I boarded up 27 windows on a frame house for a Cat 3 in 2004...my 12v cordless drill died, and Phillips style screws were a pain to start while single handed holding the plywood....I've upgraded to a good 18v (Ridgid) drill and T21 or T25 TorX exterior coated screws for the next go around...a Stanley Yankee Screwdriver in case both batteries for the Ridgid don't make it