Roof Beam Span

Friends,

I am building a small ground level deck on the front of my house and would really like to not have any posts in the middle of the deck. This would mean I need to cover a single span of 5400.

The roof beam will be supporting 1800mm of laserlite.

My Span tables say I can use 190x45 seasoned MGP12, or 170x45 F17.

Does that refer to TP or Hardwood?

Also does anyone know what my options would be for using steel for the beam or to strengthen up the beam.

My preferance would be to use Treated pine for the beam.

Thanks for reading.


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