Hairline cracks

 
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Old 11-07-2010, 10:57 AM   #1
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Hairline cracks


Just completed a drywall ceiling in a basement (25 -4x10 sheets) for a customer. I just recieved a call that some of the joints have hairline cracks in them. The entire ceiling was screwed and glued (liquid nails). I kept the electric heat set around 68-70 durring the job. I did some touch ups and 1 coat of primer. I dont finish drywall everyday but have alot of experience. I have a feeling the home owner shut off the heat after I left the job. Our area has been down in the low 30's the past few nights. Does anybody have any advice?

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Old 11-07-2010, 11:07 AM   #2
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Re: Hairline cracks


Well, you might want to go make sure there really are cracks, asap.
I would assume that they shut the heat off as well. Are the cracks just in butt joints? Just in flats? Or both?
Did you pre-fill? How many coats of mud? What kind of mud? Mesh or paper tape?
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Old 11-07-2010, 11:18 AM   #3
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Re: Hairline cracks


The homeowner inspected every seam with a led flashlight before I primed job was perfect. I taped with #45 and perforated paper tape 2 coats. And skimed 1 coated blue lid lightweight. Cracks are in the factory tapered mud valleys.

Last edited by AQC; 11-07-2010 at 11:21 AM.
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Old 11-07-2010, 11:23 AM   #4
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Re: Hairline cracks


How much of a temp change do you think it would take to cause a crack?
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Old 11-07-2010, 12:24 PM   #5
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Re: Hairline cracks


I suspect you never used taping compound when you taped.

Using #45 durabond, sheetrock or any other hot mud is to hard and there's not enough glue for taping as far as I'm concerned and more then likey thats your problem.
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Old 11-07-2010, 01:34 PM   #6
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Re: Hairline cracks


I,ve found that when using 5/8 [if you did] the tapers seem to be deeper than 1/2 . Even 45 will slightly shrink thus your problem---did you do all coats in one day? Basements are tough.[drying times] I prefer 20 durabond [brown]in this situation and ezsand20[white]and as much as it sucks/I hate applying last coat same day [bubbles] but I usually do.
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Old 11-07-2010, 09:55 PM   #7
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Re: Hairline cracks


if you did what mudstar stated ,taped with a hot mud,then most likely that.temperature maybe,if i remember my F temp,30 is 0 c,cold yes,but did the room temp fall to that.combine those 2 and there's trouble though.
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Old 11-08-2010, 06:07 PM   #8
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Re: Hairline cracks


I did 1 coat a day to let it dry. After I finish sanded it did not get primed until the next day over 24 hrs . I am going tonight to look at it.
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Old 11-08-2010, 09:41 PM   #9
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Re: Hairline cracks


I have seen that about a ten degree swing in temp. (up or down) will cause it to crack like that. Sounds like you did everything right.
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Old 11-12-2010, 11:28 PM   #10
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Re: Hairline cracks


I was asked to inspect a basement a few months ago with the same problem that another drywall company had finished. I came to the conclusion that the floor joist in some areas were moving enough when the family was walking around upstairs to stress the buttjoints and give the hairline cracks.

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