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Hi,

I would like to build an outside stair that goes down around 15 feet, but the area is a solid rock, i have soil covering that ranges from 6 to 24 inches. Each time i try to install a 4 feet pile, i hit the rock. Is there any suggestions how to install the stairs on rocks ?
 

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Is your stairs going to lay totally in the dirt or just the end of the stairs resting on dirt?
 

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You plan the staircase and where it will hit the ground. You provide the landing by engineering a level pad. Maybe it's 4 sonotubes down to bedrock with an integrated pad formed on the ground. The sonotube lengths might vary, but stable is stable.
 
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