Concrete Board Joint Compound

Plan the installation so the last column of tiles overlaps the.

Concrete board joint compound.

At 12 a sheet or so for backer i d start over and do it the right way. This type of wall material can be finished just like ordinary drywall using joint tape and joint compound. Joint compound is used to help provide a seal between the durock panels and to fill the depressions left by either nails or screws during installation. Having the cement board alkali resistant screws joint tape and mortar will get you one step closer to installing the tub surround the right way.

Redgard is approved for use over drywall but drywall joint compound is not the right thing for filling those joints according to the cement board manufacturers and thats the wrong tape as well. Durock cement boards are a type of drywall reinforced with cement for a harder surface. Do not use lightweight setting type joint compounds or ready mix joint compounds directly over usg durock cement board. Dab additional compound over the screw holes on both the drywall and cement boards near the seam but not under the tape.

We utilized the same thin set that will be used to attach the tiles. Instead of using drywall joint compound to embed the tape in the cement board you should use thin set mortar. Make the seam just wide enough to cover the entire surface of the tape generally 3 inches. Setting type joint compound lightweight joint compound all purpose compound and others all have their unique uses.

Formed in a continuous process of aggregated portland cement slurry with polymer coated glass fiber mesh completely encompassing edges and back and front surfaces edges. The joint between cement board and greenboard is similar to the joint between two pieces of cement board or two pieces of drywall. Lightweight all purpose drywall compound and easy sand 45 minute. Get it smooth and flat.

Spread joint compound over the length of the tape with a 6 inch drywall knife. Thick cement board spans studs spaced 16 in. Cement board technically called cementitious backer unit cbu is manufactured under different brand names. Thick weighs 45 to 60 lbs.