Ask Structural Engineering Questions and Get Expert Answers ASAP
Can I build a 3 ply dimensional lumber beam to span 24 feet? If not, what should be used for the application. It is for a 20 foot, by 24 foot pergola. The potential plan would call for two 20 foot outside beams. Supported by 3 (6x6) posts each. To span the gap, would be 3 parallel beams 10 foot on center, at 24 feet in length. All Material: Pressure Treated pine.
Hi, I can help
Can I get back to you a little later this morning when I get to my office? Thanks
Is there any way you draw a rough sketch with some dimensions, I want to make sure I have your configuration correct.
You can attach the sketch to the chat window with the icon in the toolbar. If you can not scan the sketch, you could take a close-up picture of the sketch with your phone and attach that.
What type of roof will be on this structure?
What city and state do you live in so I can look at possible snow load?
I am going to switch over to the Q&A format and we can continue with the e-mail process. When you come back online, just reply to this last e-mail (use the e-mail account that you gave to JustAnswers) to tell me you are back. You do not need to rate any answer yet until we are complete and you are satisfied. Thanks.
Roof option # XXXXX: arches built by halves of 2x10 or 2x12 lumber with a ridge plank in the center, tied together by full length 2x4 perpendicular to rafters. (no sheathing, no cover)
Roof option # XXXXX: Gable design roof with same orientation as the the arches of 2x8 or 2x10 lumber., tied together by full length 2x4 perpendicular to rafters. (no sheathing, no cover)
This would be built in Washington County, MD..
As for center 24 foot beam. That is only something I like to do to add stability for potential future use (not necessarily for current structural need).
Thank you for your assistance. This conversation does provide confidence in putting the whole concept together.