Bitumen membrane for residential buildings in Aljumum

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

Bitumen membrane in Aljumum: the local context

Team note on Aljumum: 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 Aljumum sits about 200 m above sea level (SRTM open elevation data).

Bitumen membrane work in Aljumum starts with the roof and the slab, because the membrane is the first line of defence against water. The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data), so the local ground is not a low-lying basin where water collects, but that elevation does not remove the need to check drainage, falls and outlets on each roof before any membrane goes down. The first checks are the state of the existing surface, any cracks or open joints, and whether the roof drains freely toward its outlets. A bitumen membrane for residential roofs typically falls within SAR 15–35 per m², so a clear picture of the area and condition is needed before a quote is set.

Several points are left to the site visit, because they depend on the building in front of the technician. These include the age and condition of the existing waterproofing, whether a previous layer must be stripped, the state of parapets and upstands, and the position of pipes, vents and roof access points. The visit is also the time to decide whether the roof alone needs work or whether related areas such as a bathroom or a basement need separate treatment. For example, basement waterproofing is priced separately at SAR 50–150 per m², and bathroom waterproofing at SAR 15–40 per m², so the scope of each should be confirmed on site rather than assumed. Crack injection, priced at SAR 40–120 per metre, is also judged in person, since the length and depth of each crack can only be measured once the surface is open.

For the technician, the useful information is a clear record of the roof's dimensions, the number and position of outlets, and any areas where water has already entered the rooms below. Photographs of cracks, stains and failed joints help the team plan materials before arriving. Note any tank or XPS insulation on the roof, since these affect the order of work. Record the access route, the times the household is available, and any furniture or rooftop equipment that must be moved. Good notes at this stage let the crew carry the right materials, price the job against the rates above, and avoid returning to the site for avoidable reasons.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

Signs that call for bitumen membrane

The following signs are worth checking before they grow:

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

The most common causes

• Seams that were not welded properly.
• No protection layer.

How we choose the tool in Aljumum

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 Aljumum

Questions from Aljumum

Common mistakes we see

• 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.