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What is the best method for damp proofing anhydrite screeds?

With UZIN PE 425.

The industry has seen a growth in the use of anhydrite screeds (also known as calcium sulphate or gypsum screeds) but there has always been a problem with adequately protecting against residual moisture, especially if the relative humidity is above 85%. UZIN has developed a solution for damp proofing anhydrite screeds for residual moisture up to 95% RH. With UZIN PE 425 projects can be expedited without the long delays previously caused by damp anhydrite screeds.

Step by step guide:

The substrate must be dry, free from cracks, clean, free from materials, which would impair adhesion. Use a grinding machine to remove all surface laitance and expose the screed aggregate. Remove any dirt or dust from the calcium sulphate screed with an industrial vacuum cleaner.
Mix parts A & B of UZIN PE 425 together. Then add 10% of water and mix again. Then apply onto the substrate using a UZIN Nylon Fibre Roller until the calcium sulphate screed is saturated. Allow to dry for 1 to 2 hours. Then apply a second coat onto the substrate. Allow to dry for at least 12 to 48 hours.
Apply a coat of UZIN PE 404 resin DPM onto the substrate using the UZIN Nylon Fibre Roller, ensuring the whole surface is completely covered. Allow to dry for approximately 1 hour*. Once dry apply a second coat and allow to dry for another hour*.
Use a UZIN Nylon Fibre Roller to apply a thin coat of UZIN PE 280 primer and allow to dry for approximately 45 minutes.
Once dry apply a smoothing compound such as UZIN NC 110. Mix the sack contents with approx. 5.5 litres of water until smooth and lump free. Spread UZIN NC 110 onto the substrate using a UZIN Screed Rake or Screed Trowel. Remove any air using a spike roller and allow to dry. UZIN NC 110 is ready for foot traffic after 2 - 3 hours and ready to receive the floor covering after approximately 20 hours*.
Choose a suitable adhesive for installing the floor covering such as UZIN KE 66 for vinyl, rubber or luxury vinyl tiles. Apply evenly onto the substrate using a suitable notched trowel. Install the covering, rub down over the whole area and after approximately 20 minutes, rub down again or roll.

*Under normal conditions at 20°C and 65% relative humidity. See product data sheets for more information.

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