Roof waterproofing for schools in Alzulfi

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

Before we start: what we know about Alzulfi

Team note on Alzulfi: 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 Alzulfi sits about 615 m above sea level (SRTM open elevation data).

Main roads in or near Alzulfi: King Fahd Road, Sheikh Ibn Baz Square, King Salman Road.

At a school roof in Alzulfi, the first thing a technician checks is the altitude, because it shapes how the roof is exposed. The centre of Alzulfi sits about 615 m above sea level (SRTM open elevation data), which places the site in a high, inland setting where roofs can be open to strong sun and wide temperature swings between day and night. That exposure is why the first look is at the existing surface and its ability to handle heat expansion. Liquid roof waterproofing is priced at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m², so the first question is which system suits the roof already in place and how much area it covers.

Other points are left to the site visit, because they cannot be judged from a desk. The technician needs to see the actual condition of the roof: whether there are cracks, where water is pooling, and whether the old coating has lifted or blistered. Crack injection is charged at SAR 40–120 per metre, so the length of any cracks found on the day will decide the scope. Where water is collecting on a flat roof, the technician will note the drainage routes, outlets, and any parapet or wall junctions that need separate attention. Nothing in this list can be fixed by a price alone, so the final scope is confirmed only after inspection.

Some details help the technician prepare before arriving. Please note the roof area in square metres, any sections that are already leaking, and whether the building includes a water tank, since tank internal coating is priced at SAR 25–60 per m². If a spray foam or epoxy coating has been used before, say so, because the old layer affects adhesion. Access arrangements matter too, so tell the team when the roof can be reached safely and when classes are not in session. The clearer the information at the start, the more accurate the site visit and the quote will be.

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

Signs that call for roof waterproofing

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

Tools we use in Alzulfi

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.

Quick comparison: facts and costs in Alzulfi

Short answers for Alzulfi

Mistakes that cost more

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

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.