Building a concrete wall question

Posted by Alpha One on July 18, 2006, 1:54 pm

I want to build a concrete wall that is 56.5 ft long and 4 ft high from the
top of the wall to the bottom of the trench, that is, total height including
the footing. The wall will be 10 in wide and the footing will be 20 in wide
by 8 in. (or 10) deep.
It will take 7.5 yards for both the wall and footing. The footing alone will
take about 2 yards. If they bring 7 yards will be chipper that if I order 2
plus 5.
Then, I would have to pour footing and wall at the same time. Would the
concrete stay in the forms up to a height of 4 ft? Or would if flow out
through the bottom?
Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
the lower side?

Than you

Posted by Glenn on July 18, 2006, 2:21 pm

A 10" thick wall seems a little heavy but I assume you have your
reasons. Pour the footing the day before forming the wall and I
would use (hire or rent) metal forms with regular form ties. That
would not only be easier, but cheaper than all the form lumber it
would take. Put the footing deep enough to allow you to use 4
foot forms and of course pour them full to screed off the top. I
would use 24" wide footings. If this is a retaining wall and it
sounds like it could be, I would go with at least 36 inch wide
footings. With your questions, I can see a disaster if you don't
use this method. Three feet of fall in 56 feet will be manageable
though I would use a slight slump, ie fairly dry. I assume you
plan on using steel rebar too.

>I want to build a concrete wall that is 56.5 ft long and 4
> ft high from the top of the wall to the bottom of the
> trench, that is, total height including the footing. The
> wall will be 10 in wide and the footing will be 20 in
> wide by 8 in. (or 10) deep. It will take 7.5 yards for both the
> wall and footing. The
> footing alone will take about 2 yards. If they bring 7
> yards will be chipper that if I order 2 plus 5.
> Then, I would have to pour footing and wall at the same
> time. Would the concrete stay in the forms up to a height
> of 4 ft? Or would if flow out through the bottom?
> Also, since the wall slopes by 3.5 ft over 56 ft, will
> the concrete run to the lower side?
> Than you

Posted by Jonny on July 18, 2006, 11:23 pm

>I want to build a concrete wall that is 56.5 ft long and 4 ft high from the
>top of the wall to the bottom of the trench, that is, total height
>including the footing. The wall will be 10 in wide and the footing will be
>20 in wide by 8 in. (or 10) deep.
> It will take 7.5 yards for both the wall and footing. The footing alone
> will take about 2 yards. If they bring 7 yards will be chipper that if I
> order 2 plus 5.
> Then, I would have to pour footing and wall at the same time. Would the
> concrete stay in the forms up to a height of 4 ft? Or would if flow out
> through the bottom?
> Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
> the lower side?
> Than you

Works out to .75" per foot fall/rise. That's steep enough for guaranteed
drainage leaving solids behind the wake.

Consider stairstepping every 10'.
Depending on the soil content and how deep you go, the footing may walk.

Pour the footing first. Leaving some rebar exposed to tie it to the wall
above it.
--
Jonny

Posted by Nehmo Sergheyev on July 19, 2006, 12:38 am

Alpha One wrote:

> I want to build a concrete wall that is 56.5 ft long and 4 ft high from the
> top of the wall to the bottom of the trench, that is, total height including
> the footing. The wall will be 10 in wide and the footing will be 20 in wide
> by 8 in. (or 10) deep.
> It will take 7.5 yards for both the wall and footing. The footing alone will
> take about 2 yards. If they bring 7 yards will be chipper that if I order 2
> plus 5.
> Then, I would have to pour footing and wall at the same time. Would the
> concrete stay in the forms up to a height of 4 ft? Or would if flow out
> through the bottom?
> Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
> the lower side?

Learn a bit about concrete; then re-plan the job. You seem to be
planning a retaining wall to retain a sloping grade, probably on the
side of a residential lot. The first step is to accurately survey the
site. Determine where you want the wall. If you want it on your side of
the property line, determine where the line is. Then using a water
level, figure out exactly how much difference there is in height from
one end of the line to the other. Then, find out how low frost footings
are supposed to be in your area. --- That's enough for now. Report
back.

--
(||) Nehmo (||)

Posted by Dan Deckert on July 19, 2006, 1:05 pm

> I want to build a concrete wall that is 56.5 ft long and 4 ft high from

the

> top of the wall to the bottom of the trench, that is, total height

including

> the footing. The wall will be 10 in wide and the footing will be 20 in

wide

> by 8 in. (or 10) deep.

I'd have to believe your footers are undersized.
Dan

> It will take 7.5 yards for both the wall and footing. The footing alone

will

> take about 2 yards. If they bring 7 yards will be chipper that if I order

> plus 5.
> Then, I would have to pour footing and wall at the same time. Would the
> concrete stay in the forms up to a height of 4 ft? Or would if flow out
> through the bottom?
> Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
> the lower side?
> Than you

Page 1 of 3 1 2 3 > last >>

Similar Threads	Posted
attaching xps to interior concrete wall, how?	November 25, 2006, 11:55 am
Building Materials & Concrete Accessories	May 14, 2009, 2:10 am
Cheap-n-dirty shelving for concrete wall?	February 16, 2007, 6:58 am
Brick Seat Wall on concrete slab?	July 12, 2007, 3:03 pm
concrete bond beam over brick wall	August 17, 2007, 9:35 pm
Repair of Crack in Concrete Foundation Wall	October 14, 2007, 3:39 pm
Need help to remove pvc pipe embedded in concrete wall.....	February 24, 2008, 3:02 pm
is -this- a 'tilt-up' concrete building? (pix) I need to cut the doorway bigger...	July 1, 2007, 3:57 pm
Shear wall question	October 12, 2006, 12:49 am
question about wall insulation	December 11, 2007, 6:43 am