Parging Block

 
Thread Tools Search this Thread Display Modes
Old 07-12-2006, 04:52 PM   #1
Pro
 
lukachuki's Avatar
 
Trade: Customer Education & Development
Join Date: Feb 2005
Location: Aiken SC
Posts: 1,600
Rewards Points: 1,002

Parging Block


I'd like to hear opinions about the best way to parge concrete block. I have a couple of jobs here in the future like this and I'm not sure that the way I've been taught is the best.

Up to this point in my short career all I have done is 2 coats of type s mortar. 1st coat troweled on and then litely raked. 2nd coat applied the same way to the dried scratch coat and then a light sponge finish.

Is that pretty much the way most people do it? Is there some additive or mortar mix that works better?

What about painted block? I have a job coming up that the lady wants me to parge the new block as well as her old block foundation which was painted?

Hmm

Thanks,

Tim
lukachuki is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   
 

Old 07-12-2006, 05:49 PM   #2
Pro
 
Tscarborough's Avatar
 
Trade: Monkey Scratching Cat Herder
Join Date: Feb 2006
Location: Austin
Posts: 5,908
Rewards Points: 2,358

Re: Parging Block


When you say parging, do you mean to leave it as a decorative finish? I assume you do.

There are a couple of things to make a block wall take a stucco finish better.

First, when you are laying the block, do not tool the joints. This is the only time you will ever hear me say to not do this, but by not doing so, you will eliminate about 90% of the "wet lines" in damp stucco. Just strike them off flush.

Second, I always use an acrylic additive and (stucco grade) fiber mesh in both coats. To prevent a hairy finish, add the water (and color) to your mix water and stir well to break up clumps. Sometimes you will still get a few hairs, in which case you can burn them off with a heat gun if it is an issue.

As for the painted block, you will almost certainly have to use a mechanically adhered lath to do a suitable job, unless you remove the paint.

Tscarborough is offline  
Old 07-12-2006, 07:38 PM   #3
Pro
 
lukachuki's Avatar
 
Trade: Customer Education & Development
Join Date: Feb 2005
Location: Aiken SC
Posts: 1,600
Rewards Points: 1,002

Re: Parging Block


Quote:
Originally Posted by Tscarborough
When you say parging, do you mean to leave it as a decorative finish? I assume you do.
Yep...thats what I have always called. I might be the only one though...but surely i've heard it from somewhere.

Quote:
Originally Posted by Tscarborough
Second, I always use an acrylic additive and (stucco grade) fiber mesh in both coats. To prevent a hairy finish, add the water (and color) to your mix water and stir well to break up clumps. Sometimes you will still get a few hairs, in which case you can burn them off with a heat gun if it is an issue.
How much acrylic additive fiber mesh do you add to the mix? Any brand names that work particularily well and were do you find these products?

We don't really have a masonry/stucco supply warehouse anywhere around here.

Thanks for the reply.
Tim
lukachuki is offline  
Old 07-13-2006, 09:49 AM   #4
Pro
 
Tscarborough's Avatar
 
Trade: Monkey Scratching Cat Herder
Join Date: Feb 2006
Location: Austin
Posts: 5,908
Rewards Points: 2,358

Re: Parging Block


For the fiber, I add a handful per bag of masonry; it isn't critical. For the bonding additive, you have to read the bottle. Every manufacturer uses a different concentration of latex/acrylic in their mix. It is critical to get that close, as big differences can cause color and sheen differences.

I call "parging" the act of coating masonry using the same mortar you are laying it with, and usually coating it as you go for purposes of sealing it against water or smoke.

Decorative parging is usually done at a later stage with a different mix and is called "stucco" on the exterior (using cement or lime products), "plaster" (using gypsum products) on the interior or "render" in the UK (using either).
Tscarborough is offline  
Old 07-13-2006, 04:52 PM   #5
Pro
 
stacker's Avatar
 
Trade: masonry
Join Date: Jan 2006
Location: alva,oklahoma
Posts: 1,212
Rewards Points: 520

