Help needed for Glu-Lam span

[genestoy]

Hello,
We want to cover our patio with a matching roof of our house. The patio slab is 14' out from the house and 30' long. Because of an existing slab that was poured with the new house (a very small one) the posts for the three posts for the roof are being placed at each end corner and the third one is 18' from one corner and 12' from the other corner so it is not in the middle (also did not want a post directly in front of the patio door). My question is--what size of Glu-Lam beam is needed for the 18' span? We will use the same size but shorter for the 12' side so that side we know will be overbuilt, but want to keep it the same.
The structure above the Glu-Lam will be trusses that are 2' high connected to the house and down to 4" at the end and will be 16' long resting on the Glu-Lam at the 14' mark with a 2' overhang. The trusses will be spaced at 2' intervals. The house is in the Seattle, WA area and gets some snow occaisionally. Any help on this will be appreceiated! 8)
Thanks - Gene

[bkrahmer]

I could give a recommendation if I understood the layout a little better. I'm not good at visualizing without drawings. Can you sketch a drawing of the involved elements?

[genestoy]

Here is a rendering of what the project is and the span that is required--
Preferably a Glu-Lam that is 3 1/2" wide or do they come in 3 1/8" anyway that kind of width. Just need to know what depth of Glu-Lam would carry that 18' span ok considering some snow load occaisionally.
Thanks - Gene

[Rich]

Architectural grade glulam at 18' span approximates to 3-1/8" x 15"

[genestoy]

Thanks Rich, that is kind of what I had thought. :wink: Appreciate the info.
Gene

[bkrahmer]

BTW, what are all those white blotches on your neighbor's siding?