Dale Walker wrote:Some good info this doc:
I know it deals with more "conventional" materials... but may provide some good insights.
Hans Quistorff wrote:Remember frost heave comes from the expansion of water freezing. if it is dry it will not heave. So as you pry and dig consider whether water will get under the foundation and your plan to prevent it.
The worst frost heave I ever saw was on the military road south of Fort Kent Main which had a spring under it and it was kept plowed at all times. ye nearby were houses built on ledge rock close to the surface that never moved.
Mark Clipsham wrote:It may not seem green but in this case a little bit of 2" rigid insulation goes a long way especially since you only have one face to protect - theoretically. We do FPFs a lot with my grain bin designs - also with the evil petroleum based pour foam - it is THE best product for this - we're not using gas in our Hummer to cruise the mall but to get the best building with the highest performance for the least labor which saves the most energy. I've done some "digging" such as you describe in Arkansas/lower Missouri - what a lesson in frustration. Maybe put an oversized overhang on your roof to get the water away from the foundation and a swale uphill to divert the water. In Kansas I have seen barrel vault cellars (storm/root) made of limestone - truly magical spaces especially in a hot summer. This is a labor of love - get started and do a little - do a little more - decide when you've had enough - think of it as therapy. You will get to the desired depth without the need for any band aides. You could use a section of a bulk bin as your vault and lay your stone on top of that (would recommend mortar if the stones are not a good shape for laying up) and then cover with your excavation material - it should be there for a long time. If you use the bulk bin for your form load it evenly from both sides and some bracing is a very good idea or it will become your final resting place. Be careful. You could build the vault with the bag method - see Dream Green Homes. Best wishes.