1.1.3-1
Lowest floor construction
Component Information
- Code:
- 1.1.3-1
- Sequence:
- 1
- Unit:
- m2
- Sub-Element:
- 1.1.3 - 3 Lowest floor construction
Lowest floor construction
details to be stated
Component Statistics
Measurement Rules
Included Items
Excluded Items
Measurement Rules (14)
The area measured is the area of the floor construction measured to the internal face of the external perimeter walls.
The area of the floor construction should be measured in accordance with the rules of measurement for ascertaining the GIFA.
Where more than one type of floor construction is employed, the area measured for each floor construction is the area covered by that floor construction.
The length of retaining walls measured at changes in level is their extreme length, over all obstructions. The height measured is the distance from the top of the slab to the underside of the attached slab.
The area measured for forming swimming pool tanks, etc. is the area of the swimming pool (or other similar facility) on plan, measured to the internal face of the swimming pool walls.
The area measured for forming lift pits, etc. is the area of the lift pit on plan, measured to the internal face of the lift pit.
The length of linear components measured is their extreme length, over all obstructions.
The length of below-ground drainage pipelines measured is their extreme length, over all fittings, branches, etc.
Where components are to be enumerated, the number of components is to be stated.
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 to existing buildings is to be described and identified separately.
The percentage additions for testing and commissioning are to be applied to the total cost of the items comprising the drainage installation. A single combined percentage addition can be applied to cover the costs of both testing and commissioning.
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 (37)
Lowest floor assemblies, such as:• ground slabs/beds • basement slabs/beds • raft foundations • suspended floors serving as lowest floor-level systems, i.e. where void between ground slab/bed under and lowest floor slab (including suspended timber floor construction and precast/composite decking systems).
Thickening to slabs/beds for load-bearing walls, machine bases, etc.
Sumps, pits, chambers, etc. integral to the lowest floor construction.
Inclined and stepped slabs/beds
Ramps in slabs.
Retaining walls at changes in level.
Lift pits, etc. below the lowest floor, including waterproofing.
Swimming pool tanks, including boom pits, etc. and waterproofing.
Surface area excavations (i.e. to remove topsoil and to reduce levels), including earthwork support and surface treatments.
Pit excavations, including earthwork support.
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.Disposal of surface water and groundwater, where dewatering techniques not employed.
Consolidating and compacting formation level to receive floor construction.
Concrete, reinforcement, formwork (temporary and permanent) and working space for formwork.
Specialist concrete grades, such as waterproof concrete
Filling to make up levels.
Blinding beds.
Protection boarding for underside of floor/base slabs (e.g. to provide heave protection).
Damp-proof membranes,including gas-proof membranes serving as a damp-proof membrane.
Service ducts, etc. below the lowest floor construction
Fixing devices cast into concrete (i.e. dowels, anchor bolts, anchor boxes, anchor fixing slots, etc.)
Design joints, including at intersection of base slab/bed and external perimeter wall, to provide bays, etc.
Worked finishes (i.e. in situ surface treatments), including the application of surface hardeners and power floated finishes.
Structural screeds, including reinforcement.
Suspended timber floors, including floorboards, joists, joist struts, plates, etc. and supporting masonry/concrete walls underneath (i.e. load-bearing sleeper walls).
Precast/composite decking systems, including concrete components, in situ concrete, site-fixed formwork and reinforcement, filler units, fixing slips, metal clips and other fixings, joints (including grouting joints), worked finishes and performance tests.
Drainage below or within lowest floor assembly, including pipework, pipework ancillaries (e.g. gullies, gratings, rodding and access points) and fittings to pipework (to first manhole beyond the external enclosing walls).
Internal manholes, etc.,including channel benching, step irons, access covers and other accessories.
Floor outlets.
Prefabricated floor channels and gratings in ground floor construction.
Trenches for pipework, including excavation, earthwork support, backfilling and disposal of surplus material.
Granular beds and surrounds, concrete beds, cradles, haunching and surrounds, and foamed concrete backfill.
Venting below building (e.g. radon sumps underneath slab/bed).
Special filling material beneath base slab/bed.
Sundry items.
Testing and commissioning of drainage installations.
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 (11)
Bulk excavation to form basements (included in sub-element 1.1.4).
Non-structural screeds (included in sub-element 3.2.1).
Floating floors (included in sub-element 3.2.1).
Applied floor finishes (included in sub-element 3.2.1).
Finishes to swimming pool tanks, including tank linings (included in sub-element 3.2.1).
Hardeners and sealers applied to slabs/beds after construction (included in sub-element 3.2.1).
Podium slabs, transfer slabs and other suspended upper floor constructions forming part of the basement construction (included in element 2.2).
Basement roofs, i.e. where not performing as a floor (included in element 2.3).
Machine bases constructed on top of slabs and beds (included in element 5.14).
Drainage beyond the first manhole external to the enclosing walls of the building (included in sub-element 8.6.1).
Ground gas venting to the entire site (included in sub-element 0.4.3, as appropriate).
Navigation
Export
API Access
Access this component data programmatically:
GET /api/components/1.1.3/1/- Complete component details