Started by PEG688, April 10, 2006, 10:08:42 PM
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Quote from: Don_P on June 03, 2010, 09:19:46 PMThe codebook is referencing the NDS on notching restrictions. The NDS is assuming graded lumber. One thing I can think of is defect sizes vary with lumber dimensions. Assuming the driver of the ferrari knows to look for knots in the notch area then the 2x6 stud is stronger. If it's a dumb kid driving a ferrari at 100 mph I'd buckle up. I'm not worried about the notch or ledger dimensions if they were being done as per the drawing in the codebook, a box on top of a box. That isn't what is being done here. Studs notched on their tension face are running 2-4' above floor level where rafters with ties in the upper third of the roof height are supported by them. That is where my concern level kicks in. I'd also be interested in an opinion on putting a 2x ledger on the outside compression face of the wall and then running sheathing over the notched area. A traditional dutch barn is somewhat similar. They are built with H frame bents with rafters supported by the upright legs of the H. There have been 3 threads relating to failures in the past year on the TF Guild forum. The latest was a tour of multiple historic softwood barns. All had some degree of failure in that area.
Quote from: Don_P on June 04, 2010, 02:03:36 PMI give my engineer all the information I have that might be pertinent to help come up with the right solution. In that vein, a stud is intended to be axially loaded, look at the allowable slope of grain for a stud 1:4 and then for a #2, 1:8 , 3 times as steep as Select Struc at 1:12. I look at this situation more as a beam overhanging a post with a point load on the end, notched over the support on the tension face. Turn that diagram 90 degrees in your head and there is the kneewall with thrusting rafters except that we have a combined load.
QuoteI have to wonder if another factor must be included: The small house factor. After all, a 14 foot whide 24 foot long house is going to have a great deal less weight then a 20 foot wide 40 foot long house under the same conditions.
Quoteallowable slope of grain for a stud 1:4 and then for a #2, 1:8 , 3 times as steep as Select Struc at 1:12.