Floor & balcony waterproofing for duplexes in Jazan

Prepared by the technical team · editorial review · last updated 13 November 2026 · Sources

Before we start: what we know about Jazan

Jazan is about 1.9 km from the sea coast (OpenStreetMap). The centre of Jazan sits about 7 m above sea level (SRTM open elevation data).

Team note on Jazan: Kashf teams serve this city and its nearby districts with the same documented inspection standard: device-based leak detection without demolition, a written report, and a clear scope before any work begins..

Floor and balcony waterproofing for duplexes in Jazan begins with the location itself. The centre of Jazan sits about 7 m above sea level (SRTM open elevation data), and the city is about 1.9 km from the sea coast (OpenStreetMap). Because the city is close to the coast and only a few metres above sea level, a technician first looks at how water moves across the upper floor and balcony slabs, and whether it has a clear route to drain away from the building. Standing water on a balcony or a floor edge that slopes the wrong way is treated as a priority before any coating is discussed.

Several checks are left to the site visit, because they depend on what is actually there. The technician examines the existing finish on the floor and balcony, looks for hairline cracks and points where old sealant has failed, and checks the junctions between the floor and the walls, the drainage outlets, and the bathroom edges that sit above the living space. The choice of system also depends on the surface: a bitumen membrane, a liquid roof system, an epoxy coating or a spray foam layer each behaves differently on a balcony than on a bathroom floor. Where cracks are active, crack injection is priced per metre and is quoted only after the length is measured on site. Nothing is assumed in advance; the visit decides the scope.

To help the technician prepare, residents can note when leaks have appeared, whether they follow rain or occur during use of the bathroom above, and which rooms lie directly beneath the balcony or floor in question. Photographs of ceiling stains, a rough sketch of the balcony with its drainage points, and the approximate area of each floor or balcony section all make the visit faster. Access to the floor below, if the stain is there, should be arranged in advance. Where a bathroom sits over a living room, say so, since that changes the preparation work. Clear information at this stage means the technician can plan the materials and the time needed, and the household gets a clearer picture of what the work will involve.

In a duplex, the two floors often share lines, so tests are done floor by floor.

Signs worth paying attention to

If you notice one of these signs in Jazan, it is a good moment to talk to the team:

• A wrong fall towards the door threshold
• Water passing from the balcony to the floor below
• Damp under the light well

Where the problem usually comes from

• A common cause: incorrect falls.
• A threshold without waterproofing.
• A blocked drain — we check this before anything else.

How we choose the tool in Jazan

The steps in order

1. Checking the falls: Where water collects and where it should go.
2. Details: Thresholds, drains and upstands.
3. Waterproofing: The layer is applied and protected.
4. Flood test: Tested before the finish goes on.

Jazan in facts and sources

Short answers for Jazan

What we advise against

• Tiling a balcony without waterproofing

What you receive

You receive: the flood result and photos of the details, in a technical report with a verification code.