comack

Hardibacker/Green Board Seams

I am in the process of drywalling a bathroom. What do I do where the drywall and Hardibacker meet? Do I tape and bed the Hardibacker/Green Board seams just like I would a standard drywall seam or do I do something else? Thanks

coops28

Yes, you do cover it just like any other seam. However you shouldn't have much to cover since tile goes over the hardibacker...right?

marksr

I would fill the seam with thin set and let the tile overlap onto the drywall. You won't need to tape.

cilla2004

I just did this

I would never again use hardibacker 1/2 inch for the walls behind my shower. Why? Hardibacker 1/2 inch is not 1/2 inch thick, it is less than one half inch thick. So where we abuted the greenboard at the top of the shower and sides, we had to taper the joint using thinset and tape(the mesh type). I would use wonderboard or something which is actually 1/2 inch thick. It is a pain to taper the joint and you shouldn't have to if Hardibacker made their board the correct width.

I can't say hardibacker is a bad product, we haven't even used the shower yet, still waiting to do the grout sealer, but if it says it's a half inch, make it a half inch! You can see my tiling job on the Ceramic Tile forum under 'My Experience with glass and ceramic mosaic tile".

marksr

Although I have never paid much attention to the various brand names all the 'wonderboard' that I have used has always been 1/4" or 1/2" and never noticed in major variance.

cilla2004

Brand name

Hardibacker 500 is a brand name of board, which according to the website is: Portland cement, ground sand, cellulose and selective additives. It contains no asbestos, formaldehyde, gypsum or glass fibre.

Wonderboard is a brand name of a cement board.