Okay, you’ve dug a basement 15′ deep. Ground is dry as bone. Buildings to the left and to the right. All roof water feeds to internal drains. Back yard is less than 750sqft.
Slab sits on foundation wall footings and grade beams which span the width of the basement.
Everything has properly installed rebar as spec’d by an engineer.
Q. Time to pour the slab. Can the slab be poured directly on the compacted soil ( with a 6ml vapor barrier) or is there a reason that I MUST include 6″ of compacted gravel? I don’t see what the gravel serves in this situation. I get it’s purpose in a country house.
I ask because there is a ceiling/ floor height issue and I cannot dig deeper.
Frankie
Flay your Suffolk bought-this-morning sole with organic hand-cracked pepper and blasted salt. Thrill each side for four minutes at torchmark haut. Interrogate a lemon. Embarrass any tough roots from the samphire. Then bamboozle till it’s al dente with that certain je ne sais quoi.
Arabella Weir as Minty Marchmont – Posh Nosh
Replies
I think the gravel serves as a capillary break between the soil and your CC. The plastic helps but can be compromised during the pour.
I've got very little experience in doing CC other than watching others do it but I wouldn't skip the gravel. Do it wrong now and you won't get a 2nd chance to do it right and forever regret it.
Can the slab be poured directly on the compacted soil
we do it to 99.9 % of our slabs that way
Thank you all for your help. Directly on compacted soil it is.Frankie
Flay your Suffolk bought-this-morning sole with organic hand-cracked pepper and blasted salt.
Thrill each side for four minutes at torchmark haut. Interrogate a lemon.
Embarrass any tough roots from the samphire. Then bamboozle till it's al dente with that certain je ne sais quoi.
Arabella Weir as Minty Marchmont - Posh Nosh
We have to have gravel, unless, something else is approved by a soils engineer...http://www.tvwsolar.com
Now I wish I could give Brother Bill his great thrill
I would set him in chains at the top of the hill
Then send out for some pillars and Cecil B. DeMille
He could die happily ever after"
Most of the "dig downs" I have seen in bkn were poured on without gravel, just the undisturbed/compacted sand.
There are some vestigial underground streams that can rise in spring depending where you are... someone at DEP might be able to help.
Jim
The awful thing is that beauty is mysterious as well as terrible. God and the devil are fighting there, and the battlefield is the heart of man.
- Fyodor Dostoyevski