Roof waterproofing for residential buildings in Khafji

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

Before we start: what we know about Khafji

The centre of Khafji sits about 9 m above sea level (SRTM open elevation data). Khafji is about 2 km from the sea coast (OpenStreetMap).

Team note on Khafji: 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 Khafji: King Abdullah Road.

Does a flat roof in Khafji really need waterproofing, given that the town is close to the coast? The short answer is yes, and the local setting is one reason. The centre of Khafji sits about 9 m above sea level, and the town is about 2 km from the sea coast. Roofs here are exposed to salt-laden air and to the seasonal rain that can pool on flat surfaces, so a sound waterproof layer protects the structure below. For residential buildings, the right system depends on the roof's condition and how it is used, and several options are available, including liquid roof waterproofing at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m².

A roof inspection usually starts with a walk over the full surface to look for cracks, blistering, ponding water, and failed joints around parapets, drains and rooftop fixtures. Where the damage is in a narrow line rather than across a wide area, the team may recommend crack injection, priced at SAR 40–120 per metre, instead of recoating the whole roof. The inspector will also check the edges and upturns, since leaks often start where the membrane meets a wall. Based on what is found, the visit ends with a clear recommendation of the system, the areas to be treated and the price range for each part of the work.

Before the visit, gather any earlier records of roof repairs, previous leak reports and the date the roof was last recoated, if you know it. Clear loose items such as planters, water tanks stands and stored materials from the roof so the surface can be examined fully. Note the rooms below that have shown damp patches or staining, because these help locate the source of a leak. If the building also has a water tank on the roof, mention it, as tank internal coating is priced at SAR 25–60 per m² and is often reviewed during the same visit. Having this information ready makes the inspection faster and the recommendation more precise.

For a residential building, shared risers, tanks and pumps are checked as one system.

Signs worth paying attention to

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

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.

Quick comparison: facts and costs in Khafji

Questions from Khafji

What we advise against

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

What you receive

The written output: a quality record with photos and the flood-test result. The report is numbered and can be checked with its verification code.