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Old 02-13-2008, 09:59 AM   #1
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Ceiling fun --- New sheetrock meets old plaster!


First off - hello there, I'm newly registered here but have often read the posts and answers here on this site. Everyone seems quite knowledgeable and helpful!

I've got an old plaster ceiling in my living room. We recently replaced some of the ceiling near the entrance with sheetrock. Now the problem is that, no matter how much spackle and sanding we do, where the plaster meets the rock a crack appears!!! There is no substantial difference in the weight on the ceiling.

Is there anything you could suggest for this rock-meets-plaster joint?

Thanks a ton!!!

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Old 02-13-2008, 10:59 AM   #2
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Ceiling fun --- New sheetrock meets old plaster!


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....Is there anything you could suggest for this rock-meets-plaster joint?...

Where does the plaster meet the sheetrock? Do you have pictures?

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Old 02-13-2008, 11:04 AM   #3
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Where does the plaster meet the sheetrock? Do you have pictures?
Let me grab a picture for you tonight - thanks!

Basically, I took out a 4x4 piece of plaster from one corner of the living room and replaced it with sheetrock. It all lines up, but it keeps cracking at the joint (presumably since there is some weight on the ceiling).

Thanks again.
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Old 02-13-2008, 11:06 AM   #4
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Ceiling fun --- New sheetrock meets old plaster!


1) What did you attach the sheetrock patch to?
2.) How did you attach the sheetrock Patch?
3.) What did you coat the seam with?
4.) How did you coat the seam?
5.) Did you apply enough coats to the area?
6.) Why did you replace the area?
7.) What is above the area?
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Old 02-13-2008, 12:47 PM   #5
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Ceiling fun --- New sheetrock meets old plaster!


Do you tape the seam? If not it will keep cracking.
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Old 02-13-2008, 04:12 PM   #6
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Ceiling fun --- New sheetrock meets old plaster!


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Originally Posted by AtlanticWBConst. View Post
1) What did you attach the sheetrock patch to?
2.) How did you attach the sheetrock Patch?
3.) What did you coat the seam with?
4.) How did you coat the seam?
5.) Did you apply enough coats to the area?
6.) Why did you replace the area?
7.) What is above the area?
The ceiling area needed to come down in that area since a piece of wall we removed needed fresh ceiling in the removed part.

The sheetrock was attached to the floor studs from the upstairs.

The seam was taped and spackled (a lot).

There is no walking space above the area (closet), but the upstairs contains two bedrooms.

I've heard that sheetrock-to-plaster is often a problem...even more so when there is some element of house weight pushing down on the area (no load-bearing issues though).

I'm wondering if there is some sort of solid tape and or gluey substance that could applied to the area, sanded, then painted over to mitigate the cracking.

Picture to come tonight.

Thanks again.
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Old 02-13-2008, 04:32 PM   #7
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Ceiling fun --- New sheetrock meets old plaster!


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The seam was taped and spackled (a lot).
But, what did you use to tape it with. My guess, at this point is "mesh tape". My other guess is that you used ready mix compound out of a bucket.

Did you attach enough screws at the seams?

If I am correct about the mesh tape, then that is your problem. Always use paper tape when using ready mix compound. (Mesh for "hot Mud"/ Easy Sand Quickdry.

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I've heard that sheetrock-to-plaster is often a problem...
No, that is never a problem.

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I'm wondering if there is some sort of solid tape and or gluey substance that could applied to the area, sanded, then painted over to mitigate the cracking.
Get back to me first about the mesh vs. paper tape...
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Old 02-13-2008, 04:37 PM   #8
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Ceiling fun --- New sheetrock meets old plaster!


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Originally Posted by AtlanticWBConst. View Post
But, what did you use to tape it with. My guess, at this point is "mesh tape". My other guess is that you used ready mix compound out of a bucket.

Did you attach enough screws at the seams?

If I am correct about the mesh tape, then that is your problem. Always use paper tape when using ready mix compound. (Mesh for "hot Mud"/ Easy Sand Quickdry.



No, that is never a problem.



Get back to me first about the mesh vs. paper tape...
Both tape was used. The spackle was the stuff that comes in those big white buckets (I think it was the blue-lid, quick dry stuff).
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Old 02-13-2008, 04:54 PM   #9
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Ceiling fun --- New sheetrock meets old plaster!


You should use only paper tape with ready mix compound.

1.) Remove tape. scrape down compound....or if need be, remove the patch and start over.

2.) Did you add enough framing to attach the patch to? If not add some. If possible, add a continuous line of wood nailing surface along all seams.

3.) Make sure that all 4 seams are properly screwed off. Make sure that the paper is not broken by the screw heads.
(If you don't attach enough screws at seams, then this can contribute to cracks)

3.) Make sure that you apply the paper tape properly, with enough compound under it, over the seams.

4.) Coat the areas again per standard procedure (over the paper tape).

Lastly, You could also use Hot mud or easy sand to do your first coating, as it hardens stronger than ready mix. Finish coat it with ready mix...

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