Bitumen membrane for residential buildings in Alnuayriyah

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

Bitumen membrane in Alnuayriyah: the local context

Team note on Alnuayriyah: 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 Alnuayriyah sits about 49 m above sea level (SRTM open elevation data).

Main roads in or near Alnuayriyah: King Abdulaziz Road.

Bitumen membrane work in Alnuayriyah starts with the elevation, because the centre of the town sits about 49 m above sea level according to SRTM open elevation data. That height matters less for the membrane itself than for how water moves across a roof and down a site, so the first check is the drainage path: where rainwater leaves the roof, whether outlets and gutters are clear, and whether any low corner could hold water against the membrane. Given the fixed height of the town, the technician should confirm the falls on each roof plane before anything else, since a membrane laid over a poor slope will fail at the same spot repeatedly.

Several things are left to the site visit and cannot be settled from a description. The condition of the existing surface, including any cracks, blisters or loose laps, has to be seen in person. The same applies to parapets, upstands, pipe penetrations and the junction where the roof meets the walls. Bitumen membrane for a roof is priced at SAR 15–35 per m², but the final figure depends on the area measured on site and the number of details that need extra work. If the building also has a basement, bathroom or water tank, those are priced separately at SAR 50–150 per m² for basement waterproofing, SAR 15–40 per m² for bathroom waterproofing and SAR 25–60 per m² for tank internal coating, and the visit is the moment to confirm which of these apply.

To help the technician prepare, it is useful to have the roof area in square metres, a note of how many storeys the building has, and any photographs of past leaks or repairs. Knowing whether the roof is used for water tanks, air conditioning units or a rooftop gathering space also changes the layout of the membrane and the protection it needs. Bring details of any previous waterproofing so the old layer can be identified. Where crack repairs are needed, the cost of crack injection runs at SAR 40–120 per metre, so measuring the length of visible cracks beforehand gives a clearer picture. Clear access to the roof and a safe route for materials will also keep the visit efficient.

For a residential building, shared risers, tanks and pumps are checked as one system.

Signs that call for bitumen membrane

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

• A flat concrete roof that needs waterproofing
• Old rolls that are cracking

The most common causes

• No protection layer.
• A common cause: seams that were not welded properly.

How we choose the tool in Alnuayriyah

How the work is done, step by step

1. Preparation: Cleaning, priming and repairs.
2. Torch welding: Overlaps are welded and checked.
3. Details: Upstands, drains and bases.
4. Protection and flood test: Protection is laid after a successful flood test.

Quick comparison: facts and costs in Alnuayriyah

Common questions about bitumen membrane in Alnuayriyah

What we advise against

• Leaving the membrane exposed without protection

The written outputs

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