Below Ground & Basement Waterproofing

Basement Wall Waterproofing

Use cases: waterproofing new and existing basement structures, including walls and floors. Robust and reliable tanking from the inside where external excavation is not possible.

• 1Concrete or masonry wall construction — cast-in-situ, blockwork or precast — forms the base substrate, for retrofit or new-build projects.
• 2Surface preparation includes grinding, smoothing and priming; all defects, honeycombing or cracks are repaired before waterproofing begins.
• 3Multiple coats of Gaco LM60 are spray- or roller-applied to a minimum target dry film thickness of 2 mm — a monolithic barrier against water ingress.
• 4Reinforcement mesh or fleece is embedded at corners, junctions, penetrations and movement-prone areas to distribute stress.
• 5Optional vapour control layers, thermal insulation or protection boards can be incorporated over the membrane.
• 6Drainage channels, cavity drain membranes or perimeter floor channels can be added at the wall base to manage residual water pressure.

The LM60 system creates a continuous basement tanking barrier, applicable to both positive-side (external) and negative-side (internal) installations.

Piling Wall Waterproofing

Use cases: waterproofing complex retaining systems, especially in urban basements and deep foundations, applying LM60 directly to sheet, secant and contiguous piling.

• 1A piled substrate of sprayed or cast concrete, sheet or secant piles forms the primary structure — accommodating irregular pile shapes and tie-back penetrations.
• 2Gaco LM60 is applied directly onto the pile face, forming a monolithic layer with no weaknesses at joints or terminations.
• 3Reinforcement fleece or high-tensile mesh is embedded over joints, cracks and transitions where required.
• 4A seamless LM60 spray-applied shell fully encapsulates the piled wall, adapting to every contour.
• 5A protection system, drainage board or cavity drainage layer (such as GacoPoly Below Grade Shield) is installed over the membrane to protect it during backfilling.
• 6Supports rapid construction sequencing and faster coverage over large retaining structures — no reliance on rigid membranes or shotcrete sandwiching.

Between-Slab Waterproofing

Use cases: podium decks, transfer slabs, green roofs and landscaped areas where waterproofing must remain fully protected between structural layers.

• 1A primary structural slab serves as the foundation for subsequent waterproofing treatments.
• 2A spray-applied, seamless GacoFlex LM60 membrane is installed as a continuous waterproofing layer with superior adhesion, flexibility and crack-bridging.
• 3Reinforcement fleece or mesh strengthens the membrane where structural movement or dynamic loads demand it.
• 4A screed or reinforced topping slab is poured directly over the membrane, protecting it through construction and service life.
• 5Optional insulation boards or tapered systems create falls and improve thermal performance — including green and inverted roof configurations.
• 6For landscaped areas, a root-resistant protection course and drainage layer safeguard the membrane from root penetration and waterlogging.

The system accommodates podium terraces, planters, car park decks and service zones — long-term waterproofing continuity across critical, high-traffic zones.