Hairline cracks

 
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Old 11-07-2010, 09:57 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, 10:07 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, 10:18 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 10:21 AM.
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Old 11-07-2010, 10:23 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, 11:24 AM   #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, 12:34 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, 08:55 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, 05:07 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, 08:41 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, 10:28 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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Old 11-13-2010, 08:04 AM   #11
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Re: Hairline cracks


Quote:
Originally Posted by proficient Mudder View Post
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.

Bill

What about all those 2 story houses........ that was a lame answer and you probably had them believe you too.

At least your not cutting up the other trades workmanship like some would.
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Old 11-13-2010, 08:05 AM   #12
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Re: Hairline cracks


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Old 11-13-2010, 08:14 AM   #13
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Re: Hairline cracks


Probably used that (GREAT) mesh tape huh?
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Old 11-13-2010, 08:26 AM   #14
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Re: Hairline cracks


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Probably used that (GREAT) mesh tape huh?
(great white) mesh tape with hotmud #45
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Old 11-13-2010, 04:28 PM   #15
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Re: Hairline cracks


Quote:
Originally Posted by Mudstar View Post
What about all those 2 story houses........ that was a lame answer and you probably had them believe you too.

At least your not cutting up the other trades workmanship like some would.
Yeah, because he said that all basements have movement in the floor joists above. It just isn't possible that the floor joists were improperly installed without any stabilization.

I think it's funny how critical, opinionated, and adamant you guys can be. I can't see how anyone else out here makes a living doing anything that differs from your methods since you're all always right.
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Old 11-13-2010, 05:27 PM   #16
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Re: Hairline cracks


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Originally Posted by SlimPickins View Post
Yeah, because he said that all basements have movement in the floor joists above. It just isn't possible that the floor joists were improperly installed without any stabilization.

I think it's funny how critical, opinionated, and adamant you guys can be. I can't see how anyone else out here makes a living doing anything that differs from your methods since you're all always right.
Slim,I gotta agree with ya====== this guy never gives advice--just lets all know how great he is--- I,m guessing he has a little weiner and needs to justify his manliness by taking jabs at everyone
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Old 11-13-2010, 05:37 PM   #17
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Re: Hairline cracks


Quote:
Originally Posted by SlimPickins View Post
Yeah, because he said that all basements have movement in the floor joists above. It just isn't possible that the floor joists were improperly installed without any stabilization.

I think it's funny how critical, opinionated, and adamant you guys can be. I can't see how anyone else out here makes a living doing anything that differs from your methods since you're all always right.
Well once you have run a million miles of tape and seen houses constructed over 25 years you kinda get to know how things work don't you think........

JS
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Old 11-13-2010, 05:43 PM   #18
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Re: Hairline cracks


Quote:
Originally Posted by DSJOHN View Post
Slim,I gotta agree with ya====== this guy never gives advice--just lets all know how great he is--- I,m guessing he has a little weiner and needs to justify his manliness by taking jabs at everyone
I work everyday, do you?

I don't have to convince anyone what I can do.

Also I'm not a little whiner and the advice I have given is from experience.
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Old 11-13-2010, 06:18 PM   #19
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Re: Hairline cracks


Realistically hairline cracks can be attributed to a few reasons. Joist Movement usually isn't the case unless they were not the proper size for the span. The most realistic cause would be the sheetrock was not fastened properly mixed with a poor hanging job where the seam wasn't tight and a poor taping job, If cracked throughout the basement I would think it was the taping job and perhaps the choice of material used, who knows for sure unless you rip the tape off and find out what is under it. We all know that sheetrock does have some flexibility to it and so does the joints to a certain point, then something has to give. I would think the load on the floor would have to be very great and it would have to be throughout for something like that to happen.
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Old 11-13-2010, 08:58 PM   #20
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Re: Hairline cracks


Quote:
Originally Posted by Mudstar View Post
I work everyday, do you?

I don't have to convince anyone what I can do.

Also I'm not a little whiner and the advice I have given is from experience.
First question----sounds like you have an inferiority complex----2nd question same thing--------3rd question you dont give advice--you give sarcasm as if you,re the only drywaller in the world. Heres a question for you----------When applying structo-lite plaster and it wont take up what would I do and use to help the problem before loosing the wall and mix??
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