Roof waterproofing for residential buildings in Alaridah

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

Before we start: what we know about Alaridah

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

Alaridah sits at roughly 2591 m above sea level, which places it among the higher inhabited areas where residents notice cooler nights and stronger temperature swings between day and evening. For a roof, that matters. Large daily temperature changes make the surface expand and contract, which stresses seams, parapets and the joints where the membrane meets walls and drains. A waterproofing system here has to stay flexible enough to move with the structure rather than crack and let water in.

Because of this altitude-driven movement, the choice of system is closely tied to the roof's condition and layout. Liquid roof waterproofing, priced at SAR 8–25 per m², is well suited to flat residential roofs with many small upstands and awkward corners, since it can be applied seamlessly around pipes and edges. Bitumen membrane, at SAR 15–35 per m², gives a thicker, more protective layer for roofs that see heavy foot traffic or rooftop tanks. Where thermal comfort is a concern for upper floors, XPS boards at SAR 12–30 per m² add insulation alongside the waterproofing, which helps reduce the heat that rises through the slab during the warmer parts of the year. Spray foam, at SAR 20–45 per m², is another option for irregular surfaces, and crack injection, at SAR 40–120 per metre, is used to seal specific cracks before any wider coating goes on.

Owners in Alaridah often avoid the same few problems by planning ahead. Many do not ask for a full inspection before choosing a system, so a coating is applied over an existing crack that then reopens. Others compare only the price per square metre and overlook the cost of preparing the surface or repairing edges. Some leave rooftop water tanks uncoated inside, even though tank internal coating at SAR 25–60 per m² protects the water supply. Requesting a clear written scope that covers surface preparation, crack repair, and the drainage points before work begins is the simplest way to avoid these mistakes.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

When do you need roof waterproofing?

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

Tools we use in Alaridah

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.

Facts and costs — Alaridah

Short answers for Alaridah

Common mistakes we see

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

What you receive

You receive: a quality record with photos and the flood-test result, in a technical report with a verification code.