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Building Homes or Extensions/Working with (auguring through) aggregate

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Expert: Ted Barnhill (Principal, Design45 LLC) - 8/20/2007


Question
I am going to build a deck to my new modular home.  One spot requires me to drop a Sono Tube to a depth of 4 feet but I have to go through about three feet of crushed stone (aggregate) about 1" in size.  What is the best way to get through the aggregate without it caving in?  Or can I just pour concrete on top of the aggregate?


Answer
That is a lot of aggregate.  What is it for?  If it is backfill adjacent to a foundation, why not put a deck ledger onto the home instead of posts?  Depending on the loading of the deck (size, height, covering, etc.) it might be inadvisable to put new loading right next to your home, where the soil will push laterally on your foundation.  If the aggregate is for some other load bearing purpose, you might be able to just pour on top of it if it is compacted, though since the aggregate isn't down to the frost line (4' I assume from your comments) there is a chance of it heaving.  Good luck.

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Ted Barnhill (Principal, Design45 LLC)

Expertise

I can answer questions about architectural design, how to work with a designer, and best construction practices for most trades. I specialize in cold-climate design (I'm in Minnesota), older home renovation, and energy-efficient/sustainable design.

Experience

As a Principal of Design45, I design and detail new homes and remodels. I am formally trained in architecture, but have also been a contractor and have experience with many trades. I strive to provide beautiful, durable, and efficient homes for clients and communities of all types and budgets.

Education/Credentials
Undergraduate work at Princeton University (Mathematics), Master's work at the University of Minnesota (Architecture)

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