RFreund
Structural
- Aug 14, 2010
- 1,881
Is there somewhere I can find information regarding the strength of gypboard for out of plane bending strength.
Have a situation where the roof appears to have been constructed of bulb tee's and gypboard panels ((4) 1/2" sheets). The sheets are supported by bulb tees (@ 39" oc) on 2 edges and joists (@48" oc) on the other 2 edges. They want to put PV arrays on the roof with ballast blocks. Not sure it is possible but I've been on the roof and there is some strength there. I'd like to see if we can quantify that. Also lets set aside the fact that wet gypboard would obviously be not good.
I have found some properties here at the gypsum association but I'm not sure how to apply the Modulus of rupture to find an allowable bending stress (i.e. what factor of safety or even if an elastic stress distribution is reasonable to assume).
Any thoughts??
Thanks!
EIT
Have a situation where the roof appears to have been constructed of bulb tee's and gypboard panels ((4) 1/2" sheets). The sheets are supported by bulb tees (@ 39" oc) on 2 edges and joists (@48" oc) on the other 2 edges. They want to put PV arrays on the roof with ballast blocks. Not sure it is possible but I've been on the roof and there is some strength there. I'd like to see if we can quantify that. Also lets set aside the fact that wet gypboard would obviously be not good.
I have found some properties here at the gypsum association but I'm not sure how to apply the Modulus of rupture to find an allowable bending stress (i.e. what factor of safety or even if an elastic stress distribution is reasonable to assume).
Any thoughts??
Thanks!
EIT
