¶ Door entries in DEAP
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Number of doors
DEAP requires detail of the number of doors in the dwelling.
Example: A new dwelling with 2 identical external doors, one at the front and one at the rear
For each door, area = 1.85m2 and U-value = 3 W/m2K. In this case the door details can be entered in either of the following ways in DEAP: Note that in both cases the Total Heat Loss Door Area = 3.7m2.
i) Doors entered separately:
ii) Doors entered together:
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In DEAP 4, when entering a door, the draught-stripping is also specified:
Solid wooden and PVC doors: U-values
The default U-value for a solid wooden or PVC door is 3 W/m2K. A non-default door U-value may also be used once supported by the appropriate certification as outlined in Section 3.2 of DEAP and BR443 Section 12.
Glazed doors – U-value
In DEAP Section 6.2, a glazed door is one having between 30% and 60% glazing. The default U-value for a solid wood or PVC door is 3 W/m2K. Modern double and triple-glazing has a lower U-value, so the presence of glazing may lower the overall U-value of the door. If certified data is not available for the glazed door U-value, it can also be determined using the following formula:
- Uglass is the U-value of the glazing, which may be taken from certified data or defaulted from DEAP Table 6a or S9;
- %glass is the percentage of glazing in the door;
- Uframe is the U-value of the door frame which is taken to be 3 W/m2K;
- %frame is the percentage of door frame.
Example
A PVC door (area measured to be 1.9 m2) in an existing dwelling has a 0.8 m2 of double-glazing, with a manufacturer’s date-stamped indicating an installation date of 2005. What is the adjusted U-value of the door?
- Uglass = 2.2 W/m2K - taken from Table S9,
- %glass = 100*0.8/1.9 = 42.1%
- Uframe = 3 W/m2K, the default U-value for a PVC (or solid wooden) door,
- %frame = 100-42.1 = 57.9%
