DEEP BARRIER is a non-membrane forming moisture barrier compound that works in the concrete slab and not on the concrete surface.
Water based, ready to apply blueish liquid.
Why a moisture barrier for concrete?
At the time of pour, a cubic metre of concrete typically has 190-195 litres of water. Over the next 28 days during the process of hydration some 120 litres leaves the concrete. As the water tracks out it leaves porosity or capillaries through the thickness of the concrete where any moisture present can move in or out.
A common myth is that concrete is dry as soon as it can be walked on.
In fact to conform to the Australian standard (AS 1884-2012), concrete must have a reading of no greater than 75% relative humidity and a moisture content of less than 5.5%.
In normal conditions an average slab of 100mm thick can take 4-5 months of drying time before it will conform to that standard. This is approx 20-25mm thickness of concrete per month
And even when the concrete conforms to the Australian Standard, if there is water present the concrete will still act like a sponge and continue to absorb water, causing the same problems.
Testing for excess moisture:
85% of flooring failures are due to the presence of moisture in concrete from hydro-static pressure or green concrete.
The majority of floors are never tested for moisture levels. With the correct equipment it is a very simple and easy test to do. Not testing.
- Wastes valuable time and money having to re-do jobs and repairs
- Annoys the customer, wasting their time and money sorting out the floor problems
Once a floor has been installed any moisture present will be drawn to the surface. If there is no way of escape for the moisture it will react with any adhesives or coatings on the surface of the concrete.
How to prevent moisture problems:
Waiting for the concrete to dry is not an option. This means you will have to use a waterproofing agent so you can get on with the job and to prevent any potential moisture problems.
The two main methods are either a membrane on the top surface of the slab (the traditional method) or to use an internal penetrating barrier.
- Membrane forming moisture barriers – are sprayed on to the concrete surface forming an impermeable skin. These compounds are applied generally 28 days after pour, done in 2 coats with a 12 hour wait in between. Then you have to wait another 12 hours before you can lay any flooring. They can be very easily damaged during the construction process, and rely on the skill of the applicator to ensure that there are no pin holes left where moisture can escape.
- Penetrating or internal moisture barrier – these compounds do not form a membrane but penetrate the concrete surface, react with the cement powder and turn to a gel, blocking the movement of moisture out of the slab. They also cure, harden / densify the slab, and help prevent efflorescence. They do not slow down the construction program as with the other type of barrier. We had one job where the 200mm thick slab was poured and within 14 days the flooring contractor was laying sheet vinyl.
DEEP BARRIER ‘ticks’ all the boxes for being a fast, cost effective solution when you need a moisture barrier for concrete.
Here is how easy application is:
Stiff bristle broom
Knapsack / back pack sprayer
Typical use areas:
- Concrete footings and pavements
- Precast concrete elements
- Balconies, roads and runways
- Buildings, bridges and infrastructure
- Safe and easy and fast application
- Can be walked on within 15-30 minutes
- Cannot be damaged during the construction process
- Assists in the prevention of efflorescence and concrete cancer
- Enviro-friendly, odourless, non-toxic and waterbased
- Assists in the adhesion of coatings and adhesives
- Improves chemical resistance
- Prevents moss and mildew growth
- Vehicle Type: Water based
- Viscosity: 2.4
- Specific Gravity: 1.1
- Drying time: 30 minutes @ 25ºC
- Finish: No change to substrate
- Colour: Blue tint – dries clear
- Theoretical Coverage: 4.0 – 4.5m²/litre
- Freezing point: -20C
- Boiling Point: 1000C
- Abrasion Resistance: Excellent
- Bacterial Resistance: Excellent
- Chemical Resistance: Excellent
- Heat Resistance: Up to 1200C (dry heat)
- Solvent Resistance: Good
- Salt Spray Resistance: Good
- Thinning and cleaning: Water
- Durability: Excellent
- VOC Content: None
- Surface Bond: Excellent
- Equipment: Non Atomizing Spray e.g. Use knapsack or backpack, airless spray or us a coarse bristle broom.
- Cleaning: Water.
- Typical Specification: One coat, however if applied over a very old/porous concrete 2 applications may be required due to the porosity.