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Do I need a dry well for this foundation?

 
pollinator
Posts: 1566
Location: Denver, CO
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I am starting to build a small greenhouse with a rubble trench foundation. It will go six inches below frost depth, and be surrounded by ridged insulation. This is in the dry climate of Denver. Will I need to install drain pipe to a dry well? Or is this unnecessary? I am finding conflicting information on line.
 
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This is in the dry climate of Denver. Will I need to install drain pipe to a dry well? Or is this unnecessary? I am finding conflicting information online.



No..and...No...and...Yes, there is a great deal of conflicting information, often coming from sources that either want to sell you something different than you plan on doing, or to steer you toward methods of construction they understand better (or profit from more) than what you want to do...

With that said, dry wells are usually only for poorly draining soils, areas with high precipitation levels, and/or geographic location that would facilitate the gathering/pooling of precipitate. It is not even clear at all that you need to go below the "alleged frost lines." "Frost heave" is very much a misused, miss define, and poorly understood element of design and construction, and stems as much from "habit" as it does from actual necessity. I weekly evaluate, move, and examine vintage timber frame architecture (mainly barns) that "just sit on plinth stones" that have been set on the mineral soils of the building.

The presence of bentonite clays are more of a concern than frozen/freezing earth, and frost heave.

If you would like to read further...look at some of the other information I have shared here at Permies on foundations, construction, and the related...

Good luck,
j

 
Posts: 9002
Location: Victoria British Columbia-Canada
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Listen to J. Be sure to build the stone high enough to keep the wooden portions from absorbing water from beneath. Often, things get built and then soil gets piled against the building for flower beds and such. This soil could then wash down and fill the spaces between the rubble. Slush, from melting snow can saturate wood work. --- High and dry. Low and wet. A simple choice.
 
Posts: 554
Location: Asheville NC
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And dont forget the power of an uphill swale.
 
Dale Hodgins
Posts: 9002
Location: Victoria British Columbia-Canada
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Around here, water usually doesn't need to be stored. An uphill berm set on an angle to divert the water so that it misses the building, is pretty simple. Soil from the excavation creates the berm.
 
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