Re: drywall unsquare rooms
Before hanging any drywall, before installing a single new piece of framing lumber, you would be wise to make the floor as level as possible. You might find that many walls magically become square, level, and plumb. Once the first floor is leveled, you might be able to do some leveling and shimming of the second floor, too.
Many old houses were originally built square, but on inadequate footings. Over time, those footings settle into the soil, leaving the house unsquare and unlevel. Some houses have inadequate support; you may need to add beams and posts in the crawl space. Remodeling without first leveling the house will only make things worse: now if you attempt to level it out the old stuff may turn out square and the new stuff won't be. Leveling after remodeling is much more difficult because sheet goods attached to unsquare walls will prevent the walls from being resquared.
Hang the sheetrock on the ceilings, first. Do ALL the ceilings first. Then for the walls, work your way from the point furthest away from the sheetrock stack toward the stack. That way you can carry sheet goods through open stud bays and not have to work them around awkward corners and doorways.
Install ceiling pieces lengthwise across (perpendicular to) the joists rather than along the joists; this will reduce the amount of trimming you have to do. Stagger the end joints.
Same way with the walls, install the sheets horizontally rather than vertically. If the wall height is over 8 feet, butt the bottom sheet against the floor and the top sheet against the ceiling, and put your filler strip in the middle. If it's less than 8 feet, put the upper sheet on first, then trim the bottom sheet putting the cut edge against the floor. Stagger the end joints (like a brick wall). The bulk of your joints will now be at a comfortable working height.
If you don't already have one, rent or buy an electric cutout tool to make the openings for electrical boxes. (Search YouTube for 'drywall cutout tool' to learn how to use one.)
When trimming sheetrock, don't worry about making a tight fit at the joints. You can leave up to a 1/4" gap without causing a problem, and doing so might make it easier to install. Don't start mudding and taping until you're done hanging; focus on one thing at a time.
Last edited by Fencepost; 10-12-2012 at 04:02 PM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.