HydroCoat 104 is applied to the surface of concrete to provide in-depth protection against the movement of moisture through the capillaries and hairline cracks within the concrete. It consists of Portland cement, specially treated quartz sand and a compound of active chemicals. HydroCoat / HydroTank 104 is supplied in powdered form and is either sprinkled onto fresh concrete or is mixed with water as a carrier and brush or spray applied as slurry for application to fully cured or older concrete or vertical surfaces.

The active chemicals combine with the free lime and moisture present within the capillaries to form insoluble crystalline complexes which effectively block the capillaries and any minor shrinkage cracks to prevent any further movement of moisture to provide a totally dry surface to the concrete.

Large areas can be quickly treated with HydroCoat 104. The speed of application and the low material application rate (1 kg/m²) makes this product a very low-cost option for various scenarios.

Because HydroCoat / HydroTank 104 penetrates deep into the concrete, it does not leave a physical membrane to the surface of the concrete element and so is completely unaffected by loadings imposed by further elements of the build. New concrete elements are placed ‘concrete to concrete’ with no potential for slip or separation as is the case with physical membranes.

Surface preparation is required, as is protection after application - consult manufacturer for details.

Features and benefits:

Single component.
Ease of application – sprinkled onto new concrete and applied as a simple slurry to vertical and cured concrete.
Permeates deep into the concrete to form a barrier against moisture that cannot be damaged or punctured.
Loading capabilities only limited by the strength of the concrete.
No physical membrane – subsequent concrete placement is ‘concrete to concrete’.
Can be applied by airless spray for quicker application.
Concrete treated with HydroCoat / HydroTank 104 remains vapour permeable, allowing the structure to breathe.
Easy to detail and specify as the concrete surface becomes the membrane.
HydroCoat / HydroTank 104 requires controlled curing. Once the HydroCoat / HydroTank 104 begins to cure, moisten with a fine fog spray of water 2–3 times a day for three days. In hot or windy conditions, water spray should be applied more frequently.
Cost-effective alternative to conventional physical membranes.

Curing:

To be kept rain-free: For 3 hours (at all temperatures).
Ready for temporary traffic/ protection boards: After 3 hours (at all temperatures).
Initial set: At 5°C: After 6 hours; at 10°C: After 4 hours; at 15°C: After 2 hours; at 20°C: After 1 hour; at 25°C: After 45 minutes.
Fully cured: After 28 days.