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RE: Roof Framing, Joist Spacing...Input please

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Oops.

Pardon my zeal.

It was a good time to mention the issue anyway.

Carry on.

Regards,

Bill Allen, S.E. (CA #2607)
ALLEN DESIGNS
Laguna Niguel, CA
http://www.AllenDesigns.com 

||-----Original Message-----
||From: Scott E Maxwell [mailto:smaxwell(--nospam--at)engin.umich.edu]
||Sent: Sunday, July 23, 2000 6:19 PM
||To: seaint(--nospam--at)seaint.org
||Subject: RE: Roof Framing, Joist Spacing...Input please
||
||
||Bill,
||
||I agree with your concern about the manner in which concrete 
||is placed on
||metal deck.  It is something that requires some consideration.
||
||However, keep in mind that the original question was 
||pertaining to roof
||deck and the SDI table that has been mentioned is for roof 
||deck (i.e. no
||concrete).
||
||Scott Maxwell, PE, SE
||
||
||On Sat, 22 Jul 2000, Bill Allen wrote:
||
||> In my experience, the deck failed while placing the 
||concrete. After the deck
||> was welded. My caution to my colleagues remains intact.
||> 
||> Regards,
||> 
||> Bill Allen, S.E. (CA #2607)
||> ALLEN DESIGNS
||> Laguna Niguel, CA
||> http://www.AllenDesigns.com
||> 
||> ||-----Original Message-----
||> ||From: Scott E Maxwell [mailto:smaxwell(--nospam--at)engin.umich.edu]
||> ||Sent: Saturday, July 22, 2000 9:46 PM
||> ||To: seaint(--nospam--at)seaint.org
||> ||Subject: Re: Roof Framing, Joist Spacing...Input please
||> ||
||> ||
||> ||Also, while none of the notes specifically state it, I
||> ||believe that table
||> ||for the construction loads is for when the deck is
||> ||UNATTACHED.  I could be
||> ||wrong, but I find it difficult to believe that a 200 lb man could
||> ||overstress a overspanned deck after it has been in place.  I
||> ||would imagine
||> ||that the situation that they are envisioning is after the
||> ||deck pieces have
||> ||been laid out on the framing and the construction worker is
||> ||walking around
||> ||either welding, screwing, or "shooting" the deck with 
||powder/pnuematic
||> ||fasteners.
||> ||
||> ||Scott Maxwell, PE, SE
||> ||
||> ||
||> ||On Fri, 21 Jul 2000, c2 wrote:
||> ||
||> ||>     <<  I believe that the table that you are looking at
||> ||("Recommended
||> ||> Maximum Spans for Construction and Maintenance Loads
||> ||Standard for 1 1/2" and
||> ||> 3"Roof Deck") is for loads during construction to 
||prevent damage.  I
||> ||> certainly could be wrong.  >>
||> ||>
||> ||> You could very well be right on the money.  I note that
||> ||stress is limited to
||> ||> 26ksi, deflections to L/240 with a 200 pound (man?)
||> ||concentrated load at mid
||> ||> span on a 12 inch wide section of deck.  I find the double
||> ||criteria a bit
||> ||> confusing.  I would guess that the published maximum spans
||> ||would be similar
||> ||> to a metal building roof panel wherein workers can only
||> ||walk on top of the
||> ||> supporting roof purlins.  One cannot help but wonder 
||how the roofing
||> ||> materials are applied in some of these instances.
||> ||>
||> ||> Thanks for your thoughts on this matter.
||> ||>
||> ||>
||> ||> Jimmy  C.......(hisself)
||> ||>
||> ||>
||> ||>
||> ||>
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