gauged with BCR Compound SBR. Repaired areas can be coated with BCR Waterseal
after 24 hours but large areas of new brickwork, poured concrete or cement
renders should be allowed to cure for 3 days before application of BCR
Waterseal is considered..
BUILDING CHEMICAL RESEARCH LTD, UK
www.buildingchemicalresearch.co.uk
sales@buildingchemicalresearch.co.uk
Fillets:
It is recommended that sand :
cement fillets be formed at internal transitions between floors and walls (see
Diagram 1)
If it is impractical
to provide a fillet between floor and wall then a saw cut should be made in the
floor slab as close to the wall as possible and the subsequent application of
BCR Waterseal allowed to flow into the saw cut (see Diagram 2)
It must be
re-stressed that BCR Waterseal performs better on thoroughly dampened surfaces,
only then is its maximum penetration achieved. Dry surfaces should be saturated
with clean water, preferably 24 hours before application of the BCR Waterseal
and then re-wetted just before application.
Plugging;
In locations
where running water is evident this would suggest some degree of hydrostatic
pressure which must be relieved to present a satisfactory damp substrate onto
which the BCR Waterseal can be applied.
See Diagrams for procedures involved in
pressure relief and plugging.
Mixing:
It is important
not to mix more material than can be applied within 30 minutes at 20oC. The
recommended mixing ratio is approximately 2.5 to 3 parts BCR Waterseal to one
part clean water by volume. It is recommended that the powder is added slowly
to the water and mixed to a smooth lump free consistency .
N.B. If the mixed material becomes stiff do
not re-mix with water but discard and mix fresh material.
Placement:
The problems
which exist in the waterproofing of below ground areas are many and varied and
all cannot be solved with a simple specification - if in doubt contact the BCR
Technical Service Unit or your local BCR Distributor.
BUILDING CHEMICAL RESEARCH LTD, UK
www.buildingchemicalresearch.co.uk
sales@buildingchemicalresearch.co.uk
Normal problems
of damp and water ingress can normally be addressed by the application of two
coats of BCR Waterseal over the whole area. The second coat should be applied
at right angles to the first coat to ensure complete coverage is achieved. The
second coat may be applied as soon as the first becomes “touch dry”. In all
cases the second coat must be applied within 24 hours of the first. In hot dry
climates a fine water mist should be sprayed over the surface of the BCR
Waterseal before the second coat is applied .
It is critical
that all surfaces be treated with BCR Waterseal and it is essential that all
timber battens or fixings are removed before treatment commences. Provision for
re-fixing of battens etc, should be made in the wall prior to application of
the BCR Waterseal.
N.B. Masonry
affected by ground salts.
Although it is
important that crystalline ground salts which appear on the surface, should be
removed prior to coating with BCR Waterseal it is also possible that the
migratory action of the chemicals within product will aggravate the drawing of
ground salts to the surface. Where it is suspected that ground salts are
present, masonry should be treated with BCR Waterseal AS Fluid diluted with
equal parts water. The BCR Waterseal may be applied to the treated surface
after one hour
RUNNING WATER
This suggests
some degree of hydrostatic pressure which must be relieved to produce a
satisfactory damp surface to which BCR Waterseal can be applied.
BUILDING CHEMICAL RESEARCH LTD, UK
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Ventilation and
Curing:
De-humidifiers
should not be used immediately after application of the BCR Waterseal as this
would arrest the curing system. Moist conditions are desirable for a period of
at least three days, after which time de-humidifiers may be used to control
condensation. It is recommended that wherever possible ventilation is provided,
as lack of it may cause small condensation beads to form on the surface of the
BCR Waterseal.
Uniform
hardening and water tightness can be assured if the product is not allowed to
dry out to rapidly. Protect the coating against excessively fast evaporation in
hot conditions or drying winds. If these conditions prevail mist spray the
surface regularly.
Plastering or
Rendering:
Remedial plaster
systems may be used over BCR Waterseal provided an intermediate bonding
compound is employed. Dilute BCR Compound SBR with an equal volume of water and
apply to the cured BCR Waterseal and allow to become tacky, but not dry!
Plaster may then be applied as normal.
Decoration:
A period of at
least six months should be allowed before permanent decoration is considered.
During this period only use permeable emulsion paints
COVERAGE:
It is important
that no less than the minimum amount of product per square metre be applied and
it is essential that two coats are used.
By Brush 1 to
1.5 kilos per m2 per coat
By Trowel 2 to
2.5 kilos per m2 per coat
By Spray 1.5
kilos p er m2 per coat
N.B. In areas of
excessive water pressure the amount of BCR Waterseal should be increased to a
total of 6 kilo per m2 .
PACKAGING:
Available in 25
kilo paper sacks
PHYSICAL
PROPERTIES:
Nature: Cement
like powder
Colour: Grey or
White
Bulk Density:
1.25 kg/ litre
Application
Temperature :
> 5oC (Surface Temperature)
HEALTH AND
SAFETY:
Treat as Cement.
Protect eyes and skin from direct contact.
Freshly mixed
BCR Waterseal is alkaline and the use of suitable gloves and eye protection is
recommended.
Full Material Safety Datasheet is available
upon request
BUILDING CHEMICAL RESEARCH LTD, UK
www.buildingchemicalresearch.co.uk
sales@buildingchemicalresearch.co.uk
