Roof waterproofing in Unaizah: without breaking

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

Before we start: what we know about 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).

Roof waterproofing in Unaizah most often fails at the joints and parapets rather than in the open roof field. Water finds its way through small cracks where the roof meets walls, around drainage outlets, and along the edges of old sealant. By the time damp shows on a ceiling inside, the leak has usually been travelling for some time. For this reason, a sound job starts with a careful look at the detailing, not just a fresh coat over the whole surface.

Unaizah sits at about 667 m above sea level, which shapes how we approach the work. At this elevation the area experiences marked temperature swings between day and night, and those swings make roof surfaces expand and contract. A rigid coating that suits a flat, stable substrate may crack under that movement. That is why the choice of system matters here. Liquid roof waterproofing, typically priced at SAR 10–25 per m², and bitumen membrane, at SAR 15–35 per m², are both options we weigh against the age and condition of the roof. Spray foam, at SAR 20–45 per m², can suit roofs where a seamless, flexible layer is needed. Where a specific crack runs through the slab, crack injection at SAR 40–115 per metre can seal it from within before any surface layer goes on.

Before the visit, ask the provider to explain how they will assess the roof's joints, parapets and outlets, and whether they will test for the source of any leak rather than only treating the visible stain. Ask which system they recommend and why it suits your roof, and request a written breakdown by area and by item so you can compare the figures against the ranges above. Confirm whether surface preparation is included, how long the work will keep the roof out of use, and what the aftercare steps are. A clear, specific answer to these questions is a good sign of a careful approach.

The aim is to locate the cause with instruments first, so any opening is limited to one point.

When do you need roof waterproofing?

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

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

How we choose the tool in Unaizah

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.

Unaizah in facts and sources

Questions from Unaizah

What we advise against

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

What you receive

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.