Roof waterproofing for rest houses & farms in Jubail

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

Why roof waterproofing differs in Jubail

Team note on Jubail: 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.. Jubail is about 0.9 km from the sea coast (OpenStreetMap).

The centre of Jubail sits about 4 m above sea level (SRTM open elevation data).

Jubail sits close to the Gulf coast, with the centre about 4 m above sea level and the sea roughly 0.9 km away. That combination matters for roofs. Salt-laden air drifts inland and settles on surfaces, and low-lying ground means rainwater has little natural fall, so it can pool on flat roofs for longer. For rest houses and farms here, the surface needs to shed water quickly and resist salt-driven wear, which shapes how we prepare and select materials for each job.

Because the coast is close and the land is flat, we start every roof with a careful check of drainage outlets, upstands and existing coatings before choosing a system. Liquid roof waterproofing, priced at SAR 8–25 per m², suits broad, lightly trafficked roof areas and can be applied in a seamless layer that follows the slope to the outlets. Bitumen membrane, at SAR 15–35 per m², offers a heavier layer for roofs that see more foot traffic or water standing after storms. Where thermal comfort is a concern, XPS boards at SAR 12–30 per m² can be added beneath the waterproofing to reduce heat transfer into the rooms below, which is useful in the strong summer sun.

Owners often make the same few mistakes, and our approach is designed to avoid them. Many apply a coating over cracks without first injecting or sealing them, and crack injection, at SAR 40–120 per metre, is a far cheaper step than repairing water damage later. Others skip cleaning off salt and dust, which stops coatings from bonding. Some also choose the lowest-cost option without checking whether it suits the roof's use, leaving a thin layer that wears through within a season. Finally, many leave outlets blocked or ignore the falls, so water keeps finding the same weak point. Planning the system around the site's real conditions avoids these problems.

Rest houses and farms often have long buried lines, tanks and irrigation that need separate tests.

Signs worth paying attention to

These are the signs most often linked to roof waterproofing:

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

The most common causes

• A common cause: cracks in the roof slab.
• A common cause: wrong falls towards the drains.
• Damaged waterproofing around tank and AC bases — we check this before anything else.

Tools we use in Jubail

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.

Facts and costs — Jubail

Questions from Jubail

Common mistakes we see

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

What you receive

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