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Jaforocks 01-27-2011 06:31 PM

Drywall Cracking
Hi, We've refinished the basement of a 50 year old house with new drywall on the walls and ceiling. The walls were panelled and there was a drop ceiling when we started. We tore off all the panelling, drop ceiling and all the strapping and made sure there were no nails on the existing studs and floor joist on the ceiling.

We had a contractor/handyman do the drywall and mudding (they both have done drywall before professionally). We used standard 1\2" drywall and good quality mud etc. We are now getting some cracking at some of the joints (we used flex/mesh tape for the joints) that keeps recurring.

Could the joists be moving and creating the cracks? There is some creaking on the floors which I assumed were loose nails on the existing subfloor (we tore up the old hardwood and are replacing it with another layer of sub-floor which will be screwed down).

Just wondering if you think it is the Joists - in which case, would lifting the old subfloor, putting in 2x6 braces to brace the joists and then screwing down the sub-floor fix the problem? Or, do you feel there is something wrong with the installation?

Any help is appreciated, just want to make sure we fix this before putting down sub-floor and carpet.


Dwoodsmith 01-27-2011 07:04 PM

Most likely caused by the construction going on upstairs. The new floor will stiffen the situation. Don't bother fixing it until the floor's done.

Gary in WA 01-27-2011 09:48 PM

Paper tape on the joints hide any movement better than mesh, it is also stronger. Mesh has to be applied with setting type compound for the initial, first coat, as per manufacturer and wallboard maker. The following coats can be other. I agree, wait until the hardwood's down.


Axecutioner-B 01-27-2011 10:33 PM

I agree too. I have cracks in my garage because i used mesh WITHOUT using hot mud (i used regular joint compound) on my new walls. At the time i didn't know any better.

bjbatlanta 01-28-2011 08:48 AM

Yep, when using mesh, at least the first coat should be setting type compound...

chrisBC 01-29-2011 01:58 AM

by the way next time use 5/8 for ceilings...:thumbsup:

bjbatlanta 01-29-2011 06:58 AM

1/2" is acceptable if the joists are 16"o.c.

Gary in WA 01-31-2011 09:34 PM

Install the 1/2" perpendicular to the framing members, not parallel IF using a water based texture, Table #1;


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