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Install the tanking membrane according to manufacturer's instructions.
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Lay the drainage system.
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Install PERIMATE™ DI-A insulation against the tanking membrane, with the grooved face outward and running vertically, using a suitable adhesive such as INSTA-STIK™ from Dow Building Solutions.
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Backfill to the designated level.
Key points
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ensure boards butt together tightly
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when installing more than one row of boards ensure the filter fabric on upper rows laps over that of lower rows.