How-to-form-for-concrete-walls, when doing your own concrete work, knowing how to form a homemade concrete wall is an essential skill. if the form is constructed incorrectly, the concrete can "blow-out" the form, breaking it apart and creating an enormous mess while wasting much of your money.. How to build concrete forms and build a wall. the use of x series snap ties and conical snap ties at the same time, within the same concrete wall section. finishing a concrete wall under a house ..., the footings all concrete walls are supported on a poured footing. this is a concrete beam that is pour on solid ground. start by determining the size of footing you will need.