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-   -   Plastering on newly laid brickwork? (http://www.diychatroom.com/f19/plastering-newly-laid-brickwork-1045/)

djj66 09-19-2005 02:01 AM

Plastering on newly laid brickwork?
 
Hi everyone!
Hope I can get a bit of advice...

Two years I had some builders in my house, who built a few new brick walls, then plastered and painted them. In the months since then, all of the new walls that they build now have cracks in the plaster, along the lines of the bricks. (the existing walls that they also re-plastered/painted don't have these cracks)

It's clear to me that the builders didn't do their work properly, but I'm not sure of how to prevent this happening again. So I hope someome can help with these questions...

1. After building a new brick wall, is it necessary to wait a few days, before starting plastering? (and if so, how may days?)

2. Whats't the correct procedure for building then plastering/painting new walls to avoid cracks in the paint/plaster like this.

Thanks for all your help and advice!
David:confused: :o :confused:

747 09-19-2005 03:08 AM

That is the most stupid thing i have ever heard in my life. Plaster has to be applied to blue board. Why? The blue is a special paper that it adheres to. Thats why you can't apply it to regular drywall. I don't know what else to say besides maybe teetor has a ideal. I honestly have never heard of doing that before.

K2eoj 09-19-2005 09:51 AM

I've plastered block walls a coulple of hundred times and it is probably the industry standard for block foundations. The right plaster mix should bond with brick as well. My question would be why did they build a brick wall and then plaster it, and what is the brick wall sitting on. Also I'd like to know what mix they used but you probably don't know that. if they used something designed for drywall that would be a problem. HS

Humble Abode 09-19-2005 09:55 AM

Did you get a written warranty? I would call them back in.

It sounds like the grout is still drying under the plaster. I don't know what the dry time is for the material they used but they may have plastered to soon.

K2eoj 09-19-2005 10:28 AM

Humble is right. When plastering block we would first coat right a way and then wait 3 or 4 days to second coat. HS.

Teetorbilt 09-19-2005 10:51 AM

Sorry 747, plaster over block and brick was done before anyone ever heard of 'blueboard'.
It sounds to me like they didn't know what they were doing. Where they went wrong is a matter of conjecture. The plaster may not of been the correct type, mixed too loosely or didn't have a binder added.

djj66 09-19-2005 09:17 PM

Plastering on newly laid brickwork
 
Well thanks for all these replies...

You're right I don't know what mix they used, however I'm pretty sure that the problem was they simply didn't wait long enough after finishing the bricklaying...time is money :-(

(the walls built were internal walls laid on concrete, not stress bearing walls).

So the correct procedure is to wait about 3 days after finishing the bricklaying - before doing any plastering?

And does it help to water the brick work to stop the cement drying too quickly?

Thanks again for any thoughts on this!
DJJ

747 09-20-2005 12:53 AM

Teetor I learned something new today. Glad to see your still ok down in the sunshine state. Think there might be trouble brewing in the keys again.

K2eoj 09-20-2005 10:05 AM

Quote:

Quote:

Originally Posted by djj66
Well thanks for all these replies...

You're right I don't know what mix they used, however I'm pretty sure that the problem was they simply didn't wait long enough after finishing the bricklaying...time is money :-(

(the walls built were internal walls laid on concrete, not stress bearing walls).

So the correct procedure is to wait about 3 days after finishing the bricklaying - before doing any plastering?

And does it help to water the brick work to stop the cement drying too quickly?

Thanks again for any thoughts on this!
DJJ



Got any pictures??

djj66 09-20-2005 09:21 PM

Quote:

Originally Posted by hammerslammer
Got any pictures??

I can get some!
It looks like I can insert them into a post with the "Insert image"
I'll try and do that tomorrow.

Teetorbilt 09-21-2005 12:01 AM

747, had lunch with my buddy in Marathon today, looks like everything's OK.

dj, today there are 2 types of binders used. One is painted on the surface to promote adhesion, the other is mixed into the plaster to prevent cracking. Horsehair was used for centuries in the second case, I still run into thatfrom time to time. When horses began to get scarce (the industrial age), asbestos was used. Since then various fibers have been used, I have used stranded fiberglass for years as a primary coat with excellent results. You don't want to try and sand it, skim coat and then sand if required. A guy that is skilled at skimcoating shouldn't need any followup.


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