Stains in the ceiling from dry cement ? Have you heard of this? How do I fix it?

Question

I have cement stains in the ceiling surrounding my chimney. The house was built 3 years ago and the first stain appeared about 6 months ago. A small stain appeared and when I went up and looked in the attic I could only find a small amount of dry cement used to build the chimney that had dropped onto the plasterboard right where the stain is, obviously during the build process. As the house was built three years ago this is no longer wet cement and the stains have suddenly appeared. Now I have a bigger stain and the cement is dry again and right above the stain in the ceiling .....Can cement still stain even when hardened and dry in the attic for a number of years? Will it work just to paint over the stain or will it come back? There is definitely no water coming in as nothing is wet and there is nothing in the attic above the stains that would drip onto the attic floor, there is also no sign of a leak surrounding the chimney through the roof. All help appreciated ;0)

Answer 1

The fireplace and chimney are usually built long before the drywall is installed, so it is odd that you would find any loose cement on top of the drywall. The cement you found must have become dislodged later in time. Furthermore, the drywall is made of gypsum, which is a material not that different than cement. I would not expect dry cement to make a stain through a ½" of drywall.

What you describe seems very much like a water stain. I suggest that you examine the metal flashing on the roof around the chimney to see if it has pulled away from the bricks. Then run a water hose on the roof and get in the attic to look very carefully for signs of a leak. Although you believe that there is no water coming in, that is all that could cause the stain.

I suppose there is one other possibility. Could an animal have gotten into the attic and urinated in that spot?

Answer 2

If the wet mortar stained the dry wall when it originally fell on it, then that stain spot could migrate with time through the dry wall board to your side. Also, some moisture in the air can help speed the stain migration. If you can get to the dry mortar, I would go ahead and get it off the board. The fix is going to be to seal your ceiling with a stain blocking primer, then repaint the ceiling. By the way, you should overlap the stain area by several feet with the primer just to make sure it doesn't bleed through outside the primer's coverage area, or prime the entire ceiling.

Answer 3

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