Bitumen membrane in Baish: with a verifiable technical report

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

Before we start: what we know about Baish

The centre of Baish sits about 84 m above sea level (SRTM open elevation data). Team note on Baish: 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..

Baish sits about 84 m above sea level, a low-lying position in the Jazan region that gives it a warm, humid coastal-adjacent climate. Because the town stands only modestly above sea level, homeowners here often see moisture move through the ground and walls rather than arriving from high ground, so the terrain shapes how water behaves around a building. For bitumen membrane work, this means the first step is always an honest look at the surrounding ground and drainage before any material is laid.

Each feature of the area has a direct effect on the job. A site that is not much above sea level tends to hold water after rain, which puts steady pressure on foundations and basement walls, so the membrane specification has to suit a damp substrate. Bitumen membrane is priced at SAR 15–35 per m², and that range depends on how much preparation the surface needs, including removing loose render, filling cracks and priming. Where crack injection is needed first, it is quoted separately at SAR 40–120 per metre, and it is best done before the membrane goes down so that the sealed layer is not undermined by a moving crack. Roof areas, which are exposed to sun and heavy seasonal downpours, are commonly protected with liquid roof waterproofing at SAR 8–25 per m², while XPS boards at SAR 12–30 per m² can be added where insulation is also needed.

Owners in Baish avoid several common mistakes that undermine membrane work. The first is laying bitumen over a wet or dusty surface, which stops the layer from bonding and invites early lifting. The second is skipping the crack survey, so that a small, unrepaired fault keeps leaking beneath a new membrane. The third is comparing quotes by price alone without checking what each one includes, since a low per-m² figure may leave out priming, detailing at corners and upstands, or the cost of crack injection. Finally, owners avoid ignoring the drainage around the building, because a perfect membrane cannot fully protect a wall that is continually soaked by water running against it.

Each job ends with a written report that carries a verification code you can check on our site.

Signs worth paying attention to

These are the signs most often linked to bitumen membrane:

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

Where the problem usually comes from

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

Tools we use in Baish

From the first visit to the report

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 — Baish

Common questions about bitumen membrane in Baish

Mistakes that cost more

• Leaving the membrane exposed without protection

The written outputs

The written output: photos of the welds and the flood-test result. The report is numbered and can be checked with its verification code.