EPDM Geomembrane Liners for Exposed Water Containment

Subgrade preparation is critical for all EPDM lining systems. The substrate must be smooth, compacted to 95% Proctor, and free of protrusions, sharp edges, organic material and standing water before membrane deployment. On earthen embankments and dam slopes, a needle-punched geotextile protection layer is recommended between the subgrade and membrane where subgrade particle size, root penetration risk or construction traffic presents a puncture hazard.

For fully adhered systems, the substrate and underside of the membrane are coated with Carlisle bonding adhesive and allowed to reach tack before the membrane is rolled into place and broomed down. Seams between adjoining panels are completed using HP-250 primer applied to the splice area in conjunction with SecurTAPE or Factory-Applied Tape. All seams must be rolled with a silicone-bearing hand roller to ensure full contact and eliminate air entrapment. In temperatures below 5°C, the primed splice area must be heated with a hot-air gun before and during tape application.

For corrugated steel and sectional tank lining, the membrane is cut and fitted to the internal tank geometry with wall drapes installed first, followed by the base liner. The liner is terminated at the tank rim using termination bars and fasteners aligned to the bolt pattern of the corrugated rim, sealed with lap sealant and water cut-off mastic at all penetrations and fittings. All pipe penetrations are flashed using pressure-sensitive ELASTOFORM flashing or pressure-sensitive pipe seals. A full system review and material schedule should be completed by our technical team prior to order for tank lining projects.