My understanding is that for an LLC to provide protection the house would have to be used for purely business purposes and that there can be no co-mingling of p

My understanding is that for an LLC to provide protection the house would have to be used for purely business purposes and that there can be no co-mingling of personal finances. the concept is called "piercing the corporate veil". IANAL but I looked into this pretty extensively when choosing how to protect myself with investment properties.