A A-frame A wooden or metal rack constructed in the shape of an “A” on which large stone slabs are shipped and stored. Abate To cut away so as to leave parts in. Epic Basement Renovation!: 4. Steps (with Pictures)The process of applying drywall compound is often called mudding or skimming. The basic idea is to apply one or more layers of drywall compound (mud) to hide imperfections in the wall - most notably, gaps and screw heads. Between each layer, the dried 'mud' is lightly sanded to maintain a smooth finish. How To Insulate Basement Walls with foam board can save energy and money. Insulate basement walls without worrying about mold after reading this article. Power Engineering Dictionary. ABMA - American Boiler Manufacturers Association. ABRASION - The wearing away of a surface by rubbing, as with sandpaper on wood. PREPARING THE DRYWALL COMPOUNDDrywall compound is usually sold pre- mixed in big tubs. Try to get the "dust control" kind if you can, it makes cleanup easier later on. Just open the tub, mix it up with a clean stir stick, and you're good to go! APPLYING THE FIRST LAYERYou may have noticed that the edges of the drywall sheets are slightly beveled. This is done so that drywall compound can cover the gap and drywall tape, without creating a raised vertical stripe. Start with a narrower trowel, 6 inches is perfect. Just slop on the mud, roughly flattening it against the wall as you go. When the entire length of the gap is covered, skim lightly over it again to get everything smooth and even. Again, this takes a bit of practice to get just right, but I'm sure you'll figure it out soon enough. To cover the screw heads, use a small 3" putty knife and simply skim over the dimpled area. It takes very little mud to do this, and you can often do five or six screws with a single scoop of mud. When you're done, clean up any extra mud that slopped onto the wall or floor before it dries. Be sure to wash off your tools as well - mud doesn't stick to tools as much as Durabond, but it sure is easier to clean off while it's wet. MUDDING INSIDE CORNERSCorners are tricky. I like to use a 3" putty knife to glob a thick layer of mud all along the corner, then use a wide corner trowel to skim over it for a smooth finish. This is probably the hardest part of skimming, and it will take you a while to get it right. Again, I suggest starting in a dark corner first, an moving to the more visible locations when you're more confident in your skills. MUDDING OUTSIDE CORNERSPreviously, you applied Durabond to the outside corners, to cover the metal corner bracing. Once the Durabond is fully dry, you can skim over it with mud for a nice smooth finish. Use a wide trowel that covers from the corner to well past the edge of the Durabond layer. SANDING THE FIRST LAYERWhen drywall compound dries, it turns from a light grey colour to white. It will be hard to the touch, and will feel warmer than damp compound. Usually, this takes a few hours to a full day, depending on the temperature , humidity, and air movement in the room. The first layer can be sanded using a more aggressive sanding pad (1. It doesn't take a lot of pressure, so go easy. You only need to remove the worst of the irregularities. My father in law likes to use a pole sander for this, but I prefer to get up close and do it by hand. Go over everything, using your hand to feel for bumps. In corners, use a special sanding block with abrasive sides that meet at a 9. By the time you finish, the room will be filled with clouds of dust and nearly every inch of you will be covered in a thin layer of dust. When the dust has settled, sweep up as much of it as you can with a broom, then take care of the rest with a vacuum. SKIMMING THE SECOND LAYERThe second layer of mud goes on much like the first, though you will be covering a wider area. Instead of the 6" trowel used for the first skim, use a 1. As before, glop on some mud and skim it smooth. If you work carefully, this may be the last layer you have to do. Some of the screws may need a second layer of mud as well. Use the same 3" putty knife as before. SANDING THE SECOND LAYERFor this layer, switch to a higher grit sandpaper, such as 1. This will leave a smoother finish. Carefully sand everywhere, making sure not to remove too much material. Take special care to blend the edge of the mud into the wall, for a nice smooth transition. Use long sweeping motions for better blending. When the sanding is done, go ahead and clean yourself and the room once again. Hopefully, you'll only need to do two skims, but in some areas three may be required. It shouldn't take more than that, though.
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