What is Sheetrock joint compound?

Asked By: Gervasia Ploogt | Last Updated: 14th June, 2020
Category: home and garden indoor environmental quality
4.5/5 (30 Views . 32 Votes)
Joint compound (also known as drywall compound or Mastic) is a white powder of primarily gypsum dust mixed with water to form a mud the consistency of cake frosting, which is used with paper or fiber joint tape to seal joints between sheets of drywall to create a seamless base for paint on interior walls.

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Then, is there a difference between joint compound and drywall compound?

Drywall Joint Compound The main ingredient in joint compound -- or mud -- is gypsum, and it's the product that you use for taping and finishing drywall seams. You can also use it to patch holes, although it takes longer to dry and shrinks more than spackling paste.

Beside above, what are the ingredients in drywall mud? The compound is a complex combination often including water, limestone, expanded perlite, ethylene-vinyl acetate polymer, attapulgite, and other ingredients. The delicate mixture of compounds gives it a creamy texture that spreads easily onto drywall surfaces and then hardens as the moisture evaporates.

Regarding this, what is joint compound used for?

Drywall mud, also called joint compound, is a gypsum-based paste used to finish drywall joints and corners in new drywall installations. It's also handy for repairing cracks and holes in existing drywall and plaster surfaces.

Is joint compound the same as mud?

Joint compound is most often used when new drywall is hung. Joint compound (also known as drywall mud or simply known by pros as mud) is also comprised mainly of gypsum dust that you mix yourself to a cake frosting-like consistency.

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How do you smooth walls with joint compound?

Joint compound is thick, so use water to thin it to the consistency of thick cake batter. Invest in a mixing paddle for about $10 and use an electric drill to do the mixing. Pour some mud in the tray and spread it on the wall. Start at an upper corner and work from the ceiling down.

How many layers of drywall mud do I need?

Apply three or more coats of very thin compound rather than one or two heavier coats. Yes, it takes time for the compound to dry, but don't try to rush the drywall taping process along by applying fewer, thicker coats.

Can you mud drywall without tape?

Drywall tape serves a single purpose: To help make the seams invisible. Drywall tape does not offer an mechanical strength at all. If you skipped the drywall tape and just used joint compound to fill in the seams, the seams would become visible again after the compound dried. Joint compound shrinks!

How do you even out seams on drywall?

Spread the compound into depressions in the drywall and scrape it flat with a 10- to 12-inch drywall knife. If there are ridges or visible seams, spread the joint compound on either side of them and scrape it flat with the surrounding wall. Don't try to make them disappear on the first coat.

Why did my drywall mud crack?


Ready-mixed joint compound, the most common form of drywall mud, contains water. When the water evaporates, the joint compound shrinks because the remaining particles take up less space. This causes slight, shallow cracks to develop across the surface of the joint compound application.

Is mesh or paper tape better for drywall?

In general, paper drywall tape is slightly stronger and more versatile, but mesh tape has a more manageable learning curve and better moisture resistance.

Can joint compound be used as a skim coat?

Skim-coating is the technique of applying thin layers of gypsum-based joint compound over the entire surface. Skim-coating can also be used to smooth a textured surface. Skim-coating does not require any arcane skills. It is a matter of troweling on the coating, then spreading it thin with a wide, drywall taping knife.

How thick can you apply joint compound?

You can avoid a lot of extra work later by making sure paper tape is thoroughly embedded in the joint compound. Start by laying a thick bed of joint compound down the center of the seam. Then smooth it down to a consistent thickness of about 1/8 in. with your 5- or 6-in.

Is it necessary to tape drywall joints?

In almost all cases, you need to apply drywall tape to the seams to reinforce the compound and keep it from crumbling out when dry. Drywall pros use paper tape, because it's fast and offers the smoothest finish, but it can be difficult to work with.

What are the different types of drywall mud?


When shopping for drywall mud you may notice different types of pre-mixed mud. The three most commonly used are "all purpose", "lightweight all purpose" and "topping". There are of course several other types of joint compound available however these are the most common.

Should I use spackle or joint compound?

Spackle. Joint compound is the better choice for taping and finishing drywall seams whereas Spackle is the better choice for filling in small to large sized holes in your walls. Now, that doesn't mean you can't fill holes with a quality joint compound, but joint compound typically dries much slower than spackle.

What is the best drywall mud to use?

All-Purpose Compound: As an alternative drying type of drywall mud, all purpose compound can be used in lieu of both taping and topping compound. It is the type that is most commonly used because it works for all three layers and can even be used to add texture.

Is joint compound the same as filler?

So far, the translations we have for the joint compound are: “Drywall joint compound” in the United States (guys in the construction industry call it “mud”) “Drywall filler” in Canada. “Joint filler” in the UK.

Is Wet drywall mud toxic?

"A study by the National Institute for Occupational Safety and Health (NIOSH) has shown that "nuisance dust" from joint-compound mud used in drywall work can contain toxic materials. And, there can be dangerously high amounts of dust from sanding and other drywall work.

What kind of mud do you use to tape?


All-purpose joint compound, commonly called mud, is the wet material that is used for drywalll installation to adhere paper joint tape, fill joints, and to top paper and mesh joint tapes, as well as plastic and metal corner beads. It can also be used to repair holes and cracks in drywall and plaster.

What is the difference between blue and green joint compound?

Green is all-purpose “heavy weight” and has no bearing on where it's used as far with greenboard or whatever. Green is a stronger compound than the “light weight” blue so it's preferred for all joint taping and screw covering.

What is the difference between plaster and joint compound?

Mud and Hot Mud
To make a gypsum plaster, manufacturers add cross-linking chemicals to bind the mixture. Without these hardening chemicals, the gypsum paste is called drywall joint compound, or mud -- with them added, the mixture variously becomes patching compound, plaster of Paris or hot mud.