• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Pearl Sutton
  • r ranson
  • Nicole Alderman
  • Joseph Lofthouse
  • paul wheaton
  • Mike Haasl
master gardeners:
  • jordan barton
  • John F Dean
  • Carla Burke
  • Greg Martin
  • Jay Angler
  • Leigh Tate
  • thomas rubino

Engineering specs for roundwood timbers

Posts: 1536
Location: Fennville MI
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
i am playing around working on framing ideas for our next, and final, house. We want to use roundwood that we will harvest from the site to build this, but as I am sketching along and working up the numbers of beams and posts and rafters, it occurred to me that I have no data on what Size a given post, beam, or rafter needs to be.
Anyone know of a source that can tell me, for example, what diameter of red oak timber is needed to bridge an eight foot span? If the total roof area is going to be 40x70 feet, with a single pitch, where can I find formulae for calculating the load on my posts, and then guides for what size they need to be for that load?

Am I even asking these questions in a way at makes sense?

Any help would be appreciated.
Posts: 5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Yes, your question makes perfect sense.
What you are trying to do is calculate the load bearing capacity. I'm still a bit in the dark myself, but I was recommended Jack Sobon's "Build a Classic Timber Framed House" as there is supposed to be a pretty good section in the back on the math for engineering a beam. I've got it on order at my local library, I'd suggest you do the same. If you're not interested in doing that, then all I could suggest would be finding a architectural engineer and either hiring him, or plying him with dinner and a six pack to walk you through the math to do it.
I'm so happy! And I wish to make this tiny ad happy too:
Rocket Mass Heater Manual - now free for a while
    Bookmark Topic Watch Topic
  • New Topic