Re: House addition
There really isn't a problem with using the trench as a form. The footing, however, must be on undisturbed or properly compacted mineral soil (clay) and not on humus (decomposed matter). Placing on humus will result in settling.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.