Roof waterproofing for warehouses in Alrass

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

Before we start: what we know about Alrass

Team note on Alrass: 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.. Main roads in or near Alrass: King Abdulaziz Road, King Fahd Road, King Salman Road.

The centre of Alrass sits about 695 m above sea level (SRTM open elevation data).

Roof waterproofing for warehouses in Alrass most often fails at the seams, outlets and upstands rather than across the open roof field. Large flat or low-pitch warehouse roofs collect standing water after rain, and that water finds its way through laps, fixings and joints where the membrane has been stressed by thermal movement. Leaks usually appear inside the building long after the original work was done, which is why a visual check from below is rarely enough to judge the roof's condition.

Alrass sits about 695 m above sea level, so the site is inland and elevated rather than coastal, and that shapes the approach. Daily temperature swings on exposed roof surfaces are the main stress on the membrane, so the choice of system needs to tolerate expansion and contraction rather than simply shed water. Liquid roof waterproofing, typically priced at SAR 8–25 per m², can be applied seamlessly over irregular roof sheeting and around plant fixings, which suits older warehouse roofs with many penetrations. Bitumen membrane, at SAR 15–35 per m², offers a more traditional layered barrier for roofs that need a robust, continuous sheet. Where thermal performance matters alongside waterproofing, XPS boards at SAR 12–30 per m² add insulation to the build-up. Each option has its place, and the right one depends on the existing roof and how the building is used.

Before arranging a visit, ask the provider which system they recommend for your specific roof and why, and whether they will inspect the seams, outlets and upstands as well as the open field. Request an itemised quotation that shows the area being treated and the rate per m², so you can compare it with the ranges above. Ask how they will handle existing leaks, whether they will check drainage and falls so water does not pond, and what preparation you need to provide, such as clearing access and making the warehouse floor below accessible during work.

For warehouses, work is phased around operations and stored goods.

Signs that call for roof waterproofing

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

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

The most common causes

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

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.

Alrass in facts and sources

Common questions about roof waterproofing in Alrass

Mistakes that cost more

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

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.