Does ceramic tile require a special floor construction?
Standard floor construction of 2″ x 10″ floor joists spaced 16″ on center with 5/8″ plywood subfloor and 3/8″ plywood underlayment is suitable. However, more than 20 years’ experience shows that a rigid, cementitious backer board is superior to plywood as an underlayment. A clean, structurally sound concrete slab is suitable and does not require additional underlayment.