Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-09-2011, 11:35 PM   #1
Newbie
 
Join Date: Jun 2011
Posts: 1
Share |
Default

Pouring new concrete over existing


I would like to enclose my carport, there is existing concrete which is about 50 yrs old and has a few cracks. I would like to raise it up 3 inches to meet with the house foundation. Will it be okay to pour over the old? Also I have 3 6X6 support posts that are anchored to the concrete, will I be able to pour around these and make them permanent in the foundation?
dalebert is offline   Reply With Quote
Old 06-10-2011, 12:29 AM   #2
Newbie
 
Join Date: Mar 2011
Location: Los Angeles
Posts: 18
Default

Pouring new concrete over existing


When new concrete touches old concrete the old will absorb the new concrete's water content, which would cause the new concrete to not cure correctly. At the same time, cracking will occur due to the fact that the two will not bond as one. Since this is a carport and is heavily loaded, cracks will occur.
The existing wood column should not touch the concrete as it will deteriorate if you bury the column into the concrete.
luckattack is offline   Reply With Quote
Old 06-10-2011, 12:30 PM   #3
Member
 
Join Date: Mar 2011
Location: San Mateo, CA
Posts: 77
Default

Pouring new concrete over existing


What if there is a layer of that concrete adhesive stuff between old and new concrete?
Vincer is offline   Reply With Quote
Old 06-10-2011, 12:37 PM   #4
Newbie
 
Join Date: Mar 2011
Location: Los Angeles
Posts: 18
Default

Pouring new concrete over existing


You are talking about the bonding agent where you would need to prep the existing slab by roughening it with 1/4" amplitude. If it was a walking slab, I might consider it since you are putting in 3" but for a carport I wouldn't try due to the loading. Also, again there will be cracking and the two will separate. Not recommended.
luckattack is offline   Reply With Quote
Old 06-13-2011, 08:27 PM   #5
Newbie
 
indel's Avatar
 
Join Date: Jun 2011
Location: Pinewood Estates, 10 miles West of Beaumont, TX
Posts: 3
Default

Pouring new concrete over existing


As it happens, I intend to do the same. Over a 4 inch slab, I will set a metal mesh and poor concrete to make a supplemental 4 inch. I have googled this subject and the answers are, mostly, afirmative. The treatement of the existing slab will solve the problem at the interface. Talk to an experienced contractor.
indel 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
Pouring a concrete pad ryan5068 Building & Construction 7 04-24-2011 02:20 PM
wooden stairs on existing concrete stairs ThaboG Carpentry 7 08-06-2010 09:03 AM
New Floor Drain in Existing Concrete Floor JPWMU Plumbing 3 04-21-2010 05:51 AM
4x4 posts on top of existing concrete pad qcliffy Building & Construction 7 12-26-2009 09:54 PM
Considerations when pouring concrete against a stucco wall? clint_nichols Building & Construction 9 09-24-2009 05:28 AM




Top of Page | View New Posts

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