Floor & balcony waterproofing for duplexes in Najran

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

Floor & balcony waterproofing in Najran: the local context

Team note on Najran: 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.. The centre of Najran sits about 1309 m above sea level (SRTM open elevation data).

Main roads in or near Najran: Al Jarba Street.

Najran sits in the southwest of Saudi Arabia, and the centre of the city lies about 1309 m above sea level (SRTM open elevation data). That height means the town gets a different climate than the coast. Days can be warm and dry, but rain, when it comes, often arrives in short, heavy bursts that test roofs and balconies hard. For a duplex owner, the practical effect is that water tends to pool and find weak points quickly, so a balcony or roof that looks fine in dry months can still leak after a storm.

Because of this, the service here starts with the surfaces that take the most water. Liquid roof waterproofing, priced at SAR 8–25 per m², is often the most economical way to seal a flat roof shared by upper and lower units. Bitumen membrane, at SAR 15–35 per m², is another option for roof areas where a sheet layer suits the structure. For balconies, which trap water at their edges and against the door threshold, crack injection at SAR 40–120 per metre is used to close hairline cracks before any coating goes on. Epoxy coating, at SAR 35–90 per m², is applied where a harder, easier-to-clean finish is wanted. Each figure is a range, and the final cost depends on the size of the area and the condition of the surface underneath.

Owners in Najran often make the same avoidable errors. The first is covering a crack instead of injecting it, which lets water keep moving underneath the new layer. The second is skipping the cleaning and drying step, so the coating cannot bond to dust or damp concrete. The third is treating balconies as an afterthought and sealing only the main roof, even though balcony water runs down into the rooms below. The fourth is leaving a sloped surface untreated at its low corners, where water always collects. Avoiding these mistakes costs far less than repairing ceilings and walls that have already been stained by a leak.

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

When do you need floor & balcony waterproofing?

The following signs are worth checking before they grow:

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

Causes we see in the field

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

How we choose the tool in Najran

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.

Facts and costs — Najran

Short answers for Najran

What we advise against

• Tiling a balcony without waterproofing

The written outputs

The written output: the flood result and photos of the details. The report is numbered and can be checked with its verification code.