Roof waterproofing in Jazan: before summer & rain season

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

Roof waterproofing in Jazan: the local context

Jazan is about 1.9 km from the sea coast (OpenStreetMap). The centre of Jazan sits about 7 m above sea level (SRTM open elevation data).

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..

Roof leaks in Jazan most often start with cracks and worn surface coatings that let water into the roof slab, and the damage usually shows up as stains on ceilings in the rainy months. The centre of Jazan sits about 7 m above sea level, so rainwater drains off roofs fairly quickly, but that also means surfaces that have lost their protection are exposed to heavy runoff and repeated wetting. Before choosing a system, the surface should be checked for hairline cracks, ponding spots and failed sealant around parapets and roof drains.

Local conditions change the approach in a few ways. Jazan is about 1.9 km from the sea coast, so salt-laden air is present and can break down coatings faster than in inland areas, which is why the choice of material matters. For roofs with cracks, crack injection is priced per metre at SAR 40–120 per m, and it is usually done before any surface layer goes on. For the roof surface itself, liquid roof waterproofing costs SAR 8–25 per m², bitumen membrane costs SAR 15–35 per m², and spray foam costs SAR 20–45 per m². Where insulation is also wanted, XPS boards cost SAR 12–30 per m². The right option depends on the roof's condition, how much movement it shows, and whether the surface will be walked on or left bare.

Before the visit, ask the provider to walk the roof with you and point out every crack and drain, and to explain which system they recommend and why. Ask for a written quote that lists the area in square metres and the length of any crack work in metres, so you can compare it with the ranges above. Confirm what surface preparation is included, how long the work will take, and whether the warranty covers the coating and the crack repairs. Asking these questions early, ideally before summer heat and the rain season arrive, gives you time to fix problems while the roof is still dry enough to work on properly.

Checks before summer and before the rain season catch problems while they are still small.

Signs worth paying attention to

These are the signs most often linked to roof waterproofing:

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

Where the problem usually comes from

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

Tools we use in Jazan

The steps in order

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

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

What you get after the work

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.