I have seen pictureson the public forums using a demolition hammer to pound rebar. But I have seen more pictures of good old-fashioned sledgehammers being used. Since I plan on building a 12x12 building my logs will not be huge. Which is more prevalent or makes most sense for my situation. If demo-hammer is used what is used to strike the rebar so that you do not glance off the rebar into something softer like my shin.