Roof waterproofing for duplexes in Sharurah

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

Why roof waterproofing differs in Sharurah

Team note on Sharurah: 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.. Main roads in or near Sharurah: King Abdulaziz Road, King Fahd Road.

The centre of Sharurah sits about 724 m above sea level (SRTM open elevation data).

Picture a family who bought a duplex in Sharurah to share between two households. The upper unit is occupied by one family and the lower by another, and both share a flat roof that has been in place for years. After a few seasons, the owner notices stains on the ceiling of the top floor and a faint damp smell after rain. The question they face is simple: is the roof letting water in, and what should be done before the damage spreads to both homes?

The local facts matter here. The centre of Sharurah sits about 724 m above sea level, which places the town on high ground in the southern part of the Kingdom, where the climate and the way water moves across roofs can differ from coastal cities. For a duplex, the practical point is that the roof is shared, so a leak in one unit often becomes a problem for the other. Liquid roof waterproofing is priced at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m². These ranges give an owner a sense of the options before deciding which system suits the roof's condition and the budget of both households.

Start with an inspection of the whole roof surface, not just the stained patch, because water travels along the slab before it appears indoors. Mark every crack and measure its length, since crack injection is priced at SAR 40–120 per metre and should be treated before any surface coating. Clean the roof thoroughly and let it dry, then repair the cracks and any loose edges. Choose the membrane or liquid system that matches the roof's condition, and apply it in the order the product requires. Finally, check drainage outlets and keep them clear, and arrange for a short inspection after the first heavy rain to confirm the work has held.

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

When do you need roof waterproofing?

The following signs are worth checking before they grow:

• The old waterproofing is cracking
• Water pooling on the roof
• Stains on the top-floor ceiling after rain

The most common causes

• A common cause: cracks in the roof slab.
• Wrong falls towards the drains — we check this before anything else.
• Damaged waterproofing around tank and AC bases.

Tools and methods, and when we use them

How the work is done, step by step

1. Survey: Falls, drains and the condition of the old layer are recorded.
2. Preparation: Cleaning and repairs before any new layer.
3. Primer: The base coat that the system needs.
4. Waterproofing layers and details: Corners, upstands and bases get their own detail.
5. Flood test: The roof is flooded and checked before it is covered.

Facts and costs — Sharurah

Short answers for Sharurah

What we advise against

• Ignoring the tank bases
• Covering the waterproofing before the flood test

What you receive

You receive: a quality record with photos and the flood-test result, in a technical report with a verification code.