Design and Specification Flashcards
Level 1 - 3 (12 cards)
What is a bill of quantities?
Provides project specific measured quantities of the items of work identified by the schedule of work
Can you combine schedules of work, specifications and bills of quantities?
A ‘Specified Schedule of Work’ combines both the list of work and the description / workmanship elements
A ‘Specified Bill of Quantities’ combines all three elements - list of work items, descriptions and quantities
What guidance is available to designers when writing specification documents?
RICS Guidance Note - Design and Specification
Details best practice guidance relevant to design and specification processes, including:
Role of the designer
Risks associated with designing
Structure and contents of design documents
Legislative considerations
What is the CAWS and how can it be used in design and specification?
CAWS is the categorisation of work to create a consistent arrangement of work sections
Used in the NBS and other industry specification/pricing products such as Spons
CAWS has now been incorporated into Uniclass
CAWS is the categorisation of work to create a consistent arrangement of work sections
Used in the NBS and other industry specification/pricing products such as Spons
CAWS has now been incorporated into Uniclass
A voluntary classification system for the construction industry that can be used to organise information throughout all aspects of the design and construction process
Now on version 3, ‘Uniclass 2015’, which supersedes Uniclass and Uniclass 2
Compatible with BIM
Maintained by the NBS to ensure it remains relevant and mapped to other systems
What is the NRM and how can it be used in design and specification?
Suite of three documents published by the RICS to provide a standard set of measurement rules for estimating, cost planning, procurement and whole-life costing for construction projects
What is a U-value?
A U-value is a measure of heat loss in a building element
The higher the U-value, the worse the thermal performance
How is a U-value calculated?
U-value = 1 / (ΣR + Ri + Ro)
Ri = thermal resistance of inside surface
Ro = thermal resistance of outside surface
ΣR = sum of the thermal resistances of all other building components
NB: R = d / k (thickness of component / thermal conductivity of that component)
The conventions for calculating U-values are established by BR 443 (Conventions for U-value calculations)
What are the required U-values for walls, floors, roofs and windows of new domestic dwellings?
Roof - 0.20 W/(m².K)
Wall - 0.30 W/(m².K)
Floor - 0.25 W/(m².K)
Windows, roof windows, curtain walling and pedestrian doors - 2.00 W/(m².K)
What are the required U-values for walls, floors, roofs and windows of new buildings other than dwellings?
Roof - 0.25 W/(m².K)
Wall - 0.35 W/(m².K)
Floor - 0.25 W/(m².K)
Windows, roof windows, curtain walling and pedestrian doors - 2.20 W/(m².K)
What are the U-value requirements in existing buildings?
Existing buildings require reasonable provision for U-values in newly constructed thermal elements (such as those constructed as part of an extension) as well as upgrading retained thermal elements
Refer to tables in Part L1B for dwellings and Part L2B for non-dwelling
