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First find out whats under your current flooring, wood or concrete, how level is it??? To have a good looking job with hard wood there should be no more than 1/4 inch variance in 4 feet, that rarely happens unless your home was built with engineered floor joists. If your wood floor is made of 3/4 inch plywood, you dont need underlayment for hardwood. Just fill in the low spots, usually between the joists, with self-leveling filler available at most home stores. You can glue or nail hardwood thats between 1/4 & 3/8"(prefinished) but the 3/4" unfinished variety has to be nailed. I recommend the prefinished type, no sanding or finishing needed. Just remember the finished floor is only as good as what you go over, so check for squeaks first, get the subfloor as level as possible, and make sure its solid. Go over the plywood with wood screws, on the joists of course, they wont back out over time.
In your garage you have the right idea, but you may want to stand the 2x4's upright if you plan on running ductwork in there. Fill the voids between the 2x4's with styrofoam insulation, and you'll have a warm cozy floor. Liquid nail and screw 3/4" plywood to the 2x4's, then install your hard wood. Good Luck, you might want to call a pro, this is not something for the average do it yourselfer, but if you have some construction skills and common sense its possible.
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Syriana...have you ever tried liquid MDMA?....Liquid MDMA? No....Arash, when you wanna do this?.....After prayer...
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