Global Factors

Building: Rooms and global factors
Guidance on re-use of data for global factors is available here
Data Entry Item	Guidance on re-use of data	Notes and examples
Thermal bridging factor	Detailed guidance on the use of default and non-default thermal bridging factors is given in here of the DEAP Manual for new and existing dwellings. Any y-value other than 0.15 requires supporting documentation.	Drawings and schedule identifying: All junctions; All key junctions; Junction lengths (where a non-default y- value is used);
Thermal mass category	For new dwellings, use DEAP Table 2.41 and indicate the overall thermal mass category on the DEAP survey form. Calculations to determine the overall mass category via the derivation of the “AmAf” value must be held on file. The overall thermal mass category is one of Low; Medium-low; Medium; Medium- high or High. For existing dwellings, follow Table 2.43 or Table 2.41 of the DEAP Manual and indicate the thermal mass of walls and floors in the DEAP Survey Form or on sketches/drawings. Where a building element comprises more than one thermal mass, e.g., masonry internal walls on ground floor with timber stud on the 1st floor, sufficient information should be recorded to determine the areas of each thermal mass type (Table 2.41 or Table 2.43) or allow an informed decision of which is predominant where Table 2.43 is used.	Any calculations used to derive the thermal mass category (e.g., if using the “AmAf” approach) including sketches/ drawings highlighting thermally heavy elements Survey form indicating thermal mass of building elements
Rooms	Optional information on each room type, the storey in which it exists. Room names are recorded in the Rooms tab.	Sketches/drawings showing room names/types

¶ Global Factors