On Tue, 17 Jul 2012 10:06:10 -0500, "Doug"
wrote:

There are probably online beam load calculators that
could answer the question. But every place I know you
would need a building permit to add a porch on to a
house. And here to get that building permit you need
a drawing signed and stamped by a licensed architect.
So, I'd start with finding out what it takes to get a building
permit. If it's like here, you'd be wasting your time
figuring it out because the architect is going to do it
anyway.


I guess you are right because everyone is saying the same thing. I
wanted to answer his question directly but just need more info but
that will not address the legal aspects of building it.

The OP is in Canada.