welding roof decking

[woodman90]

I need help on welding roof decking. Is there a code for this, and where would it be found? Also when are deck screws
needed?

 

[dik]

There is a Canadian code CSA 136-94 for the design of "Cold Formed Steel Structural Members" that can be used for determining strength. It also has information for the design of fasteners such as 'puddle welds' for load capacity.

There is also the Canadian Sheet Steel Building Institute and the US Steel Deck Institute that may have additional information.

 

[rmp319]

Woodman,

AWS D1.3 Structrual welding code - Sheet Steel will cover the issues for welding roof decking and qualifying welders. The use of sheet metal screws is usually covered in job specs and manufacturer's specs.

 

[wsiladi]

For horizontal loads imposed on the diaphragm, I suggest that you use the Steel Deck Institute's Diaphragm Design Manual. You will find differing strengths for deck gauge, span length, end fastening and side lap fastening that should correspond to the demand on the diaphragm and need to be stringently followed.

The second load case to consider is that of net wind uplift on the decking. Here you will need to consult either SDI, Manufacturer's catalogs, AWS or the American Iron and Steel Institute (AISI) Cold Formed Steel Design Manual to determine the demand in uplift.

Attached are a few links to the appropriate web sites:
SDI Publications:

http://www.sdi.org/manuals.htm

Vulcraft Deck Catalog (good resource):

http://www.vulcraft.com/catreq/deckcat.pdf

AISI Cold Formed Steel Design Manual:

http://odin.syscomsrv.com/aisishop/..._id=52&top_dept_id=2005&pf_id=SG02-1++SG02-2#

NJB/United Steel Deck catalog (gives tensile capacities for sheet uplift):

http://www.njb-united.com/usd/deckcat.htm