Replies

1. 
   migraine | Apr 23, 2009 02:50am | #1

   measure the diagonals of the board are they the same?

   I'd be betting that the ceiling/walls are not plumb/square.

   but, what do i know, I'm not there.

1. 
   migraine | Apr 23, 2009 06:35pm | #16

   Wow, In all the years of dealing wiith drywall, I have never noticed or ever measured for squareness. 

   I'm not saying that I use this stuff on a daily basis, but then again it's always subbed out, unless it's few sheets here or there.  Nor, has anyone ever mentioned it.

   Learned something new late in the game.

1. 
   KenHill3 | Apr 23, 2009 06:58pm | #17

   Yup. I have run into a sheet here and there that was out a half an inch. WTF?Out of square sheets have come from HD. Any truth to the rumor that Home Depot sells second run DW?

1. 
   Piffin | Apr 23, 2009 07:31pm | #18

   I heard it so it must be true;)I'd second the notion that he should double check square by diagonals. I thought I'd run into that once, but it turned out the the SR square I was using had gone off by 3/8".My first thought on this was, "Oh Well, there are only about four butt joints in a second story of a cape where this would matter anyways." 

    

   Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!

2. 
   maverick | Apr 23, 2009 03:15am | #2

   thats not acceptable. I would load it up and take it all back where you got it from

3. 
   Pelipeth | Apr 23, 2009 03:18am | #3

   Does it have big letters on the back that spell C H I N A ?????????

4. 
   DanH | Apr 23, 2009 03:20am | #4

   Well, I always figured 1/2" is "sheet rock accuracy", but it sounds like they maybe had the slicer misaligned as the rock was rolling off the mill. Kinda hard to believe, since there'd be little reason for the alignment to be mucked with, but maybe something like someone replacing the knives and not getting things locked back together right.

   The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. -John Kenneth Galbraith
1. 
   BillHartmann | Apr 24, 2009 07:32pm | #20

   DW and many other sheet goods are either made on a continuous line or very long sheets and then cut to length.Usually they are cut as the sheet goods move at a constant speed. And a knife or saw is used that travels across the sheet at an angle. That angle and the speed at which it moves across the sheet has to be matched to the feed rate of the sheet.So I can see where it would be easy to get those miss matched. Although good control systems can adjust and monitor that..
   William the Geezer, the sequel to Billy the Kid - Shoe

1. 
   pgproject | Apr 25, 2009 06:57am | #21

   Hey- everyone always says "measure the diagonals", but aren't there situations where the diagonals would be the same, yet the piece still out of square? The diagonals will only be the same if the angles are 90, AND BOTH SETS OF OPPOSITE SIDES ARE EQUAL LENGTH, right? I mean a trapezoid will have the same diagonal measurements.Bill

1. 
   KFC | Apr 25, 2009 07:17am | #22

   You are correct.

   I suggested a 3-4-5.

   k

2. 
   Dinosaur | Apr 25, 2009 07:18am | #23

   For a four-sided figure, the sum of one pair of opposite angles must be equal to the sum of the two other opposite angles...which is to say the sum of any two opposite angles must be equal to 180º.

   This is true of squares, rectangles, and isoceles trapezoids; it is not necessarily true of parallelograms (of which squares and rectangles are two special cases).

   Dinosaur

   How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....

3. 
   Piffin | Apr 25, 2009 01:00pm | #24

   Yes, that is right, but just assume that is know part of using diagonals to check square. sometimes you gotta take 'm back to sixth grade, and sometimes all the way to kindergarten. 

    

   Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!

5. 
   Malo | Apr 23, 2009 03:21am | #5

   Flip it over, the back is squarer.

6. 
   JeffBuck | Apr 23, 2009 03:51am | #6

   I've had it happen with both drywall and plywood over the years.

    

   never more than a couple in a big load ... but plenty annoying ... especially when U think yer going nuts.

   Jeff

       Buck Construction

    Artistry In Carpentry

        Pittsburgh Pa

1. 
   DanH | Apr 23, 2009 03:59am | #8

   I've had it happen with plywood. Only off by maybe 1/4", though.
   The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. -John Kenneth Galbraith

1. 
   JeffBuck | Apr 23, 2009 04:05am | #9

   1/4 is had been the norm ... and luckily it still wasn't a normal occurance ...

   but do remember returning the load of ply that was out an honest 1/2"

    

   Jeff    Buck Construction

    Artistry In Carpentry

        Pittsburgh Pa

7. 
   KFC | Apr 23, 2009 03:52am | #7

   I could have used some of that on the last remodel...

