Suspended Slab Framing Economics

[GreatDane2022]

Before spending days researching, I was wondering if anyone had advice for the most economical solution for a second story residential concrete slab. Currently have concrete girders and beams but considering k-series joists and metal decking. 23 x 50 foot span with plenty of headroom.

Thanks!

 

[XR250]

It is going to depend on your local market conditions, labor force and the current price and availability of materials. Steel is super expensive right now - especially decking.
Although, I imagine for a house like this, cost may not be an issue.

 

[GreatDane2022]

Seems like I am always fighting costs. Labor (cost and availability) and simplicity (complicated designs are rarely executed well in residential) are my driving factors. Seems like by using k-series and decking, I reduce complexity and labor dramatically associated with forming beams/deck and shoring. Materials...you may have answered my question.

 

[GreatDane2022]

Good, high-level article I found for future readers of this post.

https://www.aisc.org/globalassets/modern-steel/archives/2006/09/2006v09_deck_tips.pdf

 

[KootK]

Indoors? Outdoors? Transfer slab or uniform load?

XR250 is absolutely right about the economics being region specific. That said, at 23' span you should be able to make a uniformly loaded residential flat plate slab work at 8"-10" thick. You'd then be down to dirt simple formwork and concrete but no steel trade / order.

 

[KootK]

Depending on how badly you want that "institutional feel" maybe even wood floor trusses and a topped OSB/plywood deck.

 

[GreatDane2022]

Thank you XR250 and KootK. Market is crazy where I am so you both made me think of alternate points which is always good.

KootK - I am sharpening my pencil to consider your ideas. I ran flat plate a while back but have slept since then. Never considered truss/plywood because I assumed it would be crazy money with lumber prices as high as they are but can't hurt to know instead of assuming.

Thanks again!

 

[GreatDane2022]

Oh, indoor and uniform.