SInce then I have acquired and read the Benson and Gruber book besides the Chappell book. "read several more books" is a great suggestion, you might notice in my original post a request for reference materials. I also have built two Rushton style small boats from the late 1800's which might not be relevant to timber frame construction except to illustrate my desire to use traditional techniques. Though the scale is different, many of the principals are similar. The good news is that I am not new to chisel and mallet having built a number of dressers, tables, etc. The rookie nature of my questions was evident. I attended one of his presentations about a year ago and had plenty to think about afterward.ĭo I sound bummed that its been a slow year, maybe next time. He has been working on a more user friendly version. You'll need to be an old school computer geek and engineer to use it. ![]() These guys wrote the book and they're offering a crash course.ĭr Manbeck wrote a program that has been available on the NFBA website, DAFI, Diaphragm and Frame Interaction. Dr Bonhoff who modelled the ground/post interactions will also be presenting as will others. Dr Harvey Manbeck will be presenting his senior class lectures in post frame construction including the engineering behind the diaphragm models they use. The upcoming frame builders expo, the post frame industry conference, will be in Louisville Feb 17-19. This is all part of design that Roger mentions above. Going from memory when they then applied the metal skin the deflection was under an inch. Midspan of the building length the plate bowed out 6". In testing a braced but unskinned 40' post framed building was laterally loaded to design load. The truss bracing is to prevent buckling of the deep, thin trusses. The metal skin on a modern post frame building is a quantifiable diaphragm and does contribute greatly to the building's lateral load resistance. Now you have $.04 worth in debt notes, not silver or gold, btw. I don't see this as all that big of a frame, a nice starter to learn on. How far below the eve line are you planning on placing the tie beam? If you use collar beams will you have enough head clearance on a narrow building, have you drawn it yet? Might as well use the space. That is what I am doing and commencing cutting in the morning. Full 1" boards and roof top guard with the metal on next. Rafter spacing on a 20' building and only 16' wide you could use 2' but I would fall on the 4' side, nice, neat and half the work. By using the continuous top plate your rafters are independent of the post, simplifying the work and raising.Īlso note/read that #7 has a tricky aspect which can be overcome by using the rafters in #9 and alluded to by Jim Rogers, I believe. I would use continuous top plates, skip the CG's which is how I read your post. That's enough questions for now, I'd appreciate any help, Should I instead use a larger # of small purlins, continuous purlins in notched rafters, plywood, or planking under the metal? I've been told metal roofs attach every 2 feet. Metal roof-I had planned on dovetailed purlins every 4 feet. ![]() What do you think, is this overbuild/under-built? I'm thinking collar ties and queen posts in the bents and just collar ties on the extra rafters. Besides the three rafters in the bents I'm thinking two more between each bent for a total of seven (7). I have no idea yet for the size or number for rafters of the 8/12 pitch roof. The tie beam in the bents will be joined to the posts with a wedged dovetail below the rafter and intermediate plate joints. Looks like the rafter to post joints with be either, housed birdsmouth rafter with through tail (#7 illustration), or step-lap (#10 illustration) from the Graphic Guide. Once it's up I hope to be able to do the rest on my own. My thinking is that I can get the three bents jointed and assembled on my own and then when help arrives use those "resources" to get the frame erected. There will be a couple weekends with a lot of help but otherwise I'll be chiseling and sawing in the Adirondack boonies by myself. ![]() ![]() For the most part I will be alone on this project. Thought I should mention why I hope to use bent construction. Thanks for the references, there're a big help.
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