Installing tile or sheet backsplashes directly onto standard drywall is a common practice in residential kitchen remodeling, provided the wall surface is clean, dry, primed, and structurally sound. For standard prep counters away from heavy direct water exposure, drywall serves as an adequate backing when paired with appropriate mastic or thinset mortar. However, in high-moisture zones directly behind a kitchen sink or a busy cooking range exposed to steam and grease, relying solely on unsealed drywall is risky, and utilizing a water-resistant cement backer board or applying a high-grade moisture-resistant primer is strongly recommended to prevent wall degradation over time.
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