The best method to waterproof a firewall?

Question:Hi. I manage a building that is 4 storey high and has a big firewall on one side of it. I am planning to have it waterproofed due to some seepage. I am wondering what is the best method for the long-term?

Answers:
CEMFLEX

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There's one way to do this but it would require quite a bit of work, but it's a sound (although unproven) way to get it done. Start collecting as much water as you can in containers. Seal them really well so no water can evaporate from them. Once you have collected all the water... You, nor anyone for that matter, will not have to worry about seepage ever again.

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