Roof thermal insulation for duplexes in Jubail

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

Why roof thermal insulation differs in Jubail

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).

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 sits about 4 m above sea level, and the coast is roughly 0.9 km away, so the first thing we check on a duplex roof is how exposed it is to salt-laden sea air and wind. Both affect how quickly insulation and surface coatings wear, and they shape which materials suit the roof. Before any measurement is taken, the technician looks at the roof's general condition, the parapet and drainage points, and any signs of moisture or past repairs, because these determine whether the insulation can be applied directly or needs preparation first.

Several points can only be settled at the site visit. The actual roof area and its slope, the state of the existing surface, the presence of cracks or ponding water, and access for the work crew all depend on what is physically on the roof on the day. Cost also depends on the scope the technician confirms there. Rates are commonly quoted per square metre, for example liquid roof waterproofing at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m², but the choice between these and the final figure can only be fixed once the roof has been inspected. Crack injection, priced at SAR 40–120 per metre, is likewise assessed on the spot, since the length of cracking is not known until the surface is walked.

To help the technician, it is useful to have the duplex's roof plans or rough sketch, the year the building was completed, and a note of any leaks, damp patches or previous roof work. Photos of the roof surface and the inside ceiling under the roof are also helpful. Please mention whether the roof is used for water tanks, rooftop equipment or as a living space, since a tank internal coating (SAR 25–60 per m²) or a walkable surface changes the approach. Clear access routes and the times when the household is available make the visit quicker and the assessment more accurate.

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

Signs worth paying attention to

The following signs are worth checking before they grow:

• The AC runs for long hours in summer
• Strong heat on the top floor
• The ceiling stays hot at night

Causes we see in the field

• No thermal insulation under the roof protection — we check this before anything else.
• A common cause: old insulation that has deteriorated.

Tools we use in Jubail

From the first visit to the report

1. Thermal survey: Hot areas of the roof are mapped.
2. Choosing the system: The material and thickness are agreed in the quote.
3. Installation: The layer is installed and protected.
4. Measurement and documentation: Thickness is measured at spread-out points.

Facts and costs — Jubail

Common questions about roof thermal insulation in Jubail

What we advise against

• Relying on reflective paint alone on an uninsulated roof

The written outputs

The written output: the documented thickness, materials and batch numbers. The report is numbered and can be checked with its verification code.