DPC is damp proof course to prevent water getting into the interior of the building. Vertical allows the water to pass up or down while horizontal allows it to pass left or right.
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Horizontal is X-Axis and Vertical is Y-Axis.
An antonym for the word 'vertical' is 'horizontal'
Vertical.
A vertical line goes North And South and a horizontal line goes East And West.
Rows are always horizontal, and columns are vertical. It's easier to remember when you think of rows of seats (like in a sports stadium) which are horizontal, and buildings have tall columns, which are vertical.