Roof waterproofing for villas in Alaridah

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

Why roof waterproofing differs in Alaridah

The centre of Alaridah sits about 2591 m above sea level (SRTM open elevation data).

Roof waterproofing work in Alaridah starts with the altitude. The centre of Alaridah sits about 2591 m above sea level (SRTM open elevation data), which means a roof here sees wide day-to-night temperature swings and strong sun at height. Those swings make the surface expand and contract, so the first things a technician checks are the existing membrane's condition, any cracks in the screed, and how the surface has moved over time. Liquid roof waterproofing is typically priced at SAR 8–25 per m², while bitumen membrane runs SAR 15–35 per m², so the choice of system is usually made once the roof's condition is known.

Several points are left to the site visit, because they cannot be judged from a description. The technician will look at the slope and whether water is ponding after rain, the state of the drainage outlets and parapets, and the condition of the flashing where the roof meets walls, water tanks and rooftop fixtures. Crack injection, priced at SAR 40–120 per metre, is only chosen after the crack is traced and its movement is understood. Spray foam (SAR 20–45 per m²) and XPS insulation boards (SAR 12–30 per m²) are also decided on site, depending on whether thermal performance is part of the brief. Any rooftop water tank that needs internal work will be assessed separately, since tank internal coating is priced at SAR 25–60 per m².

Information that helps the technician will make the visit faster and the quote more accurate. Note the approximate roof area in square metres, when the roof was last treated, and whether leaks appear after heavy rain, in a particular room, or only in summer. Photographs of the roof surface, the parapets and any visible cracks are useful, as is the location of the water tank and the access route to the roof. Please also say whether the villa has a basement or a bathroom on the roof level, since those areas are priced separately, at SAR 50–150 per m² for basement waterproofing and SAR 15–40 per m² for bathroom waterproofing.

Villas often have several lines and tanks; we test them one at a time so the cause is clear.

When do you need roof waterproofing?

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

• The old waterproofing is cracking
• Stains on the top-floor ceiling after rain
• Water pooling on the roof

Causes we see in the field

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

Tools we use in Alaridah

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 — Alaridah

Common questions about roof waterproofing in Alaridah

What we advise against

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

The written outputs

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.