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 05-25-2012, 10:15 PM   #1
Member
 
Join Date: Feb 2009
Location: St. Louis, MO
Posts: 93
Share |
Default

Aggregated Stucco?


I have two gables that are covered with ancient stucco long overdue for replacement. I was thinking of replacing the stucco with siding. However, at my daughter's school, I saw an interesting finish. The dark areas around roof in this picture
Aggregated Stucco?-img_0203-medium-.jpg
and detailed here
Aggregated Stucco?-img_0135-medium-.jpg
Aggregated Stucco?-img_0136-medium-.jpg
got me thinking that it would be a good texture for the gables. It looks like the gravel finish is adhered to cement fiber board.

Is anyone familiar with the technique for applying aggregate to cement board? Is the aggregate attached before the board is put up or after?

mwpiper is offline   Reply With Quote
Old 05-26-2012, 02:42 AM   #2
Member
 
Join Date: Jun 2009
Location: Somerset, England
Posts: 678
Default

Aggregated Stucco?


Looks look pebbledash, which is done by throwing them on while the stucco is still wet, and then pushing them in with a wooden float.

stuart45 is offline   Reply With Quote
The Following User Says Thank You to stuart45 For This Useful Post:
Willie T (05-27-2012)
Old 05-26-2012, 07:56 AM   #3
Member
 
Join Date: Feb 2009
Location: St. Louis, MO
Posts: 93
Default

Aggregated Stucco?


So it's done by putting up the cement fiber board up first, laying on a layer of stucco, throwing the stones at it and then tamping it with a float? Is there any special type of stucco required? Single layer of stucco on the cement board? How large an area is normally done at a time? If a wall can't be completed in a day, is working from a dry edge a problem?

I've read that the stones need to be screened for uniform size. Does any size work as long as it's uniform? Case in point. The hotel we were staying at (Grand Plaza in St. Pete's Beach if you're familiar with it) has three inch stones cemented to the walls (sorry, no picture). Of course, I doubt they threw them into place.
mwpiper is offline   Reply With Quote
Old 05-26-2012, 11:11 AM   #4
Member
 
Join Date: Jun 2009
Location: Somerset, England
Posts: 678
Default

Aggregated Stucco?


Quote:
Originally Posted by mwpiper View Post
So it's done by putting up the cement fiber board up first, laying on a layer of stucco, throwing the stones at it and then tamping it with a float?
Is there any special type of stucco required?
I use a 1/1/5 lime/OPC/sand for the top or butter coat, and 1/1/4 for the scratch coat.
Single layer of stucco on the cement board? How large an area is normally done at a time? If a wall can't be completed in a day, is working from a dry edge a problem?
It's best to the lot in a day, as edges tend to show up, as can often be seen with patch repairs. The size you can do depends on how good you are with the laying on trowel.

I've read that the stones need to be screened for uniform size. Does any size work as long as it's uniform?
Normally use small stones. There is a special trowel known as a Harling trowel used to throw them with. You need to stand back a bit to make sure you get an even spread. Go over the wall a few times to build up the stones.

Case in point. The hotel we were staying at (Grand Plaza in St. Pete's Beach if you're familiar with it) has three inch stones cemented to the walls (sorry, no picture). Of course, I doubt they threw them into place.
I doubt if they threw those on.
stuart45 is offline   Reply With Quote
Old 05-27-2012, 04:54 PM   #5
Member
 
Join Date: Feb 2009
Location: St. Louis, MO
Posts: 93
Default

Aggregated Stucco?


Many thanks stuart. I will try some samples at ground level to see how it works.
mwpiper is offline   Reply With Quote
Old 05-27-2012, 06:09 PM   #6
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Default

Aggregated Stucco?


One method that produces good results, and also helps the aggregate to adhere better is to do the spatter-dash as described above. Then trowel a smooth, solid layer of stucco over the stones, just covering them.

As that second covering of stucco begins to set up (usually within an hour or so), wave a stiff, but fine spray of water across the surface.... removing about two thirds of the stucco in smooth, even passes. This produces a less-harsh, cobble stone appearance, and also locks each stone into place better than just slinging the spatter dash up there and pushing the stones in.
__________________
"True eloquence consists in saying all that is necessary, and only that which is."
FranÁois Duc de La Rochefoucauld
Willie T
Willie T is offline   Reply With Quote
The Following User Says Thank You to Willie T For This Useful Post:
stuart45 (05-28-2012)
Old 05-28-2012, 06:13 AM   #7
Member
 
Join Date: Jun 2009
Location: Somerset, England
Posts: 678
Default

Aggregated Stucco?


Thanks for that info Willie T. I've never seen that done before, but it seems a good method. One of the problems with pebbledash is that the stones tend to fall off over the years.
Another method used here is called Roughcast, where the stones are put into the mix first and then trowelled on as a form of concrete. This produces a very strong and waterproof finish, although not everyone likes it's appearance.
stuart45 is offline   Reply With Quote
Old 05-29-2012, 07:19 PM   #8
Member
 
Join Date: Feb 2009
Location: St. Louis, MO
Posts: 93
Default

Aggregated Stucco?


a site from the UK also called them "wet dash" vs. "dry dash" techniques.

When I first saw the pebble finish in the pictures I was thinking exposed aggregate concrete where the upper layer of cement is washed off a horizontal surface like sidewalks or driveways. My problem with that is the walls I want to put this on are gables (2nd floor level) over brick on the first floor. Dry dash would probably spill a bunch of gravel on the ground. If I did a wet dash, I would probably drape a drop cloth over the first floor wall to prevent staining.

This is what the old stucco looks like:
Name:  Old Stucco.JPG
Views: 251
Size:  51.3 KB
Yeah, when big chucks like this are peeling off, it's in pretty rough shape.
This is the back side:
Name:  Back of Stucco.JPG
Views: 182
Size:  48.1 KB
The stucco was put on grooved wooden planking. No water proofing. Where this chunk came off, the sheathing is shot. I suspect that every place there is a crack there will be water penetration, so the sheathing will probably have to be replaced too.

mwpiper 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
Stucco cracks and stucco questions FrankL Building & Construction 2 05-22-2011 06:23 AM
ledger stones on stucco wall, but wall is bowed rrauenza Building & Construction 7 05-18-2010 05:38 PM
Questions about painting and possibly adding siding to stucco house? krm27 Painting 3 01-19-2010 12:22 PM
Where stucco meets the window & door; caulking Longleaf Building & Construction 12 08-12-2008 04:46 PM




Top of Page | View New Posts

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