Floor & balcony waterproofing for duplexes in Tabarjal

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

Why floor & balcony waterproofing differs in Tabarjal

The centre of Tabarjal sits about 548 m above sea level (SRTM open elevation data). Team note on Tabarjal: 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 leaks in duplexes usually start at the joints where the balcony slab meets the main structure, and at the edges of tiled floors where water collects and slowly finds its way into the rooms below. In a duplex, that water often shows up first as staining on the ceiling of the unit underneath, which makes the problem look like a neighbour's issue when it actually starts in the upper floor. Because the upper and lower units share a slab, a repair that only treats the visible surface rarely solves it.

Tabarjal sits about 548 m above sea level, and that elevation matters for the approach. Sites at this height can see strong sun during the day and cooler nights, so surfaces expand and contract more than in low coastal areas. This movement tends to open hairline cracks in balcony slabs and at the upstand where the floor meets the wall. For that reason, crack injection is often part of the job before any membrane goes down; sealing a crack costs roughly SAR 40–120 per metre, and it is worth treating these lines first rather than covering them. On exposed balconies, a flexible membrane or spray foam layer that can move with the slab is usually a better fit than a rigid coating. Bitumen membrane, priced at SAR 15–35 per m², and spray foam, at SAR 20–45 per m², are common choices, while epoxy coating, at SAR 35–90 per m², suits interior floors that need a hard, washable finish.

Before the visit, ask the provider which area they will measure and whether the quote covers crack injection, drainage outlets and upstands, since these are often left out. Ask whether they will check the unit below for signs of water, and whether the work includes protection for the tiles or screed you already have. Request a quote broken down by surface type so you can compare the balcony, the bathroom and any roof area separately. It also helps to ask how long the membrane needs to cure before the balcony can be used again, so your household can plan around the work.

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

When do you need floor & balcony waterproofing?

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

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

Causes we see in the field

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

Tools we use in Tabarjal

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.

Quick comparison: facts and costs in Tabarjal

Questions from Tabarjal

Common mistakes we see

• Tiling a balcony without waterproofing

The written outputs

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