Wind uplift on the flat roof - C&C

[Buleeek]

Hello everyone,

I am currently designing roof cover layers on the flat concrete roof. To get the uplift acting on the roof layers (C&C), can I use the ASD combination from ASCE 7-10: 0.6D + 0.6W ?
Or should I go with "1.0*W" value of wind uplift, since the dead load (concrete roof) doesn't really hold the roof layers down (adhesive does)?

Thank you in advance,

Buleeek

 

[EDub24]

You should check all applicable load combinations whether they are LRFD or ASD.

Regarding the dead load, in this case I would use the minimum of the roof weight or the adhesive strength. For example if you have a 6" slab (75 psf assuming normal weight) but the adhesive strength is 10 psf then I would use a 10 psf dead load. I would also include the weight of the covers. So basically the adhesive strength + weight of the covers has to be more than the uplift force.