A Guide To Drywall Sizes
Drywall comes in many different sizes. Learn how to choose the right panel for your next project.
Which size drywall works best?
Most people probably picture the standard 4×8 panel when they think of drywall, even though it’s by no means the only size or type of drywall available today. Panels come in a wide variety lengths, widths and thicknesses. There are also “special use” panels, including moisture/mold-resistant, fire-resistant, and impact or abuse-resistant. Which size drywall you choose to hang can make a big difference in the final appearance and lasting quality of a finished wall assembly. Let me show you what works best for me.
Myron Ferguson is a drywall and building performance contractor. He is the owner of Ferguson Drywall Innovations, Inc. and is from Middle Grove, NY
Panels are available in four thicknesses—5/8-in., 1/2-in., 3/8-in., and 1/4-in. (above are all 5/8-in.). Each size has specific applications and framing requirement. The 3/8-in. and 1/4-in. panels are only available in shorter lengths. Regular 1/2-in. drywall was the most commonly used drywall in new residential construction and remodeling, but lightweight drywall is rapidly replacing this heavier drywall.
Why use lightweight drywall?
Hanging drywall is hard work, in large part because it is heavy! A sheet of regular 1/2-in. drywall weights about 60 pounds. The new lightweight drywall weighs about 41 pounds. A drywall hanger can hang an average of 60 4×8 sheets a day. If the hanger is installing regular drywall, that adds up to about nine tons a week. Installing lightweight drywall will reduce that amount down to six tons. That’s still a lot, but having to lift three tons less every week will increase production and decrease the risk of injury.
Lightweight drywall is also a little stronger, which means less damage to the edges when handling and more resistance to sagging. Lightweight panels meet all International Building Code, International Residential Code and ASTM C1396 Specification for Gypsum Board, for both 1/2-in. gypsum wallboard and 1/2-in. gypsum ceiling board.
Because of the superior sag resistance, compared to regular 1/2-in. drywall, lightweight is ideal for ceilings that have joists 24 inches on center. Regular 1/2-in. drywall has always been approved for use on 24-in. spacing on ceiling framing, but because of heavy sagging insulation, wet ceiling textures, or higher humidity, either a 1/2-in. ceiling board or 5/8-in. drywall was usually the best choice. But now a 1/2-in. lightweight product can be used throughout the job. That means there’s really no reason to be lugging around those 70-lb. 4×8 sheets of 5/8-in. drywall.
Lightweight drywall pros and cons
The new lightweight drywall looks the same as regular drywall; the screw spacing is the same; the paper face is the same, and it scores and cuts the same. The drywall supply yards are big fans of lightweight drywall, because it doesn’t sag as much when forking it around, and the lighter weight causes less wear and tear on their delivery trucks. And of course, it’s lighter!
The core on lightweight is a little harder, so utility knife blades do get duller faster when scoring it. And a drywall rep recently told me that because the lightweight drywall has less mass, it’s not as good of a product for sound control as the old version. Not sure what the difference in the STC rating is exactly, but it is something to think about.
Lightweight panels are available in standard lengths, including 8-ft., 10-ft., 12-ft., 14-ft. and 16-ft. panels, and come in both in 48-in. and 54-in. widths.
Why use different lengths?
Most 5/8-in. and 1/2-in. panels are available up to 16 feet long. Longer lengths help eliminate or reduce the number of butted seams, or butt joints. A butted seam is created when the ends of the panels are butted together. Butted seams are unavoidable when the wall or ceiling is longer than the available length of drywall. It’s always best to avoid butted seams because, unlike the sides of panels, the ends are not tapered, so hiding a butted seam is more difficult for the taper.
I have visited a lot of drywall jobsites over the years, and I would say that most of the jobs were stocked with just 12-ft. lengths. I experienced this when I was out in Eagle Colorado last winter, and we had ordered my usual variety of lengths and all that showed up was 8-ft. and 12-ft. lengths. The supplier said that was all they stocked because that was all anyone ever asked for.
I prefer using a variety of lengths because I end up with less butted seams. I also believe that ordering a variety of sizes produces less waste and saves time. For example, if a wall is 13 feet long, I will order two 14-ft. sheets and end up with two 12-in. scraps. If I only had 12-ft. sheets available, I would most likely have to cut the length to hit a stud, and then I would have to cut and fit the pieces which would be cut out of another 12-ft sheet.
It would take more time to hang the wall using 12-ft. sheets and would take longer to tape the additional butted seams. And oh yeah, there are butted seams that could have been avoided.
It’s true that ordering fewer sizes does make a job easier to estimate and easier to stock for the delivery guys. And the argument could be made that having the length you need always nearby would save time, but less butt joints is less butt joints (even if time saving is a wash).
Why use 54-in. drywall?
Again, the less seams/joints the better. When hanging drywall on walls that intersect 8-ft. (or lower) ceilings, two 4-ft.-wide panels of drywall hung horizontally results in just one seam running the length of the wall. But more and more homes are being constructed with 9-ft. ceiling heights, which means that 4-ft.-wide drywall creates two horizontal seams on each wall. The best way to avoid the extra seam is to use 54-in.-wide panels. These wider panels are available in regular drywall as well as moisture, mold and fire-resistant panels.
NOTE: Not all drywall suppliers are going to stock the longer lengths or even some of the more specialized types of drywall, but if you plan far enough ahead, and if large enough quantities are needed, most products can be special ordered.