Curing/drying time??

 
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Old 07-25-2010, 10:21 PM   #1
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Curing/drying time??


Just wondering what people think about drying times of compounds, Ever noticed the tapered edge line showing through after a few months later under some down lights mounted to the wall??

I have a feeling it takes 30 days or so to fully cure and stop shrinking, depending on how thinned it is and type of mud of course.

What about the wall board, if its made a week before its hung and taped is this still curing?? Our board seems to be getting quite soft.


Last edited by cazna; 07-26-2010 at 03:02 AM.
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Old 07-25-2010, 10:53 PM   #2
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Re: Curing/drying time??


On walls or lids where lighting was a possible issue I always went overboard hitting the first coat with a hotmud/plaster of paris mix and then skimmed everything out by hand real wide with AP then Sof Top (Hamiltons). Always turned out well but took a lot more time to do.

Looking forward to what other guys think about this...
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Old 07-25-2010, 11:32 PM   #3
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Re: Curing/drying time??


your dead on the money with curing,drywall the most important to be dry,good builders in our area use electric heat (driest heat) and dehumidifiers even in the summer (very humid here) as soon as they start hanging.mud shrinks tiny bit ,heard it takes 3 months to cure.hot muds worst ,sure they set in 20 minutes or so but take years to cure ,done warranty work before (20 years ago)where you go back to a house one year later,the hot mud (sheetrock)would shrink on the flats leaving a line to fill,and you could see the holes on the metal bead ,that bad!!
drywall most Important though,here's one story why!!!!!
15 years ago did a house in Sarnia (contracted it),kept telling the builder to give me heat in basement or dehumidifier (not my job to control the environment or weather) ,mister builder cheap and it's raining most of the week.Finish job.One week later calls me and sayz there's a butt in ceiling in basement that needs fixing(there's that i don't make money word {fix})turns out every joint and screw in basement needs another coat,you can see the tape,BUT upstairs every thing perfect (of coarse) he sayz I cheated on the coating in basement,try explaining the upstairs was more ventilated and drywall was dry while basement was not (plus bricky was using a big fan while working on fire place,which helps)He knew I was right ,even home owner knew too,but tells me to fix it or i wont work for him again,i choose not to (surprize you cazna) he's long gone ,I'm still working !
wet drywall affects curing of muds the most,other things like truss lift,studs shrinking,house settling,bad hanging jobs make our jobs look like **** too !
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Old 07-26-2010, 02:58 AM   #4
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Re: Curing/drying time??


Thanks for that guys, it reasures me a bit, heres why i started this post.

The house im on i have taped the joins with sheetrock taping compound, then boxed it with a 10 then 12 using sheetrock total, sanded, then rolled and hand skimmed the walls and ceilings twice, radius 360 hand sanded it all down smooth as glass under twin 500watt halogens.

Painters have done there bit, electricans have fitted out the hallway with wall lights that shine up and down the walls. everything was looking great i was feeling so proud i felt it was my best work i could possiably do.

Anyway this house has concrete floor with water pipes and a big heat pump to heat the water to heat the floor and so on.
They have fired this up and warmed the house up and now in the hallway under the wall light you can see the line of the tape

Devistated would be an under statement, im gutted, your replys have confermed my thought, its shrunk back into the taper, after all that work this happens

We dont use heaters or dehumids here, no one has them and it costs a lot hire.

So how can i get a perfect level 5 finish then, i thought i had it sorted but it needs ages to dry, this house has been built fast, the owners sold there last place and have demanded a date to move in.

The things against me have been the rush, weathers been around 8 degrees which is not to bad, those wall lights and the wall paint is a little on the shiny side, if it had different lights and a less shiny paint it would look a lot better, but it dosent.

Im plastering and painting out my next house and thankfully its smaller, they are having hanging lights and wall lights and its a house on a hill that gets bombed with sun, i dont want this to happen again

Been at it for 13 years had the add join do this but its been in areas that has not been a concern, these new wall lights are becoming popular, and people are expecting perfect walls more now, its a bit unrealistic givin these things can happen to you.

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Old 07-26-2010, 09:51 PM   #5
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Re: Curing/drying time??


man, I can tell your a contractor that really cares,here's a few things that might help from a old fart that use to contract (now I sub)
- your mud boxes should state minimum temperature to work with,ours say 10 c,recommended 20 c or 60 f, I know ,they still may not supply heat etc... But you warned them (makes you feel little bit better if the sh*t hits the fan.
-to know for sure the drywall was moist when you taped it, and it dried out when they turned the heat on,push on the screws a bit,if they move then drywall was too moist,or if it looks like they need another coat is evidence too.
if it just looks like your joints are affected, quit using sheet rock,not joking ,sheet rock has it purposes but not for prefilling.
-prefill with straight stiff mud if you can,if you half to push use durabond instead ,it cures faster and forces that flat tape to dry quicker if you want to coat it the same day.Or try plaster of paris/lime, mix it with your mud,turns it pink and you have 5 minutes to get it on the wall ,(just for those small jobs)
-If your a hawk and trowel guy you can try veneer plaster for those small jobs ,but its weather sensitive http://www.bobvila.com/HowTo_Library...lls-A1484.html
sounds like your doing perfect work,you might half to invest in some heaters or fans,average temperature of 8 c is what got you on this job,and dont use propane heat either ,should be a warning on your mud boxes about that too.
bottom line sounds like you did nothing wrong,just that word sheet rock scares me(need lots of heat when using it),I got horror stories from using that stuff
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Old 07-26-2010, 10:16 PM   #6
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Re: Curing/drying time??


I was a hawk and trowel guy for 10 years using hot mud for first two coats then all purpose for the final, but got tired of pushing it all by hand so started on the auto tools a few years ago.

Tryed the ES210, figured i could tape up with that but it was a hassel, one day it set after 90min solid in 2min flat, i had no time to get it out of my tools and it set solid, try getting that out of a gooseneck.

So then came the pemix stuff, tryed most of the sheetrock now, really liked the taping compound, runs and tapes up very well and the total boxes well, and its nice to sand.

I have noticed this shrinking before but this is just a bad one, to cold, house built to fast, plastered then painted then heated and wall lights, and the house is getting shaking up by vibrating rollers in the drive and the section next door getting preped up with diggers trucks and rollers.

Your heard some not good stuff about sheetrock?? like what??
We have not much choice here for compounds, Sheetrock, Hamiltions,Gib thