Floor & balcony waterproofing for residential buildings in Yanbu

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

Before we start: what we know about Yanbu

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).

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..

Consider a homeowner in Yanbu who lives in an apartment building with a balcony that has begun to show dark damp patches on the ceiling below. The owner wants the leak fixed once and properly, without tearing up the whole floor, and needs to understand what the work should cost before agreeing to anything. This is the typical situation for residential floors and balconies here, and it is worth planning before any contractor arrives.

Yanbu's centre sits about 6 m above sea level, and the city lies roughly 1.2 km from the coast. For a balcony or roof, this means the building is close enough to the sea for salt-laden air to reach surfaces, so exposed concrete, render and metal fixings can deteriorate faster than owners expect. Because the land is low and close to the water, moisture has fewer places to drain away, which makes sealing the top surface of a balcony or roof more important than in an inland city. Cracks that let water through are the most common route into the rooms below, so they should be treated early rather than left to spread.

A sensible sequence starts with an inspection. Walk the balcony or roof after rain or a washing with a hose, and mark every crack, low spot where water stands, and gap around railings or drains. Next, match the repair to the surface: cracks are usually injected or sealed first, then the whole area is covered with a suitable system such as liquid roof waterproofing, a bitumen membrane, or a spray foam layer, depending on whether the surface is flat and exposed or enclosed. Ask for the work to be priced per square metre or per metre of crack so the scope is clear. Finally, check that the new layer is continued up the walls and into drain outlets, and keep the written scope and the date of completion for future reference.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

Signs that call for floor & balcony waterproofing

The following signs are worth checking before they grow:

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

Causes we see in the field

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

Tools and methods, and when we use them

How the work is done, step by step

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.

Yanbu in facts and sources

Short answers for Yanbu

Mistakes that cost more

• 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.