Bitumen membrane for villas in Jazan

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

Before we start: what we know about Jazan

Jazan is about 1.9 km from the sea coast (OpenStreetMap). The centre of Jazan sits about 7 m above sea level (SRTM open elevation data).

Team note on Jazan: 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..

Before any quote is given for a bitumen membrane on a villa in Jazan, the first check is the location itself. The centre of Jazan sits about 7 m above sea level (SRTM open elevation data), and the city is about 1.9 km from the sea coast (OpenStreetMap). Both facts matter because a roof or podium that is close to the coast and only a few metres above sea level is exposed to salty air and to the moisture that comes with it. The technician therefore looks first at how the roof drains, whether water pools in low corners, and how the membrane meets parapets, drain outlets and rooftop tanks, since these junctions are where leaks usually start.

Several things cannot be settled from a description or a photograph and are left to the site visit. The technician needs to see the existing surface, check for cracks, blistering or old patches, and judge whether the slab is sound enough to take a new membrane. The fall of the roof, the condition of the upstand and the presence of any earlier coating all change the work and the cost. Where a basement or a tank is involved, the same walk-round applies. For reference only, typical rates in this service are a bitumen membrane at SAR 15–35 per m², liquid roof waterproofing at SAR 8–25 per m², and crack injection at SAR 40–120 per metre; the final figure depends on what the visit finds, not on these ranges alone.

Information that helps the technician is simple to prepare in advance. Note the roof area, the number of drains and any rooftop tanks, and whether the villa has a basement or a bathroom on the roof side. Mention any past leaks, the room where water appeared and the time of year it happened. Photos of the roof surface, the parapet and the drain outlets are useful, and so is a note of any access limits such as furniture on the roof, solar panels or a locked gate. Clear answers to these points let the technician arrive with the right materials and reach a firm plan faster.

Villas often have several lines and tanks; we test them one at a time so the cause is clear.

Signs that call for bitumen membrane

These are the signs most often linked to bitumen membrane:

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

Where the problem usually comes from

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

How we choose the tool in Jazan

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.

Quick comparison: facts and costs in Jazan

Questions from Jazan

Mistakes that cost more

• Leaving the membrane exposed without protection

What you receive

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