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This Is What I Cut My Teeth On

 
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Old 10-15-2018, 10:11 PM   #21
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Re: This Is What I Cut My Teeth On


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Originally Posted by griz View Post
sand acts as a wick for moisture.

haven't seen sand called out under a slab in 5 years or so.

can't even recall the last time i saw plastic called out.

very common to see vapor barriers like stego called out.

residential guys even using stego type barriers.

imo, it is the new rh standard floor companies are using to determine slab moisture content.
yup
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Old 10-15-2018, 10:19 PM   #22
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Re: This Is What I Cut My Teeth On


Last structural slab I poured was about 6 years ago.


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Old 10-15-2018, 11:49 PM   #23
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Re: This Is What I Cut My Teeth On


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Originally Posted by Californiadecks View Post
Called out on every one of my residential structural slabs. Sand, plastic, and more sand.

Commercial was oftentimes class 2.


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That's how we used to call it out and do it but that's old school, not allowed for new construction per the current CalGreen building code. They want the vapor barrier directly under the concrete with crushed rock as a capillary break under that.

I think the stego stuff that Griz mentioned is what we've been looking for, we had it, lost it, couldn't find it and have been calling out 20 mil or 10 mil plastic. It tears but according to the building science dude a few tears don't matter as long as it's not totally shredded. He wrote an article about this newer way to detail out slabs and mentioned the sand/plastic/sand technique and said in actuality it's a terrible way to do it as it can trap moisture.....
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Old 10-15-2018, 11:59 PM   #24
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Re: This Is What I Cut My Teeth On


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Originally Posted by Rio View Post
That's how we used to call it out and do it but that's old school, not allowed for new construction per the current CalGreen building code. They want the vapor barrier directly under the concrete with crushed rock as a capillary break under that.



I think the stego stuff that Griz mentioned is what we've been looking for, we had it, lost it, couldn't find it and have been calling out 20 mil or 10 mil plastic. It tears but according to the building science dude a few tears don't matter as long as it's not totally shredded. He wrote an article about this newer way to detail out slabs and mentioned the sand/plastic/sand technique and said in actuality it's a terrible way to do it as it can trap moisture.....


Sand plastic and sand, was a thing for 30 years that I can remember. Damn, it's like coffee, first it's bad then it's good then it's bad again.


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Old 10-16-2018, 07:13 AM   #25
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Re: This Is What I Cut My Teeth On


My old flatty used wood stakes with two nails on top to hold 1-1/4” piece of pipe. He set the corner stakes with a laser then used a sting to set the other stakes. Grade stakes were used to grade sand and screed the concrete just like these things.
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Old 10-16-2018, 10:01 PM   #26
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Re: This Is What I Cut My Teeth On


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Originally Posted by Californiadecks View Post
Sand plastic and sand, was a thing for 30 years that I can remember. Damn, it's like coffee, first it's bad then it's good then it's bad again.


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That's what we always did too, makes perfect sense. 2" sand, 6 mil visqueen which the sand protects on the bottom, 2" more sand on top which protects it again and also allows the sand to be wetted to slow the crete curing but yeah, it's a big no no now.

When that science building dude, Joe complicated last name, started going on about how that's a perfect way for a lot of bad things to happen I remember thinking ,'now we're definitely going to be screwed', but nothings ever come up and hopefully nothing ever will but we don't do it the old way any more.
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Old 10-16-2018, 10:05 PM   #27
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Re: This Is What I Cut My Teeth On


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Originally Posted by Rio View Post
That's what we always did too, makes perfect sense. 2" sand, 6 mil visqueen which the sand protects on the bottom, 2" more sand on top which protects it again and also allows the sand to be wetted to slow the crete curing but yeah, it's a big no no now.



When that science building dude, Joe complicated last name, started going on about how that's a perfect way for a lot of bad things to happen I remember thinking ,'now we're definitely going to be screwed', but nothings ever come up and hopefully nothing ever will but we don't do it the old way any more.


I never thought I'd see the day I was uniformed about slab work. Damn, I feel less than.


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Old 10-16-2018, 10:07 PM   #28
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Re: This Is What I Cut My Teeth On


Quote:
Originally Posted by Californiadecks View Post
Last structural slab I poured was about 6 years ago.


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doubtful you poured a structural slab.

they require huge grade beams, unreal amounts of steel and like 4500 psi concrete.

mix design & slab design by a SE.

they are generally used due to a geo-tech report with a concern of seismic activity and liquefaction.
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Old 10-16-2018, 11:02 PM   #29
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Re: This Is What I Cut My Teeth On


Quote:
Originally Posted by griz View Post
doubtful you poured a structural slab.



they require huge grade beams, unreal amounts of steel and like 4500 psi concrete.



mix design & slab design by a SE.



they are generally used due to a geo-tech report with a concern of seismic activity and liquefaction.


Yep, it was structural due to expansive clay. Spec'd at 4500 . Had to have engineering including a field inspection of the soil after footings were dug. Also had to soak the soil first.

I will add it wasn't crazy structural, but structural none the less.


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Last edited by Calidecks; 10-16-2018 at 11:11 PM.
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Old 10-16-2018, 11:17 PM   #30
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Re: This Is What I Cut My Teeth On


Quote:
Originally Posted by Californiadecks View Post
Yep, it was structural due to expansive clay. Spec'd at 4500 . Had to have engineering including a field inspection of the soil after footings were dug. Also had to soak the soil first.

I will add it wasn't crazy structural, but structural none the less.


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my bad....

i ASSumed some info.....

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