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Old 07-22-2018, 08:32 PM   #16
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Re: Beam size for 30' span, 8' stringers either side


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Originally Posted by jjchvl View Post
Hope I've done this right...the research that I've done suggests that 2X8s, 16 on center can support up to a 12 foot span of floor that is used for "active" loads(foot traffic, etc.) and that 2x10s 16 on center can support up to a 16 foot span of the same. So, going by that, I'm hoping that rebuilding this floor using 2x10s, even dressed, should be fine. I suggested rough cut because rough cut is actually the true 2x10 measurement so would supply just that much more strength. A lot of people up here in Maine build with rough cut for that reason. It does make later remodeling jobs a challenge though! Anyway, this job isn't complicated unless we try to go with a 30 foot beam. It's basically a very well supported 30x16 foot hole in the middle of the church floor. I can't see how using 2x10s across the 16 foot width(dressed or rough), would fail to work very well. Certainly FAR better than the rotted pine trees which are in place now. If my research/math concerning the 2x10s and their safe supportive spans is incorrect, I would be very glad and appreciative to be set straight. As I said, we could even double them if needed and still come out under any contractors quote im pretty sure.
Again, thanks for taking time to reply.
All our floors are 2x10s 16" on center but as soon as you get to 16 feet long the city just says they want and engieers report. Bedrooms are fine but kitchens and living room they tend go up to doubles at 16 or 12" OC special bridging and extra heavy hangers and the lumber yard tells us that the engineered floor would have been cheaper.
What you are up against is how many people can be on the floor at the same time and that load may not be spread evenly on the whole floor.


We can find the videos of floors falling out from under a crowd.
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Old 07-22-2018, 08:58 PM   #17
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Thanks, that's another suggestion I've given these folk and mentioned in my posts here looking for feedback; double up the joists. I've also mentioned going to 12 inches on center to the church leaders(although I didn't mention that here). Either method should do the trick and actually be a bit overkill for the needs of this church(they aren't the type who jump and yell-most are over 70 lol). But it's always better to be safe than sorry. I'd rather have them over build than underbuild.

I very much appreciate your input but still have to disagree about a contractor/engineer being cheaper. This is a simple, we'll supported 16x30 foot hole in a floor. The edges surrounding the entire hole are supported by the concrete walls of the first basement renovation. Another, later basement renovation placed an addition to the basements concrete walls further out to support the additional floor space that was added. It's not like the edges of this 16x30 foot area will be flapping in the wind or hanging unsupported once the area is removed. I keep trying to emphasize that this area is well supported with plenty of solid place to put in new, proper floor joists. The church folk initially wanted an unsupported 30 foot beam to span the length of this area. I know nothing about modern beam technology thus I asked for advice here. Obviously, a beam will not serve their needs so I've at least learned that. But I've also learned from speaking with you folk and thus pushing myself to investigate more as a result, that 2x10s over a 16 foot span is quite do-able, especially if reinforced in one of the ways already mentioned. So, all in all I've received good answers to my questions regardless of how the answers arrived. So thanks!
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Old 07-22-2018, 09:19 PM   #18
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Re: Beam size for 30' span, 8' stringers either side


Quote:
Originally Posted by jjchvl View Post
Thanks, that's another suggestion I've given these folk and mentioned in my posts here looking for feedback; double up the joists. I've also mentioned going to 12 inches on center to the church leaders(although I didn't mention that here). Either method should do the trick and actually be a bit overkill for the needs of this church(they aren't the type who jump and yell-most are over 70 lol). But it's always better to be safe than sorry. I'd rather have them over build than underbuild.

I very much appreciate your input but still have to disagree about a contractor/engineer being cheaper. This is a simple, we'll supported 16x30 foot hole in a floor. The edges surrounding the entire hole are supported by the concrete walls of the first basement renovation. Another, later basement renovation placed an addition to the basements concrete walls further out to support the additional floor space that was added. It's not like the edges of this 16x30 foot area will be flapping in the wind or hanging unsupported once the area is removed. I keep trying to emphasize that this area is well supported with plenty of solid place to put in new, proper floor joists. The church folk initially wanted an unsupported 30 foot beam to span the length of this area. I know nothing about modern beam technology thus I asked for advice here. Obviously, a beam will not serve their needs so I've at least learned that. But I've also learned from speaking with you folk and thus pushing myself to investigate more as a result, that 2x10s over a 16 foot span is quite do-able, especially if reinforced in one of the ways already mentioned. So, all in all I've received good answers to my questions regardless of how the answers arrived. So thanks!
I understand what you are saying but a failure in any part of the structure after this have people and lawyers looking at every detail of the work that is done. That is place I never put myself. Engineers are held responsible for 30 years and carry the insurance for that.
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Old 07-22-2018, 09:33 PM   #19
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Well, if I let the fear of being sued bother me then I'd never do anything to help anyone. Yet volunteering to help folk do things that they normally could never afford is something I've done for quite awhile. As a direct result, I don't have much for anyone to sue me for anyway, so they wouldn't get much if they tried(my vehicle? Bicycle? A few tools? Never been much for material possessions lol). I appreciate your concern but I guess I'd prefer to keep helping rather than allow fear to persuade me never to help. I must confess that my behavior isn't entirely atruistic. I get warm fuzzies from it sometimes so there is that 😉 And I doubt a heavily overbuilt 2x10 16 foot span floor in this tiny church will be my downfall. Something else maybe but probably not this job.
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Old 07-22-2018, 09:56 PM   #20
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Re: Beam size for 30' span, 8' stringers either side


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Originally Posted by jjchvl View Post
Well, if I let the fear of being sued bother me then I'd never do anything to help anyone. Yet volunteering to help folk do things that they normally could never afford is something I've done for quite awhile. As a direct result, I don't have much for anyone to sue me for anyway, so they wouldn't get much if they tried(my vehicle? Bicycle? A few tools? Never been much for material possessions lol). I appreciate your concern but I guess I'd prefer to keep helping rather than allow fear to persuade me never to help. I must confess that my behavior isn't entirely atruistic. I get warm fuzzies from it sometimes so there is that 😉 And I doubt a heavily overbuilt 2x10 16 foot span floor in this tiny church will be my downfall. Something else maybe but probably not this job.
Does the church carry insurance??
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Old 07-22-2018, 11:09 PM   #21
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Yes, the church has insurance. I don't know what kind of coverage exactly but they do have it because I heard the pastor there mention that he's afraid of losing it if the insurance people ever saw what cutrently serves for a floor lol!
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Old 07-22-2018, 11:29 PM   #22
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Re: Beam size for 30' span, 8' stringers either side


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Originally Posted by jjchvl View Post
Yes, the church has insurance. I don't know what kind of coverage exactly but they do have it because I heard the pastor there mention that he's afraid of losing it if the insurance people ever saw what cutrently serves for a floor lol!
Ask him if he knows what insurance he should have because volunteers are working on major renovations in the church.
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