We have CRF and Smoke Development values for a number of timber species, but unfortunately not for Baltic pine. Nor do we know of a source of this data. Perhaps the importer could provide details, or arrange for the required tests.

Your best source of information is a Technical Data Sheet titled Timber Decks - Commercial, Industrial & Marine. It's number 7 in a series published by Timber Queensland, and can be downloaded via this link http://www.dtmtimber.com.au/downloads/TQ_TDS/tds_07_Timber-Deck_final.pdf. Table 4 gives decking board spans under different load conditions. Spans vary according to the stress grade of the timber.