Basement & foundation waterproofing for restaurants in Unaizah

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

Why basement & foundation waterproofing differs in Unaizah

Team note on Unaizah: 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 Unaizah sits about 667 m above sea level (SRTM open elevation data).

The centre of Unaizah sits about 667 m above sea level, which places the town on a plateau in the Qassim region rather than in a low valley. For a restaurant owner, this elevation matters less for drainage than for the nature of rainfall and ground moisture. Storms that reach the town can arrive quickly and drain across sloped surfaces toward lower-lying service yards and access ramps, so the water a basement must resist often comes from surface runoff pooling against exterior walls rather than from a rising water table. We therefore look at how water moves around the building before choosing a system.

Each of our price ranges reflects a practical difference in the work. Basement waterproofing is priced at SAR 50–145 per m², because below-grade walls and floors must hold back water pressure continuously, and the final figure depends on access and wall condition. Crack injection, at SAR 40–115 per metre, suits a restaurant where a single hairline fault is the likely source of seepage and the rest of the structure is sound. Liquid roof waterproofing at SAR 10–25 per m² and bitumen membrane at SAR 15–35 per m² protect exposed roof slabs that take direct sun and rain. Tank internal coating at SAR 25–55 per m² protects water storage used in kitchens and washing, and epoxy coating at SAR 35–85 per m² gives kitchen floors and back-of-house areas a surface that tolerates grease and frequent cleaning. Spray foam at SAR 20–45 per m² and XPS boards at SAR 10–30 per m² are options where insulation and moisture control are needed together.

Owners who avoid the most common problems tend to share a few habits. They do not treat a damp patch as a cosmetic issue and wait, because moisture spreads behind finishes and into electrical runs. They do not apply a coating to a surface that is still dusty, oily or wet, since adhesion fails first. They do not choose the cheapest per-metre figure without checking which areas the quote covers, and they do not skip repairing cracks before waterproofing the surface above them. Finally, they schedule work outside peak service hours so the kitchen can keep operating while the basement and yard are sealed.

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

When do you need basement & foundation waterproofing?

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

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

The most common causes

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

How we choose the tool in Unaizah

How the work is done, step by step

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.

Facts and costs — Unaizah

Short answers for Unaizah

What we advise against

• Painting the basement wall while the water comes from outside

What you get after the work

You receive: the source, the treatment and the follow-up result, in a technical report with a verification code.