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Old 06-30-2018, 12:21 PM   #1 (permalink)
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PBB carpenters....load bearing question

Purchased a property with a barn in the back.

It is a 2 level structure with a basement.

On the ground level is a "garage" of sorts. Wood floor as it has a basement under it.

It is supported by true 3x8 inch joists. Attatched to them is also a 2x6 (1 1/2x7?)

They are spaced 16 on center, and span 14'

One the front of the building they ride on the foundation. They span 14' and attach to a beam in the center of the barn floor via a true 6x8 beam. The beam has a true 2x4 attached to it and the joists have a notch to sit on the 2x4 (sorry I cant explain it more proffesionally.

The 6x8 is supported by either side foundation and has 2 steel posts approx 8' span.

The previous owner supposudly parked a car in the "garage" portion according to the neighbor. Unsure the specifics.

How/where could I get an accurate idea of the capacity of the floor? I am contemplating putting my 23' deckover trailer inside maybe.

Thanks.
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Old 06-30-2018, 12:46 PM   #2 (permalink)
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You want somewhere between 40-50 lbs. sq. ft. for a garage floor live load.

Accroding to this, that' a 2x10.

https://courses.cit.cornell.edu/arch...8.1/index.html

My guess is you'll be just fine, assuming the 2x6 is well connected to the original joist.

http://www.awc.org/pdf/codes-standar...s2012-1111.pdf
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Old 06-30-2018, 01:01 PM   #3 (permalink)
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Originally Posted by Screwzer2 View Post
You want somewhere between 40-50 lbs. sq. ft. for a garage floor live load.

Accroding to this, that' a 2x10.

https://courses.cit.cornell.edu/arch...8.1/index.html

My guess is you'll be just fine, assuming the 2x6 is well connected to the original joist.

http://www.awc.org/pdf/codes-standar...s2012-1111.pdf
Seems legit!
Get us a pic.
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Old 06-30-2018, 01:31 PM   #4 (permalink)
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Originally Posted by Screwzer2 View Post
You want somewhere between 40-50 lbs. sq. ft. for a garage floor live load.

Accroding to this, that' a 2x10.

https://courses.cit.cornell.edu/arch...8.1/index.html

My guess is you'll be just fine, assuming the 2x6 is well connected to the original joist.

http://www.awc.org/pdf/codes-standar...s2012-1111.pdf

I design residential floor live loading at 40 PSF
Commercial live at 60 PSF.
Balconies at 70
Commercial hallways and areas of large usage at 100

I would avoid putting a trailer on a wood framed structure, unless itís dssigned for such load, and designed for a phenomenal deflection ratio.
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Old 06-30-2018, 01:52 PM   #5 (permalink)
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Well...lol. I dont have a star, last I heard pre VS cant post a pic correct?
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Old 06-30-2018, 06:49 PM   #6 (permalink)
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Originally Posted by RYAN283 View Post
I design residential floor live loading at 40 PSF
Commercial live at 60 PSF.
Balconies at 70
Commercial hallways and areas of large usage at 100

I would avoid putting a trailer on a wood framed structure, unless itís dssigned for such load, and designed for a phenomenal deflection ratio.
I dunno, I went to the AWA website and they were specing 40-50lbs. live load, for a residential wood floored garage.

Why don't you run the numbers for the OP and tell us what load his floor is capable of withstanding? Span tables and calculators aren't helping, since they assume shitty #2 modern dimensions.
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Old 06-30-2018, 07:01 PM   #7 (permalink)
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I figured that is what I would run into (graphs/tables using modern dimensional lumber)
Given that I am not a carpenter, I doubt I could find correct specs.

I was going to use close enough but under numbers and guess low.

The neighbor keeps telling me to park my Jeep Grand Cherokee in there. It scales at 4800lbs.

Ya, no thanks 🙂

My trailer has dual 3500lb axes, but says its rated to haul 4700lb. So that leaves it, buy my assumption to weight 2300lb.

I have a Playcraft RV 20
http://www.playcrafttrailer.com/rv-trailer

Last edited by trailduster76; 06-30-2018 at 07:13 PM.
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Old 06-30-2018, 08:20 PM   #8 (permalink)
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I dunno, I went to the AWA website and they were specing 40-50lbs. live load, for a residential wood floored garage.

Why don't you run the numbers for the OP and tell us what load his floor is capable of withstanding? Span tables and calculators aren't helping, since they assume shitty #2 modern dimensions.
Iím accustomed to using MSR lumber in the truss industry.
So, itís all of know species and moisture content.

Iím not sure what grade of lumber (or species) heís got.
And like youíve stated, thereís an equally important issue regarding the connection of the joists to the main beam.
Also, what supports the beam? Columns, multi-ply post, CMU, steel ?

With modern eng trusses, the concern isnít really then trussís ability to perform from a structural standpoint, but the vibration of the vehicle can/will jeopardize the joint plates.

Moving the trailer creates a moving load, which is pretty significant.

I guess Iíd leave the trailer outside. Cuz, itís a trailer.
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Old 06-30-2018, 08:43 PM   #9 (permalink)
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Originally Posted by RYAN283 View Post
Iím accustomed to using MSR lumber in the truss industry.
So, itís all of know species and moisture content.

Iím not sure what grade of lumber (or species) heís got.
And like youíve stated, thereís an equally important issue regarding the connection of the joists to the main beam.
Also, what supports the beam? Columns, multi-ply post, CMU, steel ?

With modern eng trusses, the concern isnít really then trussís ability to perform from a structural standpoint, but the vibration of the vehicle can/will jeopardize the joint plates.

Moving the trailer creates a moving load, which is pretty significant.

I guess Iíd leave the trailer outside. Cuz, itís a trailer.
Nevermind screwhead...his grey matter is steeped in THC and he'll cite three more internet sites and Politico to make his point.
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