Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Concrete, Stone & Masonry

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-26-2012, 08:02 PM   #1
Newbie
 
Join Date: Feb 2012
Location: South Dakota
Posts: 1
Share |
Default

Pouring new concrete around existing slab on grade.


Hey everyone,

So here is the deal. I have a slab on grade between my house and garage. This is a 3 season room/breezeway. We have water coming in when it rains hard. It only comes in at the sill board/slab interface and only in one low corner. The slab is actually below grade. This is an old house. So I assume it settled over time. The floor is tiled. And is crack free. We want to renovate this room anyways. So the walls are coming down this spring. But the roof is staying. So my idea is to pour new concrete around the existing slab. But the new pour will be higher than the existing. I was thinking 6 inches above the existing should be good. For a total of 9 inches (depending on how thick the slab is). I would pin the new to the old every 12 inches with rebar. Epoxy the rebar into the old. Then rebuild the walls in their original locations.

The questions:
1. Does this sound like a good plan? Or Is there something better?
2. What product do I use for the new to old slab connection to make it waterproof?
3. Is there a epoxy specifically made for the rebar connection?
4. Absolutely any advice would be great. I really want to do this right the first time.

Thanks everyone!

Supercontinent is offline   Reply With Quote
Old 06-19-2012, 11:20 AM   #2
Newbie
 
Join Date: Feb 2010
Posts: 4
Default

Pouring new concrete around existing slab on grade.


I am doing something similar to you project for 8' by 6' side porch in Florida built in 1985.

I am surprised that you had no replies so decided to write. Even if you have started/completed your Nebraska project.

My other home in Alabama built in 1965 has a 5' wide by 30' slab on the front porch with 4 14 foot wood columns with no footings and the slab has moved away from the house 1/2 inch in the +40 years. The house has brick veneer all around and its slab is 2.5 feet below grade. The front porch entry way described above does not look too bad. Slabs not properly attached will creep.

You mentioned rebar. I am thinking of using rebar in my 8' by 6' project. I am adding concrete over an 8' by 6' side porch portion of the main house slab (all one slab if I recall the photos from 1985) to level it with the rest of the house. The rebar should help hold the new +3" concrete slab that I'm poring. Thinking of drilling the existing slab, placing rebar 1 1/2" into the new slab. Have not seen photos of using rebar in this way, to hold a 2nd slab in place.

I would not think that epoxy on the rebar would be that important, maybe some wire to hold it from falling thru, since the new slab would get a grip on it.

Your added 6" is to be above grade. Why is waterproofing the old to new slabs important?

12" spacing for the rebar sounds conservative, maybe you can do with less. I was thinking 6 rebar spikes for my 50sqft slab


8' by 6' and 3" or 4" deep is 12 or 16 cuft. Have read that < 27cuft of concrete can be done by hand by one DIY.

Will send photo of my project space if someone writes back.

illanrob is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cement backer board over kitchen concrete slab gtimk4 Flooring 2 02-19-2012 02:46 PM
Repairing concrete slab in shower JohnRoss Building & Construction 0 08-08-2011 01:20 PM
Concrete slab to foundation work tntgarv Building & Construction 3 02-28-2010 12:23 PM
pouring a level concrete slab over sloped concrete Jayne Building & Construction 4 05-11-2008 08:55 AM
Concrete slab weeps moisture dale h Flooring 2 04-30-2005 10:29 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.