Roof waterproofing for restaurants in Alwajh

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

Why roof waterproofing differs in Alwajh

Alwajh is about 0.7 km from the sea coast (OpenStreetMap). The centre of Alwajh sits about 19 m above sea level (SRTM open elevation data).

Team note on Alwajh: 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..

Will salt air and heat from the coast wear out a restaurant roof faster in Alwajh? The centre of Alwajh sits about 19 m above sea level, and the town is about 0.7 km from the sea coast. That closeness to the water means a rooftop here is exposed to moist sea air, so a restaurant owner should treat the roof membrane as something that needs regular attention rather than an occasional repair. Several waterproofing options are priced for this work, including liquid roof waterproofing at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², spray foam at SAR 20–45 per m², and XPS boards at SAR 12–30 per m². Crack injection, priced at SAR 40–120 per metre, is often the right first step where leaks trace back to a single split in the surface.

A useful inspection starts at the roof edges and drains, where water collects first, and works across the whole surface. The inspector looks for blistering, lifted seams, cracks and ponding, then checks the junctions around vents, ducts and parapet walls where kitchen exhaust and air-conditioning units are mounted. Restaurant roofs often carry heavier equipment and more foot traffic than homes, so the inspector also notes where the membrane has been scuffed or punctured. Each finding is recorded by area in square metres or by length in metres, which is how the options above are quoted. The result is a clear picture of whether a spot repair will hold or whether the whole roof needs a new layer.

Before the visit, gather a few details so the inspection can move quickly. Note the roof area and the length of any visible cracks, and tell the inspector when leaks appear, such as during heavy rain or after kitchen hours when steam rises. Share any past repair records and the year the roof membrane was last replaced, and clear access to the roof hatch and equipment so the team can reach every edge. If the restaurant shares a building with other units, let the building manager know in advance. With these details ready, the site visit can focus on the roof itself and the options that fit its condition.

For restaurants, visits are planned outside service hours and recorded for the premises file.

Signs worth paying attention to

The following signs are worth checking before they grow:

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

Tools and methods, and when we use them

From the first visit to the report

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 Alwajh

Common questions about roof waterproofing in Alwajh

What we advise against

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

What you get after the work

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