National Standard Pe Pp Composite Waterproof Membrane For Basement Moisture‑proof & Seepage Prevention

Product Introduction

Polyethylene‑polypropylene (PE‑PP) polymer composite waterproofing membrane is manufactured by one‑step extrusion composite process, with modified polyethylene as the core waterproof layer laminated with high‑strength polypropylene non‑woven fabric on both sides. The three‑dimensional mesh pores on the non‑woven fabric surface enable interlocking and solidifying integration with cement mortar. Common specifications: thickness 0.6‑1.5 mm, width 1‑1.2 m, roll length 50‑100 m. It is widely applied to waterproofing and anti‑seepage projects for roofs, basements, bathrooms, water tanks, pipe galleries and other buildings.

Specifications & Model

Product Advantages

1. Firm bonding without water channeling: The mesh pores of polypropylene fabric interlock and cure with cement mortar, forming an integral body with cement substrate and cement‑sand protective layer, effectively eliminating the risk of water channeling under the waterproof layer.
2. Applicable for damp substrates: Complete drying of substrate is not required. Construction can be carried out on damp substrates without free water. No open flame is needed for safe operation and shorter construction period.
3. Excellent mechanical properties: High tensile strength, good impermeability, puncture resistance and fatigue resistance. Stable performance within ‑40℃ ~ 60℃, no brittle cracking at low temperature and no deformation at high temperature.
4. Corrosion and aging resistance: Resistant to acid, alkali and underground water corrosion. Formulated with anti‑aging additives for long service life under ground or cement‑sand protection.
5. Eco‑friendly: Non‑toxic, odorless and pollution‑free, suitable for drinking‑water tank waterproofing. Plastering and tile laying can be directly performed on finished waterproof layer, eliminating the need for separation layer.
6. Cost‑effective: Moderate material cost. Construction with ordinary cement reduces auxiliary material expense. Flexible cutting adapts to complex structural details.

Construction Technology (Full‑bonding with cement mortar)

1. Substrate Treatment Ensure firm and flat substrate. Remove dust, oil stains and sharp protrusions; no sanding or hollowing. Form circular fillets R≥50 mm at internal‑external corners and pipe roots. Wet the substrate with water and keep it damp without standing water.
2. Preparation of Cement Bonding Mortar Adopt 42.5 ordinary Portland cement mixed with special rubber powder, add water and stir into smooth paste. Increase rubber powder dosage for vertical‑surface application. Prepare on‑site for immediate use; do not add extra water once mortar initial‑sets.
3. Detail Additional Layer Construction Apply membrane additional layers for corners, pipe roots, floor drains, post‑pouring belts and other joints. Additional layer width ≥500 mm, wrapping width at pipe roots ≥200 mm. Up‑turn waterproof height ≥1800 mm for shower area walls and ≥300 mm for general areas.
4. Membrane Laying

       4.1  Pre‑lay and snap lines to adjust membrane position. Reserve lap width: long‑side lap ≥100 mm, short‑side lap ≥100‑150 mm. Adjacent short‑side joints shall be staggered by more than 500 mm.

       4.2  Evenly spread cement bonding mortar on substrate at thickness 1.2‑2 mm. Roll out the membrane, squeeze air out from center to edges by scraper or roller to achieve tight bonding with bonding rate ≥80%. Do not stretch the membrane during laying.

       4.3  Compact joints with sufficient mortar to avoid edge curling and hollowing.

     5. Protective Layer & Curing After inspection and qualified water‑closing test for finished waterproof layer, construct 20 mm‑thick 1:2.5 cement‑sand protective layer. Set expansion joints and cure by water sprinkling. No walking on waterproof layer within 24 hours to prevent damage.