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Prevent Rising Damp Liquid Membrane:


ARDEX WPM368 - Single Part Barrier Membrane  

Water resistant, prevents rising damp, substrate efflorescence and withstands hydrostatic pressure. Leading edge innovative technology for liquid applied membranes. Excellent adhesion to most substrates including damp surfaces and freshly laid green concrete. Built in mechanical key, sand blinding not required Suitable for under tiles and under floor levelers. Suitable as an incontinence barrier to concrete floors prior to carpet and carpet tile installation.  

Description  

ARDEX WPM 368 is a single component acrylic copolymer membrane that will prevent rising damp, efflorescence and will resist negative hydrostatic pressure when used in accordance with the technical data sheet. It has excellent adhesion to most substrates including brick, masonry, concrete block, concrete, stone and is simple to use by brush, roller or airless spray machine. ARDEX WPM 368 single part damp-proof is safe to use and can be over-coated using almost any decorative paint. ARDEX WPM 368 can be applied to damp surfaces and freshly laid hardened (green) concrete and conforms to the Building Code of Australia as a waterproof membrane.  

Features/Benefits    

  • Non-flammable and negligible odour.
  • Can be applied to damp surfaces.
  • Can be safely applied to freshly laid hardened (green) concrete.
  • When applied directly to the substrate (dual coat system) the cured membrane will withstand 250kPa of hydrostatic pressure which is equivalent to a 25 metre head of water.
  • Can be over coated using almost any decorative or industrial finishing paint. Prevents rising damp and the formation of efflorescence when used as a dual coat system.   

Typical Application

As a low water vapour transmission coating in the building and construction industries and as a barrier/seal coating over freshly laid or damp concrete. As a hydrostatic pressure resistant waterproofing membrane to prevent water seepage or dampness penetration through to the interior of walls and floors. As a waterproofing barrier on the negative side in below grade surfaces such as basements, tunnels, lift wells, retaining walls and carparks. As a waterproofing membrane or barrier coating over freshly laid hardened (green) concrete, prior to the application of conventional levelling compounds, carpet and tile adhesives.

As a barrier seal coating over damp, green or efflorescence producing concrete prior to over coating with conventional building paints. For use as a waterproof barrier prior to applying ARDEX floor levellers and tile adhesives.  

Basic Application Instructions  

Surface preparation  

All surfaces to be treated must be structurally sound; and existing coatings, adhesives, efflorescence should be removed to achieve maximum bond strength and resistance to hydrostatic pressure. Surfaces must be cleaned free of dirt, grease, oil, or other surface contaminants. Holes, non-structural cracks or other surface deformities should be filled with ARDEX WPM 405 (Sheltercrete Additive), sand/cement mortar, or ARDEX concrete repair systems and allowed to cure for 2 - 3 hours before coating is applied.  

Installation  

Floors - Apply the material using a roller or spray to achieve coverage and finish using a long nap roller.  

Walls - Apply the product by roller or spray taking care to achieve required coverage. When the product is to be applied to dry concrete it is advisable to wet the surface with a fine mist of water before application and allow to just surface dry.  

Care must be taken to work the material into the surface to fill voids and avoid pinholing, a minimum of one coat for reducing efflorescence and two coats required for rising damp, waterproofing and waterproofing negative side walls. Care should be taken to ensure uniformity of material and the required coverage is achieved. It is necessary to lay the material onto the surface and lightly finish achieving the required dry film thickness per coat.  

Tiling Applications  

Substrates such as screeds and renders should be normally allowed to dry for 7 days prior to the fixing of ceramic tiles. Alternatively ARDEX WPM 368 can be applied in one coat by brush or roller application at a coverage rate of 3m2/L or

a WFT of 0.3mm per coat. Broadcast sand is not required.  

Flooring Application  

Where concrete subfloors are damp (moisture content exceeds 5.5% or have a relative humidity of above 70%) ARDEX WPM 368 can be applied as a moisture barrier. Two coats are applied at 3m2/L or a WFT of 0.3mm per coat. A single coat of ARDEX WPM 368 applied at 3m2/L per coat acts as a moisture stop for green concrete not subject to rising damp or permanent moisture. Broadcast sand is not required.  

Limitations  

Tiling can commence after 24 hours cure of ARDEX WPM 368 although should not exceed a maximum of five days. Installer is to ensure that there is no surface contamination or membrane puncture during this period. If left exposed for longer than five days or contamination has occurred, clean with a damp cloth and apply another coat of ARDEX WPM 368. The product should be applied whilst the surface temperature is between 10-35oC. The product will cease to cure below 10oC. Curing time will also be adversely affected in situations where relative humidity is >85%. ARDEX WPM 368 is not classified as a trafficable or UV stable membrane. It is not suited for potable water applications.  

Coverage  

One coat of ARDEX WPM 368 is required to reduce efflorescence or as a moisture resistant coating over green concrete. The coverage rate should be 3m2/L, or a WFT of 0.3mm per coat. In areas that are affected by hydrostatic pressure, two coats are applied at 3m2/L or a WFT of 0.3mm per coat. In the event that this coverage rate is not achieved in 2 coats, further coats should be applied to achieve a uniform coverage rate of 3m2/L. Recoat time is 2-4 hours depending on ambient temperatures.

Drying Time  

Allow ARDEX WPM 368 to cure for 24 hours before applying adhesives, mortars, decorative coatings or other surface treatments. Care is necessary to ensure the waterproofing membrane is not damaged during subsequent treatments.  

Packaging/Shelf life

ARDEX WPM 368 comes in 20kg pail. Shelf life is 12 months when stored in the original unopened packaging, in a dry place at 23oC. Do not store in direct sunlight. Replace lid tightly after use. Use remaining contents from part used containers within one month.  

Safety Precautions

Wear gloves when working, if the product enters the eyes, wash with clean water for at least 15 minutes and seek medical advice. If swallowed do not induce vomiting, give glass of water and contact a doctor.  

Thinning and Cleaning up  

Wash all equipment in water or water/detergent immediately on completion.    

TECHNICAL PERFORMANCE DATA

 

Colour

Grey

Finish

Semi-gloss going to matt with aging

Volume solids

50%

Coverage

 

Must be applied at a rate of 3m2/L, or a WFT of 0.3mm per coat to achieve an effective waterproofing membrane (two coats total)

W.F.T.

300 micrometers (0.3mm) per coat

Recoat time

2-4 hours @ 25oC and 50% R.H.

Full cure

7 days @ 25oC and 50% R.H.

 

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