|Forum topic by dem45133||posted 01-09-2012 04:31 AM||8378 views||0 times favorited||11 replies|
01-09-2012 04:31 AM
Good day gentlemen and any ladies.
I am in the middle of a major remodel and am jointing two rooms that are separated by a main support wall for the home. This place is a 105 year old “sorta cape-cod but without the dormers (yet)” 11 foot sidewalls to eave, 10.5” pitch. 4 rooms down 2 up centered over the bottom. 24×30 outside footprint. Upstairs “knee” walls are almost full ceiling height. The wall I am removing is holding up the second floor and by extension the roof… so its critical to beam correctly.
We are doing a special open joist ceiling of the bottom floor showing off our Douglas Fir floors upstairs and a brightening of our red oak full dimension joists. The open beam will set mid-span where the joists meet across a 24 ft wide gable. I do not want modern materials unless its hidden under matching rough sawn red oak… and I did research this some.
But… why not use the real thing? I have a woods full and so does my neighbor (who also has a 42” circular mill) where we can cut a solid red oak beam with the matching circular kerf marks just like our hundred year old joists are (as compared to band sawn). The ends of said beam will be inside a 4”wall sitting on 4×8 oak vertical posts set directly on the base plate on top of the center foundation. Being hidden I plan to through bolt 1/2” by 4” steel plate vertically between the support posts and the sides of the beam to lock the beam ends in place to control warping while it dries (yes it will be only air dried outside for some period of time before installing… but it will not be kiln dried. the load span will be 13’8” and I am leaning toward a 8inch wide x 12” (maybe 14”) deep solid beam cut from one of our trees that has a clear 16ft section of trunk. While drying I may center and quarter post it temporarily… but not sure yet… it really should cure under a minimal load or none I believe.
Does any one know of an engineering calculator to calculate bearing capacity of a span… and the modulus of elasticity for red oak?. I grew up on a place with mortise and tendon east coast 250 year old barns that we put better than 50,000 bales in… still strong as it was when they built it… solid beams are certainly nothing new… but thought I’d ask for any opinions and a site for the calculator. Remember…this is all open construction and finished… no hiding places anywhere.
Oh, I am an scientist/engineer kind of guy… just not in civil… I can do the calculus on any of it but I am way way out of practice. Calculus classes were 35 years ago.
Many thanks in advance… Regards, Dave