Roof waterproofing for restaurants in Unaizah

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

Roof waterproofing in Unaizah: the local context

The centre of Unaizah sits about 667 m above sea level (SRTM open elevation data). 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..

Picture a restaurant owner in Unaizah who opens the kitchen one morning to find a dark stain spreading across the ceiling above the prep area. The extractor fans run all day, the cooking heat builds up under the roof, and every rain shower finds a new route through the slab. For someone running a busy dining room, a leaking roof is not a small inconvenience. It threatens food safety, damages equipment and forces the kitchen to close while the repair crew works overhead.

Unaizah sits at about 667 m above sea level, which places the town on the high plateau of Qassim. Sites at this altitude can see a wide daily temperature swing, with the roof surface heating strongly under the sun and then cooling quickly. That repeated expansion and contraction tends to open hairline cracks in concrete and at the edges of parapets, and those cracks are where water finds its way in. For a restaurant, where the roof often carries kitchen exhaust units, ducting and rooftop seating, the sensible response is to treat the roof as a working surface that needs a protective layer, not just a patch.

A practical sequence starts with a full inspection of the roof, the parapet joints and the points where pipes and ducts pass through, so that every crack and failed seal is mapped before any product is chosen. Next, cracks should be sealed by crack injection, priced per metre, so that the structure is stable before the main coating goes on. The main waterproofing layer can then be chosen from the options that suit the roof: liquid roof waterproofing per square metre, a bitumen membrane, or spray foam where a seamless finish is needed. Where extra insulation helps keep the kitchen cooler, XPS boards can be added beneath the protective layer. Finally, the owner should schedule a check after the first heavy rain and plan a light recoating on a regular cycle to keep the roof sealed.

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

Signs that call for roof waterproofing

These are the signs most often linked to roof waterproofing:

• 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 — we check this before anything else.
• Damaged waterproofing around tank and AC bases.
• Wrong falls towards the drains — we check this before anything else.

How we choose the tool in Unaizah

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.

Unaizah in facts and sources

Short answers for Unaizah

Mistakes that cost more

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

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.