3FT x 110FT (325 Sq Ft) Professional Ultra Wide Waterproof Membrane Roll, Large Coverage for Commercial Steam Room — Open-Box, 11% Off

our waterproof membrane comes with 6in standard narrow width & exclusive 35in extra wide width for your choice. The 35in wide roll drastically reduces splicing seams during large-area installation, effectively lowering hidden water leakage risks and cutting your construction time by half. We provide 4 complete size combinations (18/54/108/325 sq ft coverage) to fit small bathroom touch-ups, full shower renovation, and large commercial sauna projects, ideal for both DIY homeowners and professional contractors.

Made of thick 0.6mm (23.6 mil) high-density polyethylene core, this shower underlayment forms a fully impermeable shield to block water and vapor penetration permanently. It outperforms thin glass fiber membranes in anti-aging, tear resistance and long-term moisture resistance. Effectively protect tile, ceramic, marble and wood flooring from damp, mold, cracking and water damage, keeping wet areas dry for years of use.

Balanced flexibility and durability design makes the membrane easy to cut with regular scissors or utility knives, and freely folded to fit all corners, walls, floors and curved surfaces. Double-sided fleece fabric layers anchor tightly with standard unmodified thin-set mortar, avoiding hollowing, peeling or displacement during tiling. No complicated tools or professional skills required for quick, smooth installation.

Our waterproof underlayment works perfectly for all indoor & outdoor wet spaces: shower walls & floors, full bathrooms, kitchen floors, steam saunas, laundry rooms, pool surround and commercial wet zones. Compatible with marble, ceramic, cement, stone and all tile types, widely used in family houses, hotels, spas and construction engineering projects.

We strictly control the thickness, tensile strength and waterproof performance of every roll of membrane to deliver consistent long-lasting protection. Every product undergoes strict quality inspection before shipment. If you have any questions about size matching, installation or product performance, our professional customer service team will provide fast, targeted solutions to fully guarantee your shopping experience

This heavy-duty shower waterproof membrane is crafted from 0.6mm (23.6 Mil) high-density polyethylene with double-sided fleece layers. We offer 6in narrow and exclusive 35in extra-wide rolls in 4 sizes to cover small bathroom repairs and large commercial sauna projects. It creates a full vapor barrier to stop moisture penetration, prevents tile cracking and floor mold, and folds easily for quick DIY installation with thin-set mortar, ideal for bathrooms, kitchens, saunas and all indoor wet areas.