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overhang values

overhang values

overhang values

(OP)
For a porch roof (all is open), is it appropriate to apply overhang values for design of the rafters/ trusses and connections?  If not, what would be appropriate?  I believe that we would need to account for positive pressure on the underside of the roof (or porch ceiling) and negative pressure on the top side of the roof deck.  I have always treated this as an overhang condition, but would like to know how others treated this condition.

Thanks,

Rob

RE: overhang values

You need to check for both --- say a downward live and dead load and/or an upward wind live load.  Also - you need to be carefull at the edges of the buildings for higher loads.  Check out IBC2006 or ASCE

RE: overhang values

(OP)
I understand that I need to check for all of these.  My real question is this: Are the components and cladding "overhang" (simplified method-the table) values appropriate?  These are very high and these are what I have always used when designing for uplift.  Should I use an analytical procedure and treat this as an open structure? I am just curious as to what other engineers use.

Thanks, Rob

RE: overhang values

I would use analytical procedure as an open structure.  I routinely use that for aluminum canopy structures (similar to your application, different materials).

RE: overhang values

(OP)
Thanks Ron

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