Re: Parging Block


what is the best additive to use tscar?i am still having problems with my brown coat cracking.i have been using a nice handful of fiber to the mix,(1/2 mas 1/2 port and 5 buckets(25 shovels)sand.i have also added an extra shovel of portland to the mix.i am saturating the wall before i brown coat.my brown coat is only about 1/4"thick.and i am also keeping it wet during the process of appling.(not soaked but just misted)also i am wetting it down at least 2-3x before i leave for the day,and the h/o is wetting it once before he leaves.and the next day i have been wetting it down.
the ho wants to try no fiber and another portland tommorow,and we are looking for additive.thanks
__________________
life is short,do your masonry naked!!
http://ok.local.yahoo.biz/knabemasonry/index.html
stacker is offline  
Old 07-13-2006, 07:24 PM   #6
Pro
 
Tscarborough's Avatar
 
Trade: Monkey Scratching Cat Herder
Join Date: Feb 2006
Location: Austin
Posts: 5,908
Rewards Points: 2,358

Re: Parging Block


Probably too wet a mix. It is usually 100 degrees with direct sun on anything I do before it sets enough to scratch it, and I have very little to no cracking, ever (with no misting, though once it sets, I may hit it with a hose). Typically for small jobs, I use prebagged type S mortar, and for bigger ones use Type S mortar cement. The mix for scratchcoat is not nearly as wet as for laying rock or even a hard brick.

For bonding agent I use whatever is available, sometimes from my store, sometimes from the depot, and for fiber I always use Fibermesh green bag.

Going by your formula, I would cut it back to either straight masonry, or 1 masonry, 1/2 portland, max. That is what most stucco'ers around here use, but they are doing 3/8, 1/4, skim, using a very dry mix and no misting at all. Strength is not an issue. What counts is shrinkage, flexibility, and water-tightness.
Tscarborough is offline  
Old 11-21-2006, 09:27 AM   #7
ALL VINYL
 
all vinyl's Avatar
 
Trade: VINYL SIDING CARPENTRY
Join Date: Apr 2004
Location: HAZLET NJ
Posts: 220
Rewards Points: 150

Re: Parging Block


all vinyl
Member
Trade:


Join Date: Apr 2004
Posts: 63 plaster coat screw up

--------------------------------------------------------------------------------

new foundation plastered then a whole was made for garage door now what is the best addative for adhetion for the plaster coat to plaster coat .the foundation is only 3 months old . they way I was taught on old foundation was wirer ,scratch coat and finish coat . I was looking for an addative to go right over thanks in advance .
all vinyl is offline  
Old 11-21-2006, 06:48 PM   #8
Pro
 
CJKarl's Avatar
 
Trade: Masonry
Join Date: Nov 2006
Location: Ivoryton CT
Posts: 3,654
Rewards Points: 2,590

Re: Parging Block


silpro.com I use SILPRO products all the time. I've had good luck with them. Check out the site and scroll to toward the bottom. I'm using California Stucco on a job right now. Also, tech questions with them are just a phone call away.
__________________
There's Always A Market For Quality
http://www.kaufmannmasonry.com/
CJKarl is offline  
Old 11-21-2006, 07:07 PM   #9
Guest
Guest
 
OsNap's Avatar
 
Posts: n/a

Re: Parging Block


If I am not mistaken Duracoat brushed on will help it stick better to the block.

And I just redid some stucco and use Sakrete Mortar/stuccko mix and it worked really good.
 
Old 11-21-2006, 07:23 PM   #10
ALL VINYL
 
all vinyl's Avatar
 
Trade: VINYL SIDING CARPENTRY
Join Date: Apr 2004
Location: HAZLET NJ
Posts: 220
Rewards Points: 150

Re: Parging Block


Quote:
Originally Posted by CJKarl View Post
silpro.com I use SILPRO products all the time. I've had good luck with them. Check out the site and scroll to toward the bottom. I'm using California Stucco on a job right now. Also, tech questions with them are just a phone call away.
PERFECT THATS WHAT I WAS LOOKING FOR

all vinyl is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Parging Painted Cinder Block Interior tmiller319 Masonry 8 03-09-2009 06:48 PM
Cinder Block walls, block filler and a leak...question SeanATL Painting & Finish Work 9 03-09-2009 03:33 PM
Block Walls DaHammer Masonry 29 03-06-2009 06:11 PM
Does fireplace opening in block wall opening need support? Square-One Masonry 6 11-22-2008 01:31 AM
Does fireplace opening in block wall opening need support? Square-One Construction 1 02-28-2006 12:59 AM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?