I am a masonry guy, so this is a little out of my league, but my wife insists, so I have to do it. Situation: The garage/utility room was converted into a library. A few walls were moved, a section of the floor was raised (from the garage level to the main house level, 6), and the old utility area was converted into a small (8x14) second kitchen for the previous owners catering business. I have located all of the old plumbing/electrical hookups, but I can not find the dryer vent on the exterior. They either did a great job of patching the rock exterior, or it vented through the roof, which I won't do. My questions: I can run the dryer vent under the raised floor section, and then out the side of the house through the new waterheater closet (about a 15' run). What should I use for that vent, hard pipe or flex? I want to move several light switches and a couple of electrical boxes, should I go ahead and rip out the sheet rock, since the walls are covered with crap wallpaper anyway? I will probably be doing some stucco and cultured stone for most of the walls, but my sheetrock skills are nil, and some will have to taped and floated. Thanks in advance.