3.4.3.1 Building Regulations Construction Data
Scotland Section 6 (2022) requires certain attributes to be entered for constructions in addition to the data required for other thermal calculations. This data is entered in the constructions database program CDB. The additional attributes (broken down by construction category, and including attributes) are:
Glazing
Display window?
Tick this box if the window is a display window. Such windows are exempt from certain Section 6 (2022) requirements.
Frame material and percentage
Select a frame material from the drop-down list and consider the % frame value.
Doors
Door type
a. Select from the following types:
b. personnel door
c. vehicle access or similar large door
d. wall or roof element that is not to be treated as a door for the purposes of Scotland Section 6 (2022)
e. high usage entrance doors
f. curtain wall
Doors of types b, d and e form special categories in Scotland Section 6 (2022). Type c is provided to allow door drawing facilities in ModelIT to be used to create wall or roof elements.
Ground floors
· Ground floor U-values can be calculated using a floor area / perimeter method.
· Floor area
· Enter the ground floor area
· Exposed floor perimeter
· Enter the exposed floor perimeter
· External wall thickness
· Enter the wall thickness of the external wall that bounds the floor perimeter.
· Ground conductivity
· Enter the conductivity of the ground below the ground floor
All construction categories
Thermal bridging coefficient
Scotland Section 6 (2022) requires an allowance to be made for non-repeating thermal bridging. In the VE implementation this is handled via a coefficient expressing this component of heat loss as a multiple of element area. This can be thought of as an addition to element U-value (10% for the notional building 25% for the actual building).
In the notional building, thermal bridging coefficients are set to standard values laid down in the NCM Modelling Guide.
