1.1.5-1
Basement retaining wall
Component Information
- Code:
- 1.1.5-1
- Sequence:
- 1
- Unit:
- m/m2
- Sub-Element:
- 1.1.5 - 5 Basement retaining walls
Basement retaining wall
details to be stated
Component Statistics
Measurement Rules
Included Items
Excluded Items
Measurement Rules (8)
Where the area of the basement retaining wall is to be measured, the area measured is the surface area of the exposed face of the retaining wall.
The height of the basement retaining wall should be measured from the top of the base slab/bed or the top of the basement retaining wall base/toe to the level at which the basement retaining wall connects with the external wall above ground (i.e. the level at which the external wall changes from being a retaining wall to a non-retaining wall).
Where the length of the basement retaining wall is to be measured, the length of the basement wall should be measured on the centre line.
Where more than one type of retaining wall construction is employed, each type of retaining wall construction is to be stated separately.
Other cost-significant components are to be described and identified separately. Such components are to be measured by area (m2) or linear measurement (m), or enumerated (nr) separately.
Curved work is to be described and identified separately.
Work within existing buildings is to be described and identified separately.
Where the contractor is only responsible for designing specific elements and/or components of the building project (i.e. not the entire building project), contractor-designed work is to be described and identified separately.
Included Items (13)
Concrete retaining walls, including concrete, reinforcement, formwork and excavating and backfilling working space required to facilitate construction of retaining walls.
Embedded retaining walls.
Specialist concrete grades, such as waterproof concrete.
Trench excavations for bases/toes to basement retaining walls that commence below the level from which the construction of the basement base slab is to commence.
Disposal of excavated material, including tipping charges and landfill tax (including inert, non-hazardous and hazardous material where not to be carried out as facilitating works).
Note: where no contamination/remediation strategy report exists, an allowance is to be made within the construction risk allowance for the extra cost of disposing of contaminated material.Fixings cast into/fixed to concrete retaining walls to retain masonry facing wall (e.g. brickwork, blockwork and stonework facing wall).
Masonry walls (e.g. brickwork, blockwork and stonework) forming an integral part of the basement retaining wall construction, including where used for the purpose of concealment (external and internal skins) as well as reinforcement and design joints.
Waterproof tanking to walls.
Applied protection to external tanking (e.g. protection boards).
Thermal insulation, damp-proof membranes, vapour barriers, etc.
Groundwater pressure relief drains to basements and retaining walls connected to the drainage system (i.e. fin drains, filter drains and blanket drains) to soil connection.
Sundry items associated with the construction of basement retaining walls.
Where works are to be carried out by a subcontractor, the subcontractor’s preliminaries, design fees, risk allowance, overheads and profit, with allowance for these to be made within unit rate applied to element or component.
Excluded Items (6)
External basement walls not in contact with earthwork (i.e. non-retaining walls – included in sub-element 2.5.2).
Bulk excavation to form basements (included in sub-element 1.1.4).
Additional excavation required to facilitate construction of basement retaining walls (e.g. where open excavation method is employed – included in sub-element 1.1.4).
Applied finishes to inner faces of external walls (included in element 3.1).
Retaining walls not providing external walls to building (i.e. that form part of the external works – included in sub-element 8.4.3).
Drainage beyond soil connection (included in sub-elements 1.1.3 or 8.6.1, as appropriate).
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