Roof thermal insulation for duplexes in Aljumum

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

Why roof thermal insulation differs in Aljumum

Team note on Aljumum: 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 Aljumum sits about 200 m above sea level (SRTM open elevation data).

Aljumum sits at roughly 200 m above sea level, according to SRTM open elevation data, and that elevation shapes how roofs here behave. Sites at this height see strong daytime sun on exposed surfaces and cooler nights than the coast, so a roof takes heat in quickly and gives it up in the evening. For duplex owners, this means the upper floor often feels the most heat gain, and the roof is the first place to look when rooms stay warm after dark.

Because of this heat pattern, roof thermal insulation is usually the most practical upgrade for a duplex in Aljumum. The service works on the roof deck and the membrane beneath it, and pricing can be understood through the materials involved. Extruded polystyrene boards, listed at SAR 12–30 per m², are a common choice for the insulating layer, while liquid roof waterproofing at SAR 8–25 per m² and bitumen membrane at SAR 15–35 per m² are used to seal the surface. Spray foam, at SAR 20–45 per m², is another option when the roof shape makes boards difficult to fit. Crack injection, at SAR 40–120 per metre, is often needed first where older roofs have split, so that heat and water cannot pass through the gaps.

Owners in Aljumum tend to avoid several common mistakes. The first is insulating a roof that still leaks, which wastes the insulation and hides the damage until it spreads into the top floor. The second is comparing quotes only by price per square metre without checking whether the layers, cracks and edges are included. The third is ignoring the parapets and roof edges, where heat escapes quickly. The fourth is choosing a sealant that does not suit the sun exposure at this height. Owners who inspect the roof first, seal cracks, then add insulation and a suitable membrane usually get the most comfortable upper floor for their money.

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

When do you need roof thermal insulation?

If you notice one of these signs in Aljumum, it is a good moment to talk to the team:

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

The most common causes

• No thermal insulation under the roof protection — we check this before anything else.
• Old insulation that has deteriorated.

Tools we use in Aljumum

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.

Quick comparison: facts and costs in Aljumum

Questions from Aljumum

Mistakes that cost more

• Relying on reflective paint alone on an uninsulated roof

What you receive

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