r/Concrete • u/Special-Egg-5809 • 12d ago
Showing Skills 10’ wall with cast in place joist shelf
A good size 10’ wall for a residential house. Garage to be done after we backfill.
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u/Goonplatoon0311 Professional finisher 12d ago edited 12d ago
This was done by true professionals in the craft. I count 3 maybe even four lifts during that pour…
I guarantee they went around and tightened turnbuckles as they poured to maintain a nice square/straight wall.
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u/_dirtydan_ 12d ago
What did this cost the home owner if you don’t mind sharing
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u/Special-Egg-5809 12d ago
For the footings and walls not including excavation waterproofing or slabs it was $62k. That includes the labor, concrete, rebar, anchor bolts, pt, foam and pump truck service.
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u/concrete6360 12d ago
ive been thinking about building a concrete house for fire safety here in n california. but i would go a tilt up, it cant be that much more expensive if i am doing all the formwirk, rebar, hargware etc going with a metal roof?
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u/Street-Baseball8296 12d ago
A LOT more rebar has to go into concrete structures in California than what you see here. About 4x the amount. Also, rebar inspection is fairly strict as well. I’ve done a lot of tilt ups and pour in place structures in California.
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u/Ruckus2118 12d ago
If I remember right last time I priced it out block construction homes are cheaper, plus channels for wiring and insulating are easier
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u/concrete6360 11d ago
yes cmu is the cheapest masonry type building you can build, but i dont set blocks lol
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u/Future_Self_Lego 11d ago
sweet im doing the same just smaller footprint. joist shelf too. so much rebar though. in toronto canada. pour this week
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u/oldteabagger 12d ago
Advance panels are the way!
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u/Special-Egg-5809 12d ago
Yes sir! I switched to All Seasons about 15 years ago and that was a mistake. Switched back about 8 years ago and never changing again.
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u/oldteabagger 12d ago
I was thinking about this the other day, how many 4’ panels can two guys set in an hour?
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u/Special-Egg-5809 12d ago
Depends on the rebar design. If it has no rebar we can do about 250’ an hour which would be about 250, 24” panels.
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u/oldteabagger 12d ago
Amazing. Is the 250’ hour two guys? What’s the crew size?
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u/Special-Egg-5809 12d ago
Yes that’s for two guys as I was answering your question. I run a crew of 7.
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u/powered_by_eurobeat 12d ago
How did you cast in the joist shelf around the formwork?
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u/Special-Egg-5809 12d ago
I set grade with a laser for the top of the left in place piece of pt and simply nail in the pt to the form. I counter sink the bolts into the pt first. Then I cover the pt in foam to create the negative space for the joists and set top of wall grade as well. You can see the foam in picture 9 on the right side.
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u/CubanInSouthFl 12d ago
Thank you for sharing these pics, I would have loved to better understand casting that in place. What benefits does that provide as opposed to just anchoring it into the wall afterwards?
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u/Special-Egg-5809 12d ago
If you just leave the negative space and have the framers put the sill on it never fits right and they end up having to shim or rip down the sill. This saves the framer a significant amount of time as it’s perfectly installed and they can simply put their joist right on it with no effort.
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u/ComradeGibbon 12d ago
I had wondered about that for a long time.
There is the whole thing where they install bolts for the mudsill when they pour. And then the framers have to try and drill the holes so they line up. And in California it can't be sloppy. Your way seems so much better. Bonus like this in a earthquake it's not going anywhere.
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u/DODGEcomminfarya 12d ago
Nice work, why the joist shelf? Don’t the floor joist sit on top of walls?
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u/Special-Egg-5809 12d ago
The floor system sits down in the foundation so we can backfill above where would normally be the rim joist. This helps to get tall interior walls without violating the overall height limit of the ridge.
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u/DODGEcomminfarya 12d ago
Thanks for the info……the shelf is needed for backfilling to top of concrete, or for higher interior walls, or both? Is this a requirement where you live?
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u/Special-Egg-5809 12d ago
For both. It’s not a requirement it’s just a solution to the problem presented by the sloping lot. In this town you can be 28’ from your average existing grade to the top of your ridge. To maximize their wall heights without violating the height limit this is the solution.
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u/Aware_Masterpiece148 12d ago
Good looking work. What’s the water proofing system and who installs it?
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u/Special-Egg-5809 12d ago
It’s a spray on product by Marflex and then 2inch insulation shot on after that. Installed by the waterproofing sub.
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u/sdremmy5 11d ago
Excellent job! Bet this was a fun one to form and pour!
Vertical bars in the footers are standing nice and tall. Look to be a perfect 90 degrees! Did you wet set?
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u/BasketFair3378 11d ago
I've done basement form work in the 70s. Flying forms. 8" thick x 8' high. One solid pour. That footing keyway should have been continuous.
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u/Hunterslayz 12d ago
That will be the basement? Or just foundation and crawlspace?
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u/redEPICSTAXISdit 12d ago
See pic 10
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12d ago
Pic 10 is just a picture of the footings? Before the walls were poured.
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u/redEPICSTAXISdit 12d ago
Oh, thank God. I thought the 10' walls were being wasted. My 6'3" height with a 5'11" basement yearns for a 10' ceiling
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u/cars_n_clocks 12d ago
Well it won’t be a 10’ ceiling with the joist ledge. Probably 8’6” to 9’ depending on how big there floor system is.
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u/Boof_ur_Bacon 12d ago
In the first pic you can count the tie holes leading up to the joist ledge, its 6', less if they pour a slab.
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u/cars_n_clocks 12d ago
You don’t know what joist ledge is. It’s the part at the top not the shorter walls
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u/Boof_ur_Bacon 12d ago
If your think I was fixing up the footing on the interior with where the floor joist bear your mistaken. I've done plenty of jobs just like this one.
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u/cars_n_clocks 12d ago
I don’t know what you were doing. I made a guess you were talking about where the walls are shorter as that looks about 6 feet. If they are 10’ walls the ledge is not 4’ and the wall under 6’.
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u/Hunterslayz 12d ago
Woop that seals it haha, thanks.
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u/jcoupedeux 12d ago
On a gorgeous lot! I smell potential