Roof thermal insulation in Alwajh: cost & published offers

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

Before we start: what we know about Alwajh

Alwajh is about 0.7 km from the sea coast (OpenStreetMap). The centre of Alwajh sits about 19 m above sea level (SRTM open elevation data).

Team note on Alwajh: 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..

What do roof thermal insulation options in Alwajh actually cost, and what do published offers include? Alwajh sits about 19 m above sea level, and its centre is about 0.7 km from the sea coast, so roofs here face a mix of heat and coastal air. The published rates vary by material. Spray foam is listed at SAR 20–45 per m², XPS boards at SAR 12–30 per m², and liquid roof waterproofing at SAR 8–25 per m². Bitumen membrane falls between SAR 15–35 per m². These figures are rates per square metre, so the total depends on the roof area and the material you choose. Read each offer to see whether it covers only the insulation layer or also a waterproofing finish.

The inspection usually starts with a walk over the roof to check its surface, drainage points, and any cracks or areas where water has pooled. The inspector will note the roof's condition and measure its area, since every published rate is calculated per square metre. Where cracks are present, crack injection is priced per metre at SAR 40–120 per m, so the length of each crack is recorded. The inspector will also check the parapet walls and edges where the insulation layer meets the roof structure, and will ask which rooms lie directly beneath the roof, as heat gain is often highest in top-floor spaces.

Before the visit, gather the roof plan or any sketch showing its dimensions, along with the age of the roof and a record of past leaks or repairs. Note any cracks you have seen and roughly where they run, and mark areas where water collects after rain. If there is a water tank on the roof, mention it, because tank internal coating is priced separately at SAR 25–60 per m². Having this information ready lets the inspector give you an accurate, comparable quote in Alwajh.

Prices shown on this page come from our own published price list for the city; the final price is set after inspection.

When do you need roof thermal insulation?

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

Where the problem usually comes from

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

How we choose the tool in Alwajh

The steps in order

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 Alwajh

Common questions about roof thermal insulation in Alwajh

Common mistakes we see

• Relying on reflective paint alone on an uninsulated roof

What you get after the work

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