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 11-12-2012, 08:55 AM   #1
Member
 
Join Date: Oct 2011
Location: US
Posts: 48
Share |
Question

Parging - Need help


I attempted to parge my cold storage room, which right now is ugly poured concrete. The house was built two years ago, so the concrete is in pretty good shape. I haven't observed any moisture issues.

Here's what I did: I broomed off the wall, hammered off some parts that were sticking out too much. Then I got some "Type S" mason mix, mixed it with water until it was a peanut butter like consistency. Then I sponged/sprayed the wall until it was damp, but not wet. I troweled it 1/4" or so onto the wall, working it until it was fairly smooth. Then I waited a bit until it hardened, and I used a sponge to scrub it smooth.

When I came back half an hour later (or so) I noticed several cracks had developed. I checked them, and it looked like the coat had detached from the concrete wall. So I removed it all, because obviously I didn't do it right.

What did I do wrong? I can't seem to find enough information on how to do it properly. Was my mix not wet enough? Was brooming off the wall and removing lose dirt not sufficient? Should I have done a "slurry coat", or should I have used some adhesive on the wall (if so, what would I look for in a typical home improvement store?)? Did I use the wrong trowel? Did I work it too much by trying to smooth it out right away?

I appreciate any help.
Attached Thumbnails
Parging - Need help-dsc_0181-medium-.jpg   Parging - Need help-dsc_0182-medium-.jpg  

TomU is offline   Reply With Quote
Old 11-14-2012, 08:49 PM   #2
Member
 
Join Date: Oct 2011
Location: US
Posts: 48
Default

Parging - Need help


Does nobody have any advice for me?

TomU is offline   Reply With Quote
Old 11-15-2012, 07:46 AM   #3
Member
 
Join Date: Jul 2011
Posts: 790
Default

Parging - Need help


Interested in an answer as well. I'd like to this or something similar to a basement wall that can't be framed.
mikegp is offline   Reply With Quote
Old 11-15-2012, 11:00 AM   #4
Member
 
Join Date: Jun 2009
Location: Somerset, England
Posts: 678
Default

Parging - Need help


If I was doing the job I would give the concrete a coat of 3/1 water/PVA first and wait till it was tacky.
Then give it a scratch coat of 1/1/4 lime/OPC/sand.
Then a top coat of 1/1/5 lime/OPC/sand. Use plastering sand as there is less shrinkage.
stuart45 is online now   Reply With Quote
Old 11-15-2012, 01:25 PM   #5
Member
 
Join Date: Mar 2006
Location: Austin, TX
Posts: 1,204
Default

Parging - Need help


You can use a bonding agent alone (make sure it is a re-emulsifiable bonding agent) painted on the wall, you can use a slurry as mentioned above (but have to work fast or it will become a bond breaker), or add bonding agent to the mix. At 1/4" thick, you are pulling it off the wall when you work it with the trowel, so aim for 3/8" and just get it spread out don't over work it. The cracks are shrinkage cracks from too much moisture in the plaster, probably from wetting the wall.
__________________
Advice is free, Lessons begin at 75 bucks an hour.
Tscarborough is offline   Reply With Quote
Old 11-15-2012, 01:40 PM   #6
Member
 
Join Date: Oct 2011
Location: US
Posts: 48
Default

Parging - Need help


Quote:
Originally Posted by Tscarborough View Post
You can use a bonding agent alone (make sure it is a re-emulsifiable bonding agent) painted on the wall, you can use a slurry as mentioned above (but have to work fast or it will become a bond breaker), or add bonding agent to the mix. At 1/4" thick, you are pulling it off the wall when you work it with the trowel, so aim for 3/8" and just get it spread out don't over work it.
Thanks for the tips. I think my mistake was that I put on too much and overworked by trying to make it the final coat right away. I'm also thinking that the mix was maybe too dry.

Quote:
Originally Posted by Tscarborough View Post
The cracks are shrinkage cracks from too much moisture in the plaster, probably from wetting the wall.
I don't think they were shrinkage cracks because these areas were completely detached from the concrete wall behind it.

I'll get a wire brush to try and roughen the surface a bit and then I'll try a slurry coat, followed by a thinner base coat. Then I'll wait until the base coat is hardening and scratch it horizontally. Then wait a day or two before putting on the final coat. When putting on the final coat, same consistency as the base coat? And wait until it hardened a bit before working it with a trowel and sponge?

TomU 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
repairing parging on block foundation bubbler Concrete, Stone & Masonry 3 03-08-2012 05:09 AM
Question Re. Parging Over Brick Captain.Sassy Building & Construction 19 06-22-2010 08:50 AM
parging concrete walls newzev Tools 7 07-27-2009 01:54 AM
removing concrete parging from basement foundation walls. newzev Remodeling 1 07-24-2009 08:17 AM
Am I parging or cementing or what? Dusty Building & Construction 14 04-11-2008 12:03 AM




Top of Page | View New Posts

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