Do you have property upon which you’re trying to build a cottage? Does a large portion of the land happen to be bedrock? If so, you might be interested in how I answer the following homeowner’s question:

Q: What recommendations can you offer for the foundation of a seasonal, water-access cottage we’re building directly on bedrock? I plan to follow your idea of using foam forms to contain the concrete as it surrounds a crawlspace, but I wonder about water drainage between the rock and foundation wall. Do I need to do something to allow water movement? How should we keep the foundation protected from frost over winter?