by making a minor design change, which took 5 min. it is only a one story dwelling and there will be limited storage above the garage which is the 34' x 25'8" dimensions. i have built a few homes but nothing with rooms this size. yes, building codes will not issue my permits until i have done this. what i plan to do is all the leg work with the design and structural integrity, and then drop everything off to a structural engineer to have the calculations approved. i am a huge diy'er, and have designed the house almost entirely myself, something to be proud of when the project is done. i have drawn the house in autocad, a trait picked up in college. engineering though it has been a long time and i am not in that field as a career either. I apologize for not being a little more thorough with my description. substrate needs to be properly glued and screwed in these cases, not just nailed down You also need to consider the deflection values for your finished flooring products if its going to be something besides carpet An I beam is unlikely to cost less, at least around here You may need a crane or hydraulic rollers for the I beam though. A crew can probably move LVL's no problem. The installs were compliant but nobody liked them. When LVL's first started getting wide usage here, noticeable bounce was a real issue. Even if it is 'safe' people don't like walking on a floor that they can feel moving. Unfortunately the idiot contractor and architect didn't take life into account. I've been on too many jobs where, yes it works per the load table. With spans that big I would not recommend just looking at load tables and saying 'oh that works per the load table'. There are however jobs where I leave the Spec work to a Pro. I've dealt with enough jobs, engineers and architects to know what will and what won't work. I've been in the trades my whole life and have no issue designing or spec'ing loads or structural components for 'normal' houses. If you don't have the money, then you probably shouldn't be bigger that monstrosity. Of course if you are building rooms that big you should have sufficient money to hire an SE. So unless you are a licensed SE, hire one. Those rooms are too big for a layman to read books and design it himself. Hopefully this doesn't sound too rude, but if you are building rooms that size you should be hiring a Structural Engineer to do your load calcs. any information on the beam size would be appreciated. The room is 34' x 25'8" and the way it is designed the beam should span the 34'. it seems to me that a single I beam is more cost effective than all this lumber. I have all the formulas for calculating the size of I beam needed but i would like a little reassurance from some other professionals. i have redesigned the lvl support beams as to where it will work but i am increasing the amount of material as to where the cost is getting high. the reason this became an issue is i have another room with a 34' span and a lvl beam will not work because of deflection. instead of using engineered lumber, would it be more cost effective to use a single I beam for the main beam and the tributary. there is also 3 - 24" lvl's that t into this beam about half way that spans 21.5' also supporting joists. in the icc joist table i used live load 20 psf and dead load 10 psf to calculate joist sizes. i have 4 - 24" lvl's to carry the load over the 29' span. I am designing my house and i have a room that is 29' x 41.5' with 2 different ceiling heights.
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