Waterproofing Buildings in Lebanon: Roofs, Balconies, and Bathrooms

Few problems in a Lebanese building drag on like a leaky roof or a balcony that drips onto the floor below. Doing waterproofing right the first time is far cheaper than chasing repeat leaks every winter.

Common systems

• Liquid membranes (polyurethane, acrylic): versatile and good for complex shapes.
• Bitumen sheets (torch-applied): common on flat roofs.
• Cementitious slurries: for bathrooms and water tanks.
• EPDM and TPO membranes: long-life sheet systems for larger roofs.

Before a contractor starts

• Insist on locating and fixing the source — overlay-only jobs often fail.
• Ask for product data sheets and warranty terms in writing.
• Surface prep is half the job: cleaning, drying, repairing cracks, and priming.
• Drainage matters as much as membranes; a clear slope and clean outlets stop ponding.

Bathrooms and balconies

• Bathrooms need waterproofing under the tile, especially around shower areas and floor drains.
• Balcony tile alone is not waterproofing — a membrane under the tile is essential.
• Sealants around drains, parapets, and pipe penetrations are common failure points; check yearly.

Warranties

Quality waterproofing comes with a written warranty (5–10 years is common). Verify whether the warranty covers labour, materials, or both — and what voids it.