Decks, Patios, Porches and Docks - Beam

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Louisphillip
10-05-08, 08:48 AM
What size(s) beam I need for a 18' spam for a back porch? I am using Douglas Fir #2. Will a 2= 2x10s or 2= 2x12s work?
I appreciate the input
Thanks,

Concretemasonry
10-05-08, 10:40 AM
Not much information. -

How much do you, your wife and dog weight?

How big an area and what are the joist spans?
Louisphillip
10-05-08, 04:14 PM
Existing concrete slab with already footers. Existing porch roof too deteriorate, will replace but I would like to eliminate the center post for viewing purposes. 8" rafters 24" on center 20' long by 11' deep. I can leave 1' of overhang on each corner, then I have 18" span, I wouldn't like steel beam and I thought, maybe using 2= 2x12x20s or maybe something else as 2= 4x8x20s.

Thank for any input