As Boxspan has a regular shape like timber, fixing to other components is generally by exactly the same methods as would be used with timber. The only exception being the use of tek screws instead of nails into the Boxspan. Accordingly, cyclone straps, triple grips, multigrips, speed brace, joist hangers and many other fixing methods can be used.

Yes Boxspan can cantilever further than most of it’s timber equivalents.
See span charts

CCA treated timber products should not be placed in direct contact with zinc coated products like Boxspan. CCA stands for copper chromate and arsenic. The copper can be leached out of the timber and reacts with the zinc coating of Boxspan. 

Boxspan will not burn or add to the combustible material but it will lose its strength in prolonged exposure to intense heat.   

Add image beamsizes2.jpg

Per lineal metre the beams weigh:

BHP recommends against the use of exposed zinc coated steel when within 1 km of breaking surf.

How long can the Boxspan be made?
Standard lengths are up to 12.5 metres long. Longer lengths by arrangement.