Measurement conditions to DIN EN 13829 /ISO 9972
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Measurement conditions to DIN EN 13829 /ISO 9972
6.1 Time of measurement
DIN EN 13829: After completion of the building
envelope
ISO 9972: After completion of the airtight layer
NOTE!
However, for practical purposes it is better to carry
out the measurement as early as possible and,
where possible, before top surfaces and coatings
are installed. This ensures the amount of work
required to patch up or carry out repairs is kept as
low as possible.
6.2 Weather conditions
Suitable weather conditions are fundamental to
meaningful measurements. Ideal weather condi-
tions are understood to be minor temperature
differences between indoors and outdoors as well
as low wind speeds.
NOTE!
If necessary, lower the temperature difference by
altering the indoor temperature, for example by
opening a window.
To comply with a measurement to DIN EN 13829
the following limit values must not be exceeded:
1. The product obtained from the temperature
difference and the height of the building enve-
lope must be less than 500 m
.
K
NOTE!
The value 500 m
.
K is stated in the DIN EN
13829. Due to the latest insights and practical ex-
perience the trade association Airtightness in
Construction (FLiB) is of the view that the product
obtained from the building height and the temper-
ature difference must not exceed a maximum val-
ue of 250 m
.
K, see FLiB manual Building Air-
tightness, September 2008, page 52
(correspondingly, ISO 9972 also states the value
250 m
.
K).
