We’ve presented some techniques for building interior walls but overwhelmingly the material of choice is now metal/steel studs. Besides saving trees, metal studs have many advantages over traditional lumber. They don’t shrink or split and are always perfectly straight. They’re also light and easy to store; they resist fire, insects and rot; and they are about 30% cheaper then wood. Plus you’ll only need tin snips and a screw gun or a drill with a bit-holder. But remember, metal stud walls should only be considered for non-load bearing use.