Roof waterproofing for duplexes in Alqunfudhah

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

Roof waterproofing in Alqunfudhah: the local context

Team note on Alqunfudhah: 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 Alqunfudhah sits about 7 m above sea level (SRTM open elevation data).

Alqunfudhah is about 0.4 km from the sea coast (OpenStreetMap).

Do duplex roofs in Alqunfudhah really need waterproofing, given how close the town sits to the coast? The centre of Alqunfudhah sits about 7 m above sea level, and the town is about 0.4 km from the sea coast. That combination of low elevation and nearby salt air means roofs here are exposed to moisture and salt-laden weather, so a sound waterproofing layer protects the slab and the rooms beneath it. For a duplex, a leak from the roof affects two households, which is why many owners plan this work before damage shows up inside.

Once a visit is booked, the inspection usually starts with a walk across the whole roof to look for cracks, ponding areas, and failed sealant at parapets, drains and roof penetrations. Cracks are measured in metres, since crack injection is priced per metre at SAR 40–120 per m, so the inspector will mark each line and note its length. The surface is then assessed to decide the system: liquid roof waterproofing is quoted at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and spray foam at SAR 20–45 per m², with XPS boards at SAR 12–30 per m² where insulation is also wanted. The inspector records the roof area in square metres so each option can be compared on the same basis.

Before the inspector arrives, gather the building's details and clear the roof where you can. Have the total roof area of both units to hand, noting any separate sections or stairwell roofs. Tell the team about any past leaks, the rooms affected, and whether a water tank sits on the roof, because tank internal coating is priced separately at SAR 25–60 per m². Remove loose items, planters and satellite brackets from the surface, and make sure access hatches and the roof door are unlocked. Clear notes on these points let the visit focus on the work itself and give you a clearer written estimate.

In a duplex, the two floors often share lines, so tests are done floor by floor.

When do you need roof waterproofing?

These are the signs most often linked to roof waterproofing:

• The old waterproofing is cracking
• Stains on the top-floor ceiling after rain
• Water pooling on the roof

Causes we see in the field

• Cracks in the roof slab.
• Damaged waterproofing around tank and AC bases — we check this before anything else.
• Wrong falls towards the drains — we check this before anything else.

Tools we use in Alqunfudhah

The steps in order

1. Survey: Falls, drains and the condition of the old layer are recorded.
2. Preparation: Cleaning and repairs before any new layer.
3. Primer: The base coat that the system needs.
4. Waterproofing layers and details: Corners, upstands and bases get their own detail.
5. Flood test: The roof is flooded and checked before it is covered.

Quick comparison: facts and costs in Alqunfudhah

Questions from Alqunfudhah

What we advise against

• Covering the waterproofing before the flood test
• Ignoring the tank bases

What you receive

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