Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A retaining wall is a reinforced concrete wall that holds soil on one side, such as basement walls or level changes on site. It is designed for soil and groundwater pressure and is usually thicker at the base.
Why it matters on a project
Its failure is dangerous and costly, and basement leaks through it are among the most common complaints after handover. It needs structural design, waterproofing and drainage behind it.
Measurement and pricing
Concrete in cubic metres, steel in tonnes, waterproofing on the soil face in square metres and backfill behind it in cubic metres.
Common mistake
Backfilling before the concrete gains strength or without a drainage layer and perforated pipe, so pressure builds and cracks and seepage appear.
Frequently asked questions
What is a typical basement wall thickness?
In villas usually 25 to 40 cm depending on depth and soil pressure, set by the structural design.
Is waterproofing the wall from inside enough?
No, effective waterproofing is on the soil face with protection and drainage; internal waterproofing is a limited remedial fix.
Related terms
- WaterproofingLayers preventing water ingress into structural elements or spaces, such as bituminous membranes and cementitious coatings.
- BackfillRefilling excavations around foundations with suitable soil in compacted layers.
- Raft foundationA single reinforced concrete slab foundation under the whole building.
- Reinforced concreteConcrete containing steel reinforcement to resist the tensile forces concrete alone cannot carry.
Read next
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