Dead Loads Table in ASCE 7-10 (Table C3)

[333OnlyHalfEvil]

Hello everyone,

I have some questions about the table stated in the subject of this thread.

1. What is this table referring to when it says FLOOR FILL?
2. What is the deal with the DOUBLE WOOD FLOOR loads? Do you know what exactly that means? It seems 6psf for a 2x6 @ 12" o.c. is a little high...
3. Mechanical Duct Allowance of 4psf?? Should I be applying this to my unit loads in all floors/roofs/walls? (note I'm currently using a misc load to account for stuff like this).
4. Finally, it doesn't seem like some of the weights in this table match up too well. For example, it gives "subflooring 3/4in" as 3psf. But plywood is 0.4 psf per 1/8in thickness elsewhere? 0.4 * 6 = 2.4psf...

What do you think? Does anyone else use this table? If not, where are you getting your dead loads from when you don't know what specific material/manufacturer the contractor will end up using?

Thanks in advance

 

[333OnlyHalfEvil]

Bump.

Anyone?

I'm assuming everyone just calculates up the loads as best they can and no one really uses this table?

 

[JAE]

1. What is this table referring to when it says FLOOR FILL? [red] These are materials usually used on top of the main floor framing for sound control, fire protection, etc. We don't use them much.[/red]

2. What is the deal with the DOUBLE WOOD FLOOR loads? Do you know what exactly that means? It seems 6psf for a 2x6 @ 12" o.c. is a little high...[red] This would be for (2) 2x6 joists (vs. one joist) every 12" o.c. Not sure why they do that here. [/red]

3. Mechanical Duct Allowance of 4psf?? Should I be applying this to my unit loads in all floors/roofs/walls? (note I'm currently using a misc load to account for stuff like this).[red]We usually use a 5 psf allowance on general commercial structures for mechanical and electrical loads - ductwork, lighting, sprinkler lines (dry), minor cables, conduit. For specific mechanical units we use the unit's weight in addition to the 5 psf. Sometimes we alter this amount up or down depending on our knowledge of the systems used. [/red]

4. Finally, it doesn't seem like some of the weights in this table match up too well. For example, it gives "subflooring 3/4in" as 3psf. But plywood is 0.4 psf per 1/8in thickness elsewhere? 0.4 * 6 = 2.4psf...
[red]1x subflooring can be a denser material perhaps so 3 psf. We typically use 3 psf per inch of thickness for most wood sheathing.[/red]

Does anyone else use this table?
[red]We use multiple tables from various sources. Usually get a feel for weights after a while so don't depend on the actual/exact numbers - rounding up a bit - unless we are trying to get an existing condition figured out and need more precision.[/red]


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[333OnlyHalfEvil]

Thank you for the reply. Very helpful. Exactly the response I was looking for.

What multiple tables from various sources do you use?

 

[JAE]

I think several were from various books and publications:
1. Means cost guide
2. CRSI perhaps?
3. Textbooks
4. AITC manual?
5. Misc masonry, wood, and steel publications.

So I'm not very explicit here but I've just gathered them over the years whenever I've found them and copied them off and into my notebook.

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