Floor & balcony waterproofing for apartments in Yanbu

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

Why floor & balcony waterproofing differs in Yanbu

Main roads in or near Yanbu: King Abdulaziz Road, Umluj Road, Al Hanan Street. Team note on Yanbu: 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..

Yanbu is about 1.2 km from the sea coast (OpenStreetMap). The centre of Yanbu sits about 6 m above sea level (SRTM open elevation data).

Yanbu's coastal location shapes where a waterproofing check should start. The centre of Yanbu sits about 6 m above sea level, and the city is about 1.2 km from the sea coast, so a technician should begin by looking at how water moves across the slab and balcony edges rather than assuming it drains quickly away. Salt-laden air and warm daytime temperatures also mean that any existing coating, sealant or membrane should be checked for lifting, chalking or hairline cracking before a new system is recommended. Balcony junctions with the wall, drain outlets and the upstand where the floor meets the facade are the first places to inspect, because these are where moisture most often enters an apartment.

Several points are best left to the site visit itself. The technician should judge the real condition of the substrate by sounding it, checking for hollow patches and measuring the moisture the slab is holding, since no general rule can replace that reading. The fall of the surface toward the drain, the width and depth of any cracks, and whether a crack is active or dormant all need to be seen on the day. The choice between a liquid roof system, a bitumen membrane, an epoxy coating or spray foam depends on the surface and how it is used, so the final specification should be set by the person standing on the balcony. Access to the floor below and the condition of the wall finishes there should also be noted, as they affect how the work is sequenced.

To help the technician prepare, the owner should have ready any previous waterproofing records, the age of the building, and a note of where leaks have appeared in the past, such as ceiling stains or damp patches on walls. Photographs taken after rain are especially useful, as they show where water actually pools. It also helps to tell the technician whether the balcony is walked on, used for storage or left open to the weather, since heavy use changes the protection a surface needs. Clear access to the balcony, a stable power point and a day when the surface can stay dry should be arranged in advance, so that the site visit can focus on the checks that matter most for this property.

In apartment buildings, the floor below is often where a leak shows first.

Signs that call for floor & balcony waterproofing

These are the signs most often linked to floor & balcony waterproofing:

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

Causes we see in the field

• A common cause: a blocked drain.
• A common cause: incorrect falls.
• A threshold without waterproofing.

Tools and methods, and when we use them

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.

Quick comparison: facts and costs in Yanbu

Questions from Yanbu

Common mistakes we see

• 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.