- 1). Examine the splash block. It will have one open end and one closed end; the open end must face away from the house. Installing it backward will direct water back against the building.
- 2). Evaluate the slope of the ground around the downspout. The splash block should be pointed in a direction that leads to a slope leading away from the home. If the water comes off of the splash block onto a slope angling toward the house, it could also lead to flooding.
- 3). Scrape the area underneath the block roughly flat using a shovel. Dig down a little at the far end to give the block a bit more slope if necessary (splash blocks have some slope built into them).
- 4). Set the splash block into the spot you've prepared, with its back end 2 or 3 inches behind the back of the downspout, so that it catches as much of the water as possible.
- 5). Repeat the installation process for all other downspouts that need a splash block.
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