Roof waterproofing for apartments in Jazan

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

Roof waterproofing in Jazan: the local context

Team note on Jazan: 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 Jazan sits about 7 m above sea level (SRTM open elevation data).

Jazan is about 1.9 km from the sea coast (OpenStreetMap).

Do roof waterproofing costs in Jazan vary much from one apartment block to another, and what determines them? The answer begins with the site itself. The centre of Jazan sits about 7 m above sea level (SRTM open elevation data), and the city is about 1.9 km from the sea coast (OpenStreetMap). That combination of low elevation and nearby coastal air means roofs here face humid, salt-laden conditions, so the choice of system and its price depend on the roof's area and condition. For liquid roof waterproofing, the rate is SAR 8–25 per m², while bitumen membrane runs SAR 15–35 per m² and XPS boards run SAR 12–30 per m². Where a roof has cracks, crack injection is priced at SAR 40–120 per metre, so the length of defects matters as much as the total area.

Before any work is quoted, the inspection follows a set sequence. The inspector walks the full roof surface and marks ponding areas, blistered sections, cracks, and points where the parapet and drainage outlets meet the membrane. Cracks are measured in metres so they can be priced separately from the open area. The inspector also checks the roof for any connected elements that share the same water path, such as bathroom walls or a rooftop water tank. A tank's internal coating is priced at SAR 25–60 per m², so the tank is recorded as its own line item. Photographs and measurements are then compiled into a written scope for the owner to review.

To make the visit efficient, the property owner should prepare a few things in advance. Gather any earlier waterproofing records, warranty papers, or invoices for the roof, and note where leaks have appeared inside the apartment, including the dates they started. Clear access to the roof hatch and any locked storage, and confirm who holds the keys. Tell the inspector whether the roof is used for drying laundry, storage, or a water tank, because these affect the layout of the work. Having these details ready lets the inspection move straight to measuring and assessment.

In an apartment, a problem may start in your unit or in a shared line; we separate the two before any work.

Signs that call for roof waterproofing

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

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

Causes we see in the field

• Cracks in the roof slab.
• Damaged waterproofing around tank and AC bases.
• Wrong falls towards the drains — 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.

Facts and costs — Jazan

Questions from Jazan

What we advise against

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

The written outputs

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.