Building a shed 10x20x8' high. never built a concrete roof but would like to over hang 2 feet on three sides. I'm a builder without this experience.
Can someone tell me the layout of 3/8 rebar to get the job done. 3.5" thick. 4x4abc - 10-29-2019 at 04:33 PM
that is too easylarryC - 10-29-2019 at 04:37 PM
I've never done one either but my father had a block garage built at his place at Cabo Pulmo and as I remember there was lots of rebar like 1/2" on 4
or 6" centers criss crossed. I did a garage some years ago here in BoLA, a 75' x 25' and framed the roof and then put metal laminate on it I'm sure
the roof will outlive me and that's all I care about. If you are in an area where there are lots of subterranean termites then you might want to use
treated lumber. If you do a concrete roof you won't have to worry about termites so there is something to be said for going the extra mile.StuckSucks - 10-29-2019 at 04:56 PM
That calculator is for a slab.
The op wants to build a concrete roof with 20 ft span.Timo1 - 10-29-2019 at 06:45 PM
Just get a good local mason to do it
Simple we didBajaTed - 10-29-2019 at 07:56 PM
Suggest a 15 degree roof pitch for your shed.
20' - 6"x6" rebar beam with single center post support for the concrete roof BajaUtah - 10-30-2019 at 07:57 AM
We did 30"x12" foam block and 8"x12" 1/2" rebar beam. Open garage space is 40' x 20'. Admittedly my contractor loves to over build but made it through
Odile and Lorena here in La Ribera easy peasy.
[Edited on 10-30-2019 by BajaNomad]4x4abc - 10-30-2019 at 08:47 AM
since the slab rebar is not embedded in the concrete it serves no function
but the predictable corrosion won't weaken the bunker since the beams will last 1,000 years (IF the concrete has been vibrated correctly)
since the slab rebar is not embedded in the concrete it serves no function
but the predictable corrosion won't weaken the bunker since the beams will last 1,000 years (IF the concrete has been vibrated correctly)
rebar should have been in center of concrete, and at least 2 inches from edge of pour.
concrete needs to be a correctly mixed and properly cured to last.
bad mix or bad cure and concrete will not achieve adequate strengthTimo1 - 10-30-2019 at 07:03 PM
Goat
You are just a wealth of knowledge4x4abc - 10-30-2019 at 07:33 PM
rebar should have been in center of concrete, and at least 2 inches from edge of pour.
the center is the last place where you want the rebar
rebar is either at the bottom or at the top - sometimes both
depends on where the stress will occur
any decent engineer can provide a simple plan for that
remember, concrete can absorb a lot of pressure
but it will not withstand pulling or shearing forces
the embedded steel will absorb those forces
together they are a strong team
IF the rebar is placed where those forces occur 4x4abc - 10-30-2019 at 07:45 PM
if the rebar would be placed at the center of a roof slab, the tension forces would not be absorbed - only bars at the bottom can do that (in this
simple example)
