Bitumen membrane for restaurants in Najran

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

Why bitumen membrane differs in Najran

The centre of Najran sits about 1309 m above sea level (SRTM open elevation data). Main roads in or near Najran: Al Jarba Street.

Team note on Najran: 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..

Bitumen membrane work for restaurants in Najran starts with the roof and the parts of the building that take the most water. The centre of Najran sits about 1309 m above sea level (SRTM open elevation data), and that height is one reason the technician looks first at how the roof falls and drains rather than assuming a flat surface will shed rain on its own. Before any price is discussed, the first check is the roof slab, the upstands at parapets and the outlets, because these are where a bitumen membrane usually fails in a commercial kitchen with heavy plant and frequent foot traffic. Bitumen membrane is priced at SAR 15–35 per m², and the final figure depends on what the visit reveals about the substrate.

Several points are deliberately left to the site visit. The technician needs to see the existing layers, whether an old membrane can stay in place or must be removed, and how the drainage and rooftop equipment are arranged. Cracks are checked on the spot as well: crack injection is costed at SAR 40–120 per metre, so the length and condition of any cracking changes the estimate considerably. If the restaurant has a rooftop tank, its internal coating is priced separately at SAR 25–60 per m², and the tank is inspected rather than assumed. Where insulation is part of the plan, XPS boards at SAR 12–30 per m² are considered only after the roof's condition is confirmed. Access, working hours around service times, and the condition of the walls below the roof line are also reviewed in person.

To help the technician arrive prepared, it is useful to have the restaurant's roof plan or a rough sketch with the dimensions, the number and position of drains, and any areas where equipment is fixed to the roof. Note any past leaks, including where water appeared inside the kitchen or dining area and after which kind of rain. Mention whether the roof is used for storage, extraction units or seating, since this affects how the membrane is protected. Tell the technician which other waterproofing works you have already had done, such as bathroom or basement treatments, so that the scope can be matched to what already exists. With this information ready, the visit can focus on confirming the roof and deciding the right system for your restaurant in Najran.

For restaurants, visits are planned outside service hours and recorded for the premises file.

Signs that call for bitumen membrane

The following signs are worth checking before they grow:

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

Where the problem usually comes from

• No protection layer.
• Seams that were not welded properly — we check this before anything else.

How we choose the tool in Najran

The steps in order

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.

Facts and costs — Najran

Questions from Najran

Common mistakes we see

• Leaving the membrane exposed without protection

What you get after the work

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