Microcement floors are one of the most transformative upgrades available for New York City apartments — a seamless, contemporary concrete-look surface that eliminates grout lines, reads as architecturally significant, and wears beautifully over time. Here's everything you need to know before specifying them.
Microcement Floor Substrate Requirements
The most critical factor in microcement floor success is the substrate condition. Microcement is a thin-film system (3 to 5mm thick) that must be applied over a stable, flat, crack-free surface. On concrete subfloors, this usually means grinding flat and filling any cracks or divots before application begins. On wooden subfloors — extremely common in NYC pre-war apartments — the subfloor must be checked for deflection (movement), because microcement will crack over a subfloor that moves. In many cases, adding a layer of 1/4-inch plywood before the microcement system is appropriate.
The Application System
Professional microcement floor systems are multi-layer: primer, base coat (typically two layers), top coat, and sealer. Each layer must fully cure before the next is applied. On floors, the base coats are applied with a flexible trowel in a consistent direction; the top coat is applied with a finer trowel to a smoother finish. Total application time for a standard NYC bathroom floor: 3 to 5 days. For a full open-plan living floor, 5 to 8 days.
Sealing: The Make-or-Break Step
Microcement floors without proper sealing will stain, scratch, and deteriorate rapidly. The sealer choice determines performance: water-based polyurethane sealers are appropriate for residential floors with moderate traffic; polyaspartic sealers provide maximum durability for high-traffic floors and areas near water. Two to three coats of sealer are standard. Re-sealing every three to seven years maintains optimal performance.
Maintenance
Daily: pH-neutral cleaner diluted in water, applied with a damp mop — never soaking wet. No vinegar, no bleach, no abrasive cleaners. Avoid dragging furniture across the surface. Area rugs in high-traffic zones extend sealer life. With proper care, a well-installed microcement floor is genuinely more durable than most tile systems.
Cost in NYC
Microcement floors in New York City typically run $18 to $28 per square foot all-in, including substrate prep, application system, and sealer. A 100 sq ft bathroom floor runs $1,800 to $2,800. A 400 sq ft open-plan living area runs $7,200 to $11,200.