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Old 05-23-2010, 02:39 PM   #16
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Should there have been a beam?


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Originally Posted by xxPaulCPxx View Post
I suspect those 2x10 are not single boards that are 27' long. If they were, they would cost hundreds of dollars each! Where those boards break, there will be a wall underneith.

Is the space completely open underneith?
nope those are one complete left to right solid 2x10 board..... the plywood is on there just to walk down, pick it up there is no breaks in the joists under it...

the space under this is completely open, only walls on the 4 sides of the garage

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Old 05-23-2010, 03:01 PM   #17
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Should there have been a beam?


If you know the dimensions and the sag you can calc. the E value, the MOE. Then you can work backward as to how strong this is.
The other way is to decode the grading markings on the boards.
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Old 05-23-2010, 04:15 PM   #18
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Should there have been a beam?


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Originally Posted by Yoyizit View Post
If you know the dimensions and the sag you can calc. the E value, the MOE. Then you can work backward as to how strong this is.
The other way is to decode the grading markings on the boards.
What should I be looking for interms of coding on the boards? I have tons of 2x10's in the house exposed in other atic parts, but dont see anything printed on them anywhere
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Old 05-23-2010, 04:44 PM   #19
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Should there have been a beam?


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Originally Posted by BlueBSH View Post
What should I be looking for interms of coding on the boards? I have tons of 2x10's in the house exposed in other atic parts, but dont see anything printed on them anywhere
http://forestry.about.com/b/2008/01/...ade-stamps.htm
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Old 05-23-2010, 07:38 PM   #20
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Should there have been a beam?


our framing doesnt come stamped
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Old 05-24-2010, 12:09 PM   #21
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Should there have been a beam?


If you have a spare board you can measure E by stepping on the center, measuring the sag and using a formula.
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Old 05-24-2010, 01:21 PM   #22
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Should there have been a beam?


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Originally Posted by tpolk View Post
our framing doesnt come stamped
yeah, I can't find a stamp on any of the boards or on any of the other 2x10's in the house attic... only have info on the OSB flooring....


but for sag there is virtually no sag when no weight is on it, I think those 1x4's are holding the sag out that go vertical from the ceiling joist to the rafters.... and when stepping on it there is only about an inch of sag in the dead center of the floor...
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Old 05-24-2010, 01:49 PM   #23
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Should there have been a beam?


Quote:
Originally Posted by BlueBSH View Post
when stepping on it there is only about an inch of sag in the dead center of the floor...
Using
Beam Supported at Both Ends, Load at Center
from
http://www.engineeringtoolbox.com/be...on-d_1312.html
and knowing your weight, you can get close to an E value for your joists, and then work backwards to figure PSF loading.
The problem in this case is that some of your weight is carried by nearby joists so the sag is less than it would be for a single joist on edge.

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