In the NFPA standard 13-2016, the table lists different storage levels in meters:
| Table 16.3.3.1 | Table 17.3.3.1 |
Maximum storage height | 40 ft = 12 m | 40 ft = 12 m |
Maximum roof height | 45 ft = 13.7 m | 45 ft = 14 m ??? |
Diference is 1 ft = 0.3048 m.
Which measure is correct?
Cannot answer the question,
Not sure if this helps::
If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated shall be regarded as the requirement.
My understanding is that data in the tables are from testing using English units, like 40 ft and 45 ft...... Therefore, the 12 m meets "Maximum storage height 40 ft" requirement. and 14 m does not meet "Maximum roof height 45 ft" requirement.
I personally would choose 13.7 m as it is technically the most precise.
The 2019 edition of NFPA 13 will correct many of the conversion errors found on current edition. There are talks of printing a metric edition of NFPA 13.