Bitumen membrane in Unaizah: preventive periodic check

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

What is specific about Unaizah for bitumen membrane

Team note on Unaizah: 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 Unaizah sits about 667 m above sea level (SRTM open elevation data).

Bitumen membrane work in Unaizah begins with the sheet itself, because a periodic check is about spotting early wear before it becomes a leak. The centre of Unaizah sits about 667 m above sea level (SRTM open elevation data), so the roofs and exposed upper surfaces here are the first place to look for blistering, lifted laps, and surface cracking. Our technician will start by walking the roof and comparing the membrane's condition against the last recorded inspection, noting any ponding water and any place where the membrane has been punctured by fixtures, drains, or foot traffic. Bitumen membrane is priced at SAR 15–35 per m², so the scope of any follow-up repair is usually decided by how much area shows early wear rather than by one isolated spot.

Several things can only be judged on the visit itself. The technician must see how the membrane is bonded at upstands, parapets, and roof edges, where the sheet tends to pull away first. Crack width, the state of any previous patches, and whether a crack is still moving need to be read on site, as does the condition of the flashings around pipes and the outlets that carry water off the roof. Whether a crack calls for a simple sealing job or a fuller intervention is a judgement made with the surface in front of the technician. Where cracks run through structure rather than the membrane alone, crack injection at SAR 40–115 per metre may be considered, but only after the visit confirms the cause. Quotes are given only after that assessment.

To help the technician arrive prepared, residents and property managers should note the date and type of the last waterproofing work, any past leak locations, and whether the roof is used for water tanks, air-conditioning units, or storage, since these loads affect the membrane. Clear access to the roof, the position of any roof hatch, and a note of where water has previously collected all shorten the inspection. Please keep the roof surface free of loose debris before the visit. This information lets the check focus on the areas most likely to fail, making a periodic inspection a practical way to protect the building before water finds its way inside.

Preventive checks follow a written schedule instead of waiting for a fault.

Signs worth paying attention to

The following signs are worth checking before they grow:

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

Where the problem usually comes from

• Seams that were not welded properly.
• A common cause: no protection layer.

Tools we use in Unaizah

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 Unaizah

Questions from Unaizah

Common mistakes we see

• 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.