Is the drywall installer or tile installer responsible for the joints/corners?

Question

We have a project with wall tiles that are 4” x 40”, 8” hex and large 24” x 47-1/8”. The general contractor has drywall figured and states that joints or corners shouldn’t have to be mudded/done by the drywall installer nor primed! Our tile installer said that he wants the joints and corners completed and everything primed before he will install. These areas are not in a wet area. However, the large tile is at a fireplace wall.

What is correct?

Answer

TCNA Handbook Methods (l.) W242 and (r.) W243.

There are two recognized methods for installation of tile over gypsum board found in the Tile Council of North America Handbook. They are methods W243 (thin-set) and W242 (organic adhesive). Both have a section of the method that are titled “Preparation by Other Trades”. In that section it states gypsum board shall be installed per GA 216 “treated with tape and joint compound, bedding coat only (no finish coats). Nail heads one coat only.”

To my understanding primer is not needed. We do recommend slightly dampening the surface of the drywall to help ensure the board does not prematurely draw the moisture out of the thin-set bond coat.

– Robb Roderick,
NTCA Technical Trainer

(continued)

Q: Would you say primer is the responsibility of the tile installer or drywall installer?

A: If we are going to put tile onto the drywall surface and the primer is necessary to prepare the drywall for a successful tile installation, this would be the responsibility of the tile contractor and not the drywall contractor.

Robb Roderick

Robb Roderick has been in the tile industry for nearly 25 years. He has worked with homeowners, builders, architects, and interior design professionals on projects in both residential and commercial settings. Prior to coming onboard with NTCA, Roderick was a member of the association for several years and is a CTEF Certified Tile Installer. He graduated from Missouri State university in 2000 and has also served in the United States Army as a medic. Roderick tours the country bringing NTCA Workshops and CTEF Educational Programs to local audiences nationwide.