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Question
I'm building a concrete shed with 8" filled CMU block walls and 12ft x 8ft interior roof span. The roof will be constructed 6inch thick concrete with #4 rebar grid 12inch OC. The load will be 6" dense dirt on top + 50psf snow load + 200lb person occasionally walking on it. Will my roof be strong enough?
Thanks..
Hi Tom, Using #4 rebar, I would go to 8" on center or up my rebar size to #5. The steel should be located close to the bottome of the slab using 1" chairs. Then I would install a top mat of temperature steel on 4" chairs, #4 @ 24" on center each way. Be sure to keep your 3000# minimum concrete slump low around 5" and use a mechanical vibrator to consolidate it during the pour. I hope this information helps, please feel free to write again regarding this or other matters, sincerely bruce e johnson..bejohnsonconsulting.com
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Answers by Expert:
Bruce E. Johnson
Expertise
I can answer any construction related question in regards to carpentry, concrete, drywall, masonry, structural elements of any type of building, residential or commercial. Interior or exterior.
Experience
Custom Commercial and residential buildings. Churches, theaters, schools and auditoriums. Most recently I am working with the Catholic Church on several design build committees. I have a website related to scheduling and project supervision. Although my expertise is more related to multimillion dollar commercial, educational and theatrical projects my generous credentials in residential and remodelling construction make me a viable source of information regarding all forms of building questions.
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