Roof waterproofing for schools in Alula

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

Why roof waterproofing differs in Alula

Main roads in or near Alula: King Abdullah Road. The centre of Alula sits about 697 m above sea level (SRTM open elevation data).

Roof leaks in school buildings most often start where the roof surface meets walls, parapets, drainage outlets and rooftop service fixtures, because these joints move with heat and are the first places where sealant and membrane fail. In a school, a leak can reach classrooms, storage rooms and corridors quickly, so the timing of repairs matters as much as the choice of material. Liquid roof waterproofing is priced at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and spray foam at SAR 20–45 per m², and each suits different roof conditions. Surveys usually focus first on the drainage outlets and joints, since patching the open field of the roof rarely solves a leak that enters at the edges.

Alula sits about 697 m above sea level, which means the site experiences strong daytime sun, wide temperature swings between day and night, and occasional sharp rainfall that can overwhelm an old drain. Those conditions shorten the life of thin coatings and stress membranes at every seam, so the approach here leans toward materials that tolerate expansion and contraction and toward checking that drains can clear heavy flows. Where a roof has cracks in the substrate, crack injection is priced at SAR 40–120 per metre and is often needed before any surface system is applied. Where a school also has water storage, tank internal coating at SAR 25–60 per m² may be part of the same visit, since shared maintenance access saves disruption to lessons.

Before the visit, ask the provider which roof system they propose and why it suits a roof exposed to this altitude and sun, and request a written breakdown of the area in m² for each section. Confirm whether the quote covers drainage outlets, parapet flashing and any crack repairs, and ask how the work will be scheduled around school hours and the safety of pupils and staff. Ask for a clear description of the prep work, the number of coats or layers, and how the finished surface will be checked. Finally, ask what the school should inspect between visits, so that small defects are reported before they reach classroom ceilings.

For schools, the larger jobs are planned for weekends and holidays.

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

Causes we see in the field

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

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.

Alula in facts and sources

Questions from Alula

Common mistakes we see

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

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.