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-   -   reoccuring drywall crack by window (http://www.diychatroom.com/f101/reoccuring-drywall-crack-window-76850/)

mmhendrie 07-22-2010 06:45 PM

reoccuring drywall crack by window
 
I have a window in my living room that has a reoccurring crack that runs from the bottom corner of the frame and runs out almost two feet diagonally down away from the window. The crack is very thin, 1mm or less.

I've twice now chiseled the crack out wider in a dovetail and put in fresh joint compound, sanded, primed, painted, but each time 10-12 months later, it reappears.

I read that perhaps I should be taping it also?

I have both paper and the fiberglass tape - which is best for this application? Given how thin the line is, should I cut a strip off the preferred tape, or use the entire width? Any other tips/tricks/advice for stopping this thing reappearing?!

thanks!
Matt

Proby 07-22-2010 06:53 PM

Premixed joint compound in a crack is prone to cracking again. A powder compound that needs to be mixed will do a better job. Sheetrock brand Easy Sand works well, and it's sandable unlike other brands. I use it a lot when fixing holes that I had to make to fish wires, it dries nice and hard with less chance of cracking, much stronger than the premixed joint compound.

Tape would be better, but it's more work and requires more finesse to get it right.

racebum 07-22-2010 08:09 PM

setting compound is stronger that all purpose, silverset 90 is a great setting compound that is carried at your local lowes. tape wise, paper wiggles less. if it's a crack prone area setting compound and paper tape will fix you right up.

Sir MixAlot 07-22-2010 09:29 PM

Matt, You might also want to try and put a couple of screws in that area to hrlp stop any movement. Sounds like there should be some framing in that area.

Red Squirrel 07-22-2010 09:31 PM

I've seen similar cracks in my house. They reappeared almost a month after fixed. I believe hey are simply weak spots in the structure where it shifts the most. Probably hard, if impossible to fully get rid of.

racebum 07-23-2010 03:33 AM

Quote:

Originally Posted by Red Squirrel (Post 473810)
I've seen similar cracks in my house. They reappeared almost a month after fixed. I believe hey are simply weak spots in the structure where it shifts the most. Probably hard, if impossible to fully get rid of.

depends. i have a friend i'm helping with his home next week. 6 stress cracks are present from studs drying and the frame settling. i've done these a few times before and successfully disappeared them permanently by cutting a good 1/8"- 1/4" gap where the stress crack is, using setting compound, paper tape and doing the finish. the worst part is how far you generally have to take what becomes a butt joint out. it's often nearly 2 feet of mud feathering if you want a perfect finish

Proby 07-23-2010 05:38 AM

That's exactly why I give it a shot with just setting compound first.

bjbatlanta 07-26-2010 02:47 PM

You should definitely use tape. Mesh is easier to cover and make a flatter repair because there's no mud under it like paper (and it's probably thinner than paper). I only use it for small repairs like this. As stated above, use a setting compound for at least the first coat. If you opt to repair without tape, you're better off using caulk as it will "move" somewhat when the wall moves. Not a very good fix though....


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