   Sorry.  Seriously, that's bizarre.  I'd raise he!!. 

   Not to question your powers of observation, but how did you determine the 1/2" out of square?  Big drywall square?  Framing square?  3-4-5?

   k

8. 
   andybuildz | Apr 23, 2009 07:39am | #10

   I had that happen years ago when of all things I was rocking a huge ceiling on a second floor with 8's and 10's. Went through two rows driving myself crazy trying to align the rows before I figured out The 10' boards were a light 47 3/4" wide.

    

    

    

   http://www.cliffordrenovations.com

   http://www.ramdass.org

    

9. 
   Ted W. | Apr 23, 2009 08:04am | #11

   Welcome to BT, Nemesis12. Fill in your profile an stay a while. =)

   I had a batch 1/4" out of square, about 100 sheets. I just kept the factory cut ends together and it was no problem. Not sure that would have worked as well with 1/2" out of square, would end up barely lipping the edge of the studs/joists.

   What brand is it?

   ~ Ted W ~

   Cheap Tools! - MyToolbox.net
   Meet me at House & Builder!

   ---

   Edited 4/23/2009 1:05 am by Ted W.

   
   

   ---

   Edited 4/23/2009 1:06 am by Ted W.

1. 
   ruffmike | Apr 23, 2009 08:11am | #12

   I've spent too much of my life hanging rock. This happens from time to time.

   Usually you can take the two sheets in the bundle and flip one around and the butts will line up perfectly. Matching angles!                            Mike

       Small wheel turn by the fire and rod, big wheel turn by the grace of god.

2. 
   DanH | Apr 23, 2009 01:45pm | #14

   One thing to keep in mind is that likely the back-to-back sheets have the opposite cut. So you'd want to use sheets from the "front" side of a pair on one run and from the "back" on the next.
   The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. -John Kenneth Galbraith

1. 
   Ted W. | Apr 23, 2009 04:45pm | #15

   One thing to keep in mind is that likely the back-to-back...

   Now that's interesting, I never thought about it till you mentioned it. We were carrying the sheets in 1 at a time because it all had to come up an enclosed porch with narrow stairs. Me and one guy carrying them to the 2nd floor living room and 2 other guys carrying them to the 3rd floor dining room - both about the same distance. Consequently, every first sheet went to one stack and every second sheet went to the other stack. Had you not mentioned the back-to-back issue it would never have dawned on me that it made a difference. ~ Ted W ~

   Cheap Tools! - MyToolbox.netMeet me at House & Builder!

10. 
    Lawrence | Apr 23, 2009 08:28am | #13

    That's just no fun.

    I agreed to do some ceilings in a cottage about 15 years ago... didn't realize there was a couple of families of raccoons in the attic for a few years... that's another story.

    Anyhow, this was in the last bad recession and we took on the work to keep busy.

    An Unnamed drywall company supplied the drywall and it was nearly a buck cheaper per sheet.

    I have to say that what happened was pretty rediculous. I taped it... and it all looked good, till the client walked in the next day and noticed some circular spots projecting downwards.

    I contacted the manufacturer to ask for advice... they sent a rep out. The rep said to cut them out and hit them with some durabond.. and finish it again.

    This went on for about 7 coats... every time I hit it with mud... more spots came down.

    Only really on the ceiling did it happen, but it was very frustrating. (I only realized what I learned in renovations when I finished a flawless drywall ceiling the other week in my dining room with end joints)

    Anyhow, drywall is sprayed on the paper with nozzles. When they mess up the mix the mix sticks to the nozzle, overheats and the blobs of burnt plaster drips onto the sheets... in a pattern of plaster that won't bond to the paper... too dry.

    Add moisture... the paper droops.

    Needless to say this is waaay more than I wanted to know about drywall, but the thing it taught me was stick to CGC.

    Compound...drywall, never had an issue.  It's worth the buck or so extra.

    Yes, I went after the drywall manufacturer and they came good for the cost of stripping all their drywall out and putting cgc in.

    That's why I am not mentioning their name.

    Stay away from cheap junk... it is cheap for a reason.

    L

    GardenStructure.com~Build for the Art of it! Decks Blog

11. 
    natem | Apr 24, 2009 06:58pm | #19

    Strange. I just did a firewall in a commercial property, and had 20+ sheets of 5/8". I also bought a new T-square from Mayes, which I have always used. I thought I was losing my mind and the square...wasn't. It was the drywall. 1/4" on each end. I checked the square on some veneer ply in the shop, and and it read true.

    BTW, drywall came from a supplier I've used for years. Not big box stuff. I guess it happens, I just don't anticipate it.