Premium Basement Bathroom Waterproof & Moisture-Proof Insulation Backing Board

High-density polystyrene core with reinforced aluminum foil layer for ultimate moisture resistance and thermal insulation. Precision-engineered tongue-and-groove edges ensure seamless installation and airtight performance.

Fire-retardant material (Class B1 standard) with 99% vapor barrier efficiency, ideal for basement walls, shower enclosures, and laundry rooms. Zero formaldehyde emission, passes ASTM E84 safety certification.

3-in-1 solution: blocks condensation, reflects heat (R-value 4.5), and reinforces wall structure. Prevents mold growth even in 100% humidity environments. Cut-to-fit design works with tile, vinyl, or drywall finishes.

Manufactured with CNC-cut precision for ±0.5mm tolerance. Compatible with radiant floor heating systems. 15-year warranty against delamination or thermal degradation.

Wholesale exclusive: factory-direct pricing with MOQ flexibility. Pallet quantities ship globally with DDP terms. Custom sizing available (standard 1200x600x20mm).