Foundation On Bedrock Video
There is solid bedrock at the bottom of the hole. They used a machine that blasted through the rock like a giant jackhammer. They dug the hole a little lower then they needed and here’s what they did.
The footer they poured is about 10-inches high. It looks like it is poured on a very thin layer of sand. However, this is really a layer of coarse rock, about 2-inches in diameter and very angular. This was compacted and leveled to provide a flat surface to pour the footer. The footer is not poured directly on to bedrock. The bedrock would be to irregular for the footer.
This is one way to prepare the foundation hole to pour the footer on top of bedrock.
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Hi Tim,
Thank you for sharing your knowledge. I have a question for you. In case where the bedrock (hard basalt rock) is exposed all the way to the surface, that is very little to no top soil on the bed rock, how can one build a foundation on such surface?
The house I wish to construct is using the same basalt rock that was dug out during a dam construction from a near by property.
Look forward to hearing from you.
Kind regards,
Eric
Simple. Place your dam basalt rock on top of the bedrock.
Problem solved. Look at the Great Wall of China for inspiration. The rocks for that wall were placed on bedrock in almost all locations along the wall. You can also look at the photos here to see how Mr. Rockefeller built his magnificent stone bridges on top of bedrock:
https://www.askthebuilder.com/long-lasting-concrete/