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-   -   Best way to fill big hole in foundation (http://www.diychatroom.com/f105/best-way-fill-big-hole-foundation-172841/)

noquacks 02-24-2013 01:03 PM

Best way to fill big hole in foundation
 
Guys,

have a garage which is walk out- back part of it is entirely underground (its against a hill). Previous owners cut a 3x3' hole in the back of the garage into this foundation. It gave them an extra 2' or so so they could store their dumb boat entirely inside. Sheesh.

Now, I wish to repair . The thickness is about 10". It shows rebar cut- 2 vertical, and one horizontal. Do I need to replace rebar (drill, slide in), or can I makie a form and pour 5000 psi concrete without rebar? (will try to post a picture soon....)

Thanks!

joecaption 02-24-2013 01:09 PM

How lucky are you.
Look up Core Drilling or Concrete cutting in the phone book.
It's a long shot but they may be able to set you up with plug that they have removed or know where there's one laying around.
I'd be using hydrolic cemet not concrete if you can not find a plug.
Hydrolic will expand and lock in place better.

noquacks 02-24-2013 01:10 PM

1 Attachment(s)
picture of the hole attached -

joecaption 02-24-2013 01:22 PM

I was picturing a round hole.
Best way would be to remove some of the blocks left in place so there would be a running bond to lock the new ones in place.

noquacks 02-24-2013 01:34 PM

OK, thanks, Joe, but theres no blocks- its not a cement block foundation, its poured. But I like the idea of hydrolic cement. I can mix/pour that and use no rebar?? HD sell it?

noquacks 02-24-2013 01:36 PM

Also, was hoping to be able to pour in multiple pourings, so less weight per pour. Say, if I didnt have the plywood held in tightly enough, and the whole slurry mess falls out all at once!!! Can I pour it say, in 3 pourings (where I would be dealing with a limited mix/slurry, say, only a foot high?)

Fix'n it 02-24-2013 03:28 PM

hang a picture over it.

funfool 02-24-2013 04:20 PM

just my thought, I would put some rebar in it, try to tie it back into the original foundation.
Just drill 6-8" into the concrete. maybe 2 on top, bottom, left and right.
Would be 8 holes and 8 pieces of bar using tie wire to connect.
Maybe someone else can add to the rebar idea, but at very least I would do that.

Will be interesting on how you form that and pour in the cement. probably will want to chip out some sort of access hole on top, attach a piece of plywood to the wall and pour concrete through the access hole you created.
The problem will be the weight as you suggest, will not be able to fasten the plywood to the wall strong enough to hold while it sets up.

Do you have a 4x4 pickup with the bumper at the right hight? Mount the plywood to the wall, then back the truck up into the plywood to hold it in place, can stand in the bed and pour the concrete in?

noquacks 02-24-2013 04:31 PM

Quote:

Originally Posted by funfool (Post 1124000)
just my thought, I would put some rebar in it, try to tie it back into the original foundation.
Just drill 6-8" into the concrete. maybe 2 on top, bottom, left and right.
Would be 8 holes and 8 pieces of bar using tie wire to connect.
Maybe someone else can add to the rebar idea, but at very least I would do that.

Will be interesting on how you form that and pour in the cement. probably will want to chip out some sort of access hole on top, attach a piece of plywood to the wall and pour concrete through the access hole you created.
The problem will be the weight as you suggest, will not be able to fasten the plywood to the wall strong enough to hold while it sets up.

Do you have a 4x4 pickup with the bumper at the right hight? Mount the plywood to the wall, then back the truck up into the plywood to hold it in place, can stand in the bed and pour the concrete in?

These are some solid (pun?) idea! Yes, you get what Im talking about regarding all the weight pushing "back" out, ifn one pours ALL the slurry at once. All I have is a small car. But Im gonna figure it out. Need lots of weight against the plywood .......3 pours could do it.

yes, could drill and tie in rebar somehow.

funfool 02-24-2013 04:47 PM

Go to home depot and rent a bulldog, will need it to drill the holes for the rebar, and also want a chipping bit to make the access hole to pour the concrete in, and again to install fasteners to bolt the plywood to the wall. You really are going to want a hammer drill for this project.

But holding the plywood form is going to be a creative process.

vsheetz 02-25-2013 12:37 AM

Quote:

Originally Posted by Fix'n it (Post 1123973)
hang a picture over it.

:thumbsup:

Agree it's awkward, but what problem is the hole causing?

noquacks 02-25-2013 03:21 PM

Quote:

Originally Posted by vsheetz (Post 1124335)
:thumbsup:

Agree it's awkward, but what problem is the hole causing?

Right now, no problem. Maybe I could/should live with it? Also, say I want to sell the house- it would be a bad selling point.

Canarywood1 02-25-2013 04:57 PM

Quote:

Originally Posted by noquacks (Post 1124695)
Right now, no problem. Maybe I could/should live with it? Also, say I want to sell the house- it would be a bad selling point.


All you need to do with that is fill it with grout in 2 lifts,and your good to go,no steel required,just keep the grout on the stiff side.

noquacks 02-25-2013 05:37 PM

Quote:

Originally Posted by Canarywood1 (Post 1124752)
All you need to do with that is fill it with grout in 2 lifts,and your good to go,no steel required,just keep the grout on the stiff side.

really? Grout? Like tile grout for ceramic tiles? No rebar? Is that cuz tile grout is soooo strong? Man if that works, Im all for it!

Canarywood1 02-25-2013 06:16 PM

Quote:

Originally Posted by noquacks (Post 1124786)
really? Grout? Like tile grout for ceramic tiles? No rebar? Is that cuz tile grout is soooo strong? Man if that works, Im all for it!



Concrete grout,a sand and cement mix,and when you get it poured tap the form board a half dozen times to ensure a nice smooth finish when you remove the board.


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