2.3.1-1
Roof structure - pitched roofs
Component Information
- Code:
- 2.3.1-1
- Sequence:
- 1
- Unit:
- m2
- Sub-Element:
- 2.3.1 - 1 Roof structure
Roof structure - pitched roofs
details, including design loads (kN/m2), spans (m) and angle of pitch (°), to be stated
Component Statistics
Measurement Rules
Included Items
Excluded Items
Measurement Rules (6)
The area measured for pitched roofs is the area of the roof on plan, to the extremities of the eaves.
The area measured for dormers is the area of the dormer on plan, to the extremities of the eaves and valleys.
Flat roofs (without parapet walls): the area measured is the area of the roof on plan, to the extremities of the eaves.
Flat roofs (with parapet walls): the area measured is the area within the parapet walls measured to the internal face of the parapet walls to the roof.
Note: Roof housings (e.g. lift motor and plant rooms) should be broken down into the appropriate constituent components and measured in accordance with the measurement rules for the applicable components.Work to existing buildings is to be described and identified separately.
Contractor-designed work is to be described and identified separately.
Note: Where the contractor is only responsible for designing specific elements and/or components of the building project (i.e. not the entire building project).Included Items (20)
Roof decks and slabs.
Trusses, purlins, rafters, binders, hangers, hip and valley rafters, ridge boards, wall plates, firrings, ceiling joists, etc.
Dormer trusses.
Prefabricated dormers.
Specialist subcontractor/supplier design of roof trusses.
Roof boarding.
Beams that form an integral part of the roof in a framed building.
Carpenter’s metalwork, including connectors, bracings, straps, hangers, strutting, joist hangers, bolts, etc.
Eaves and verge structure.
Gable ends and internal walls above wall plate level forming part of the roof construction.
Concrete, reinforcement, formwork (temporary and permanent) and worked finishes.
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.
Basement roofs (i.e. where not acting as a podium slab or transfer slab).
Roofs to internal buildings.
Beams in unframed buildings.
Structural screeds to roofs, including reinforcement and worked finishes.
Permanent formwork.
Thermal insulation laid in roof space (e.g. laid between or over ceiling joists).
Sundry items.
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)
External and internal roofs.
Dormer coverings and windows to dormers (included in sub-elements 2.3.2 and 2.6.1, as appropriate).
Basement roofs acting as a podium slab or transfer slab (included in element 2.2, as appropriate).
Parapet wall, including copings and cappings (included in element 2.5).
Roof platforms integral to framing system, such as off-site manufactured timber frames or panel systems (included in sub-element 2.1.5).
Gable ends formed as part of the external wall construction (included in element 2.5).
Internal walls in roof formed as part of the internal wall construction (included in element 2.7).
Chimneys (included in elements 2.5 or 2.7, as appropriate).
Canopies to external areas (included in sub-element 8.8.2).
Canopies to external doors (included in sub-element 2.6.2).
Horizontal solar/rainscreen systems providing protection to external walls (included in sub-element 2.5.3).
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