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When can water penetrate a wall? Three conditions are necessary. Firstly, there must be water present at the outer face of the wall. Secondly, there must be a crack or a hole in the wall through which the water can move. And thirdly, there must be a force that will move the water through this opening. If any of these conditions is absent, water will not penetrate a wall.
In what way can one keep water away from the walls of a building? One can eliminate all the openings from the wall in order to make a wall watertight.
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One can eliminate all the openings from the wall in order …
to penetrate a wall
to build a wall
to move the water
to make a wall watertight