Bitumen membrane in Aldarb: before summer & rain season

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

Why bitumen membrane differs in Aldarb

The centre of Aldarb sits about 79 m above sea level (SRTM open elevation data). Aldarb is about 18.7 km from the sea coast (OpenStreetMap).

Aldarb sits about 79 m above sea level, and its centre is roughly 18.7 km from the coast. That mix of height and inland position means the first thing we check on a bitumen membrane job is how the roof is draining and where standing water would sit during the rain season. A flat or low-fall roof that holds water for longer gives the membrane more time under load, so we look at outlets, gutters and any dips in the surface before we talk about the membrane itself. Summer heat is the second concern. Bitumen softens when it is hot, so the timing of work and the condition of the existing layer both matter for how well the new sheet bonds.

Some points are left for the site visit, because they depend on what is actually on the roof. The technician needs to see the substrate, whether the old membrane is still sound or has blistered, and where cracks or cut-outs around pipes and parapets need attention. Crack injection is priced per metre and is usually scoped only once the cracks have been mapped. The same applies to the choice between a bitumen membrane and a liquid roof system, which depends on roof access, the number of penetrations and how the roof is used. Pricing for a bitumen membrane runs from SAR 15 to SAR 35 per m², while liquid roof waterproofing runs from SAR 8 to SAR 25 per m², but the final figure only makes sense once the area and condition are confirmed on the roof.

To help the technician, it is worth noting when the roof last leaked, which rooms were affected, and whether any insulation boards such as XPS are already in place beneath the surface. A note on where water collects after rain, a photo of the parapet edges, and any previous repair records will shorten the visit. If there is a water tank on the roof, mention its size and whether its inside has been coated before, since tank internal coating is priced separately at SAR 25 to SAR 60 per m². Clear information at the start lets the visit focus on checking the roof rather than working out the basics.

Checks before summer and before the rain season catch problems while they are still small.

When do you need bitumen membrane?

The following signs are worth checking before they grow:

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

Causes we see in the field

• A common cause: no protection layer.
• Seams that were not welded properly — we check this before anything else.

Tools and methods, and when we use them

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 Aldarb

Common questions about bitumen membrane in Aldarb

What we advise against

• 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.