Stucco matching

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TheNiceGuy
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Stucco matching

Postby TheNiceGuy » Wed Apr 19, 2017 9:28 am

Hello All
Pretty basic stucco pattern to match, however no sponge floats available. Any ideas what I can do?
Here's a video showing the project and issues involved:
https://www.youtube.com/watch?v=IKkiy82 ... e=youtu.be
Thank you


Clarence
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Re: Stucco matching

Postby Clarence » Wed Apr 19, 2017 2:12 pm

You have some options you can try.
1 take a wood float and spray adhesive to attach a piece of bath towel or wash cloth to the face of the wooden trowel use it the same as a sponge float.
2 Buy sheet foam use spray adhesive to attach it to a steel or wooden trowel.
3 Buy as many kitchen sponges as needed to cover the face of a trowel use spray adhesive to attach.
Keep in mind that the texture of the sponge , Foam or cloth material will affect the stucco texture.

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Shannon
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Re: Stucco matching

Postby Shannon » Wed Apr 19, 2017 7:00 pm

This is out of my area of expertise so I would go with what Clarence has suggested, sounds like any of those would work?
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Mastercarpentry
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Re: Stucco matching

Postby Mastercarpentry » Thu Apr 20, 2017 3:00 am

Clarence is my go-to guy for stucco, plaster, and old masonry questions. He's like an encyclopedia with thus stuff :D

Phil

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Shannon
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Re: Stucco matching

Postby Shannon » Thu Apr 20, 2017 8:13 am

BTW, welcome Clarence! Are you one of Mastercarpentrys buddies from TOH?
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Clarence
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Re: Stucco matching

Postby Clarence » Thu Apr 20, 2017 9:32 am

Yes I was a member of TOH forum.
I am a retired plaster and stucco guy also did a lot of work on Historical buildings to include some of the top 5 historical Buildings in the U.S.
And at least 65 building that are on the National Register.

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Shannon
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Re: Stucco matching

Postby Shannon » Thu Apr 20, 2017 12:47 pm

Clarence wrote:Yes I was a member of TOH forum.
I am a retired plaster and stucco guy also did a lot of work on Historical buildings to include some of the top 5 historical Buildings in the U.S.
And at least 65 building that are on the National Register.



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TheNiceGuy
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Re: Stucco matching

Postby TheNiceGuy » Sat Apr 22, 2017 10:45 am

Ok, I shopped around and bought every conceivable spongy thing that might work. I finished part of the project last night, and I show the result and some my questions in this video. I was going to finish the rest of the house tomorrow. It would be nice to know if I'm doing it properly.
Thanks
https://www.youtube.com/watch?v=E2dTQw42t-g
Forgot to show the scratch coat that I'm typically working with so here it is:
https://www.youtube.com/watch?v=vZzVZ3QbWI4

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Shannon
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Re: Stucco matching

Postby Shannon » Sat Apr 22, 2017 11:12 am

I'm going to leave this in Clarence's hands , he has the expertise you need.
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Clarence
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Re: Stucco matching

Postby Clarence » Sat Apr 22, 2017 11:26 am

To start with what is the sand/ Cement mix it should be 3 parts sand & 1 part cement also adding lime would help.
A good stucco mix would be 3 sand ,3/4 cement & 1/4 Lime.
From what I see in the pictures you are trying to texture the product when it is to wet.
I also see a white streak in the finish which indicates to much water.
The finish should be textured when t is dry to the point that you cannot leave a finger print in the surface.
The sand for a good sand finish should pass through a screen wire mesh like a window screen.
That GREEN Sponge shaped item in the photo should leave a very nice sand finish.

TheNiceGuy
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Re: Stucco matching

Postby TheNiceGuy » Sun Apr 23, 2017 2:46 am

Ok thanks guys. Clarence, I use about a 3:1 Portland mix as you recommend.
I've tried to find lime before, and could not. I'm gonna have to get a translator to help me again.
I imagine I'll have to wait until the next day to do the texturing then? I think part of my confusion came from watching videos were he's using rapid set mix, so he's doing it all at once.
Texturing will not alter the level of the stucco? How can I get rid of that bump then that happens where it meets the old stucco? Is that no problem if I'm using a finer grained sand?
I just did your screen test, and the standard sand I use, most of it doesn't go through. The finer sand I just bought goes through no problem. Is that standard sand not a suitable for stucco in general then? Is that finer silica sand easier?
The water streaks were from using a mister to moisten it up making it more workable after it was on the wall.
Edit: Do you think the elastomeric paint will be able to cover up all these textures anyway?

Clarence
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Re: Stucco matching

Postby Clarence » Sun Apr 23, 2017 9:06 am

Texturing will alter the finish level.
To get rid of the bump apply the stucco finish coat proud of the existing stucco.
Than float the newly applied stucco to the same plane as existing.
The Silica sand should be ok to use.
As for misting to make workable only washes away the sand / Cement not a good idea to add water after the stucco is applied.
When you float the stucco you should get a damp fall off of sand / cement.
I also think your finish coat is not thick enough after floating it should be no less than 1/8 inch.
You may want to switch to a Synthetic stucco finish and refinish the entire wall surface with color of choice no painting required.
I don't recommend the use of Elastomeric coatings over stucco.

TheNiceGuy
Posts: 167
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Re: Stucco matching

Postby TheNiceGuy » Sun Apr 23, 2017 10:12 am

Thanks Clarence. Since I am working at night right now when it's cold, I probably have to wait till the following morning at least before the stucco is suitable to float. I imagine I can rough the surface up a bit to let it breathe and cure faster. When it's stiffened up a bit, I can try floating with the sponges, and everything should blend nicely? Even doing this, will that standard larger aggregate I've been using ruin the transition area?
If I understand you correctly, the sponge float levels the stucco just by grinding it off, you don't actually move it to another area like you do with the steel trowel?

I'll have to check out that synthetic stuff you mentioned. We just want a simple white finish. Almost all the neighbors who had renovations done used a textured elastomeric paint over the old stucco, my wife really likes its look, so she was requesting that.
These old houses tend to shift around a bit, especially since we're in an earthquake zone, and they all seem to have cracks. I'm not sure if that's why they're going with a flexible elastomeric finish.

Clarence
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Re: Stucco matching

Postby Clarence » Sun Apr 23, 2017 12:52 pm

Putting stucco on at night you will not sponge float it the next morning Your cement should take up in 4 / 5 Hrs and be ready to float.
Depending on temps it must be 4 degrees and rising to apply stucco at 40 degrees it will take a good 5 Hrs. If temps are going below 40 you have a problem.
When you state that cement is being used what type ?
Portland Type I , Type II or Type III they all have a set time.
Is your cement an NHL type ?
Aggregate size will affect transition to existing.
The floating process removes aggregate & cement and leaves a texture as related to the floats surface.
I have a question if all the neighbor's have stucco exteriors why not ask the translator to find out what the standard practice is and what material and tools were used & are available in your area to the area?
As for the Elastomeric coating in my area the high moisture & humidity causes the coating to blister.

TheNiceGuy
Posts: 167
Joined: Sun Oct 11, 2015 12:38 pm

Re: Stucco matching

Postby TheNiceGuy » Mon Apr 24, 2017 9:02 am

Clearance, I have no idea what type of Portland it is. It's a gray powder and comes in a 25 kg brown paper bag. All of the store staff and managers are useless for information, I've tried on other topics.
Neighbors just the reform out of a catalog from a sales person, they have no idea how it's done. It's quite difficult for me to find a skilled, or even unskilled, contractor to get information from. I tried to get my wife, who is the translator, to call or go with me into a shop to ask questions, but she refused feeling it's bad manners.
Whenever I pay to have work done ( my wife is willing to translate then) , I often have a list of questions I ask hoping the guy knows something. Sometimes they do, sometimes they don't, and sometimes they give me bad advice.


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