For a class assignment we are designing a Sleepout. I'm finding it hard to find out the different foundations you can have underneath the house. My teacher brushed on the subject, and said you could have concrete, or wood. If so could you please describe them in more detail, and include some pros and cons. Also I am finding it hard to find different types of exterior doors, could you please describe them also and provides some pros or cons. If not then could you please direct me to a link that could give me that sort of information.
Thankyou very much