Hello,
Here's what I have; 50 year old construction. 2x4 trusses, spaced 22" centers (2nd floor). Running 28ft in length with a beam in the middle (14ft).For my ceiling I have nailed up 1" blueboard (Hard Styrofoam) directly to the 2x4 trusses.Getting ready to hang my sheetrock. I have screwed in 1x4 furring strips every 16". My plan is to screw the 5/8 sheetrock into the furring strips.Question being: will my ceiling handle the weight?

Why 5/8 drywall? Code required? Normally, 5/8" X rated is only required if there is habitational space above.What is the purpose of the blueboard? This is an attic space above? Why furring strips, run the drywall across the trusses, furring adds weight.

Hello, 5/8 is code, Not to mention I have more than 16" centers. Bluebird is to add insulation Value.
Straps (furring strips) are much easier to nail to than trusses. Project is done. Everything is satisfactory.

Alaska

thanks for your help. :-)