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

www.buildingchemicalresearch.co.uk

sales@buildingchemicalresearch.co.uk

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