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Old 04-22-2011, 11:01 AM   #16
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Superior Walls - Floating Corners & Drywall


It's even easier than that.

In reality you DO NOT want solidly fastened corners...... either at wall corners or at ceiling to wall junctions with trusses. This is what causes the cracking at those joints that you often see.

You DO, however want some backing so one wall board won't bend when the other one is pushed against it in installation. So this is done by simply screwing the appropriate thickness of wood directly to the back of the drywall sheet. Do NOT try to also fasten it to the wall behind it. It's only there to support the board when it is pushed by the installation of the abutting board.... or something or someone leaning against it. Yes, you can go ahead and build all the solid corners you want, and they will serve as good backers.... but please don't fasten to them on both sides. By code, you should be fastening within something like 8 inches or so of the corner. But no closer on one side or the corner cannot flex as it needs to.

About 7" or 8" of 'floating", on one unfastened board at all corners is good. WAY, way better than a row of fasteners down each side that locks that board to that wall. You see, walls flex and move independently of the other walls they meet to form corners. And one wall usually does not move the same distance (or sometimes even in the same direction) as the wall abutting it.

BTW, it is the "underlying" board that does not get fastened on walls, and the ceiling board on celings. Hard to explain, but you can read about it here on Pages 7 and 8: http://www.gypsum.org/pdf/GA-216-2010.html

Giving the boards the freedom to give a little and adjust themselves to these seasonal wall movements helps stop corner cracking.

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Last edited by Willie T; 04-22-2011 at 11:53 AM.
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Old 04-22-2011, 12:05 PM   #17
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I know my previous post sounds crazy. But it is the truth, despite how your conditioned mind thinks it should be.

There are many things in construction that look like they should go one way, but they really need to be installed just the opposite.

Here's an obvious example that can be found in most homes. Bi Fold doors.

On which panels do the handles go?

Most people would say the two panels in the center.... and that is where most installers place them. But this is wrong.

They go on the outside panels... the ones with the pivots at the top and bottom.

Ever notice what a pain most Bi Fold doors are to smoothly open and close? With the knob (handle) on the outside panels, they open and close just as smoothly as regular doors.

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