Roof waterproofing for villas in Unaizah

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

What is specific about Unaizah for roof waterproofing

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 villa owner in Unaizah who has noticed a damp patch on the ceiling of an upper room after the last rainy spell. The house is a few years old, the roof is flat and used for drying laundry and storing a water tank, and the owner wants the problem fixed before it spreads into the walls. Like many homeowners here, they are weighing up several options and want a clear picture of what the work involves before anyone starts on the roof.

The local setting matters. The centre of Unaizah sits about 667 m above sea level, which places the town on the plateau of Al-Qassim. For a roof, this means the surface is exposed to strong sun during the day and sharp temperature swings between day and night. Those swings make the roof expand and contract, which is how small cracks open up over time. For a villa owner, that is a reason to treat the roof as a surface that moves, so the waterproofing system should be flexible enough to follow that movement, and cracks should be sealed early rather than left to grow.

Practical steps for the owner would run in this order. First, walk the roof after rain and mark every crack, bubble and damp spot, and check where the water tank sits, since its base and the pipes around it are common leak points. Second, decide on the system: liquid roof waterproofing typically falls in the range of SAR 10–25 per m², bitumen membrane SAR 15–35 per m², and XPS boards SAR 10–30 per m², so compare the coverage, the access to the roof and the finish you want. Third, seal any cracks by crack injection, which runs SAR 40–115 per metre, before applying the chosen layer. Fourth, if the water tank is inside the scope, budget for a tank internal coating at SAR 25–55 per m². Finally, after the work, recheck the roof after the next rainfall and keep a record of the areas treated so future maintenance is quick and clear.

In a villa, tanks, the roof and the yard lines are usually yours to look after, so it helps to know where the main valve and tank hatches are.

When do you need 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.
• Damaged waterproofing around tank and AC bases.
• Wrong falls towards the drains.

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.

Facts and costs — Unaizah

Questions from Unaizah

Common mistakes we see

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

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.