My basement ceiling is about 6'5" in hight and I will like to make it higher. Floor in a basement is cement slab so that is out of question to dig. What I had in mind was to add additional beams (2X6) to existing ceiling beams (2X8) and then trim 2" off of the old ones. That will give me additional 2". Is this possible to do or will this action compromise the structure of the house?