Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Bitumen membrane is polymer-modified bitumen waterproofing in rolls, usually 4 mm thick, torch-bonded over a primer with about 10 cm laps. It is used on roofs, foundations, basements and wet areas.
Why it matters on a project
It is the most common roof and foundation waterproofing in Saudi Arabia, and correct work at corners and pipe penetrations decides whether water leaks years later.
Measurement and pricing
Per square metre including primer, laps and upturns on walls, with the protection layer separate or included per the item description.
Common mistake
Leaving the membrane exposed to sun or walking on it without protection, or skipping the flood test before covering.
Frequently asked questions
What is a flood test?
Covering the waterproofed roof with water for about 48 hours to confirm no leaks before protection layers go on.
Is one layer enough?
On most roofs one 4 mm layer with correct details; some specifications call for two.
Related terms
- WaterproofingLayers preventing water ingress into structural elements or spaces, such as bituminous membranes and cementitious coatings.
- Thermal insulationMaterials reducing heat transfer through walls and roofs, required by the Saudi Building Code.
- Floor screedA thin mortar or concrete layer that levels the floor before tiles or parquet.
- Retaining wallA wall designed to hold back soil on one side.
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