Basement & foundation waterproofing for warehouses in Jazan

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

Before we start: what we know about Jazan

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).

Jazan's centre sits about 7 m above sea level, and the coast is only about 1.9 km away, so a warehouse basement here is close enough to the sea for salty, humid ground to matter. Before any quote is given, the first thing checked is the ground condition around the lower walls and slab: whether water sits near the surface, whether there is evidence of past seepage, and how the building drains at ground level. Low-lying ground near the coast can keep moisture in the soil for long periods, so the team looks at this first because it decides which waterproofing system will hold. Basement waterproofing is priced at SAR 50–150 per m², and that range reflects how much of the wall and floor area is affected, so the check starts by measuring the exposed surface accurately.

Several things are left to the site visit, because they cannot be judged from a distance. The technician must see the actual cracks, their length and whether they are moving or dry, since crack injection is priced at SAR 40–120 per metre and the choice depends on what is found. The same visit confirms whether the warehouse floor needs an epoxy coating at SAR 35–90 per m², whether an internal tank or sump needs a coating at SAR 25–60 per m², and whether the roof needs a liquid system at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m². Spray foam (SAR 20–45 per m²) and XPS boards (SAR 12–30 per m²) are also judged on site, depending on access and how the wall is built. Nothing should be chosen until these conditions have been seen in person.

To help the technician prepare, the owner or facility manager should share any earlier drawings, the depth of the basement, records of past water entry, and the times of year when leaks appear. Note which areas are used for storage of goods that are damaged by moisture, and whether the roof is reachable for safe inspection. Bathroom waterproofing at SAR 15–40 per m² is not normally part of a warehouse job, so it should be left out of the scope unless it exists on the same site. Clear information like this lets the technician measure accurately, reduce repeat visits, and give a price that matches the real condition of the building.

For warehouses, work is phased around operations and stored goods.

When do you need basement & foundation waterproofing?

The following signs are worth checking before they grow:

• Water seeping in after rain
• Damp basement walls
• Salt marks at the bottom of the walls

The most common causes

• Cracks at construction joints — we check this before anything else.
• A common cause: rainwater draining towards the foundation.
• A high groundwater level.

Tools and methods, and when we use them

The steps in order

1. Finding the source: Groundwater, rain or a pipe — each needs a different treatment.
2. Preparation: Surfaces are cleaned and opened where needed.
3. Injection: Active cracks are injected.
4. Waterproofing layers: The system is applied on the right side of the wall where possible.
5. Follow-up: Readings are repeated after the treatment.

Quick comparison: facts and costs in Jazan

Short answers for Jazan

Common mistakes we see

• Painting the basement wall while the water comes from outside

What you get after the work

The written output: the source, the treatment and the follow-up result. The report is numbered and can be checked with its verification code.