Turndown Footing Technique, No Frost Depth worries!!
Turndown Footing Technique, No Frost Depth worries!!
(OP)
Has anyone heard of turndown footing system used in the Northeast that utilizes non-frost susceptible fill? Supposedly this is being used to reduce the turndown depth.
In a nutshell, rock is placed beneath the turndown, and the rationale is that the rock wont frost heave. I'm not so sure I buy into it, especially if there isnt a fully functional drainage system in place.
In a nutshell, rock is placed beneath the turndown, and the rationale is that the rock wont frost heave. I'm not so sure I buy into it, especially if there isnt a fully functional drainage system in place.






RE: Turndown Footing Technique, No Frost Depth worries!!
RE: Turndown Footing Technique, No Frost Depth worries!!
thread256-188342: Gravel or Sand Below a Foundation
RE: Turndown Footing Technique, No Frost Depth worries!!
RE: Turndown Footing Technique, No Frost Depth worries!!
http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd182_e.html
RE: Turndown Footing Technique, No Frost Depth worries!!
RE: Turndown Footing Technique, No Frost Depth worries!!
RE: Turndown Footing Technique, No Frost Depth worries!!
RE: Turndown Footing Technique, No Frost Depth worries!!
Proper Geotechnical Report to define the site - See BigH above.
Proper definition of shallow subsurface and surface water control - See BigH above.
Million dollar homes in resort areas of Colorado done this way, in total or in part.
RE: Turndown Footing Technique, No Frost Depth worries!!
The OP wasn't asking about insulated foundations though. I've used shallow downturned slabs under transformers and outdoor mechanical equipment. Put gravel down to +20% below frost depth. Read here somewhere that placing a gravel fill increases frost beyond normal depths. My thinking is that the gravel may fill with water, freeze, and lift the pad a small amount. But it won't heave inches. I make sure that the equipment has flexible connections so a small amount of lift won't break anything.
RE: Turndown Footing Technique, No Frost Depth worries!!
I will be the EOR for your project for a modest fee if my details are incorporated.
RE: Turndown Footing Technique, No Frost Depth worries!!
"because it worked in other places" isn't necessarily a valid argument in court and allows you to get sucked into errors caused by the contractor.
RE: Turndown Footing Technique, No Frost Depth worries!!