Roof thermal insulation for duplexes in Al Aqyq, Riyadh

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

Before we start: what we know about Al Aqyq

The centre of Al Aqyq is at 24.7740, 46.6309, about 8.1 km from the centre of Riyadh, with an approximate radius of 2.8 km. The approximate area shown on the map is centred here. The centre of Al Aqyq sits about 647 m above sea level (SRTM open elevation data).

The nearest wadi channel is about 0.7 km from the centre of Al Aqyq (OpenStreetMap). Main roads in or near Al Aqyq: King Fahd Road, Northern Ring Road, Prince Mohammed bin Salman bin Abdulaziz Road.

Imagine a family who owns a duplex in Al Aqyq, with two households sharing one building and one flat roof that takes the full force of the afternoon sun. By mid-afternoon the upper floor feels like an oven, the air conditioners run hard late into the night, and the electricity bill keeps climbing. The owner wants the roof to stop passing heat into the rooms below, but does not want to disrupt the tenant upstairs or spend money on the wrong fix.

Al Aqyq sits at about 24.7740, 46.6309, roughly 8.1 km from the centre of Riyadh, with an approximate radius of 2.8 km. The centre of the district is about 647 m above sea level, which means its nights can be cooler than the city centre but its daytime sun is still intense. The nearest wadi channel lies about 0.7 km from the centre, so rainwater can run off quickly after a storm and the roof drainage needs to be clear. For a duplex, these local conditions point to two priorities: insulation that handles strong heat gain, and a waterproof layer that sheds water rather than letting it pool. Cost also matters, so it helps to know the typical range for each material before choosing.

Start by inspecting the roof surface for cracks, ponding spots and failed sealant, and check that the drains and outlets are clear. Next, decide the insulation approach: XPS boards, at SAR 15–30 per m², give a firm thermal layer, while spray foam, at SAR 20–45 per m², can seal awkward shapes and joints. Then choose a waterproof finish. Liquid roof waterproofing costs SAR 10–25 per m² and suits a broad flat surface, while a bitumen membrane at SAR 15–35 per m² offers a heavier layer. Repair any cracks first with crack injection, which runs SAR 40–125 per metre. Finally, ask for a written quantity for each roof area, confirm the materials and their per-m² rates, and plan the work so that both households know when the roof will be in use.

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

Signs that call for roof thermal insulation

These are the signs most often linked to roof thermal insulation:

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

The most common causes

• A common cause: old insulation that has deteriorated.
• No thermal insulation under the roof protection.

How we choose the tool in Al Aqyq

How the work is done, step by step

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 — Al Aqyq

Common questions about roof thermal insulation in Al Aqyq

Common mistakes we see

• Relying on reflective paint alone on an uninsulated roof

What you receive

You receive: the documented thickness, materials and batch numbers, in a technical report with a verification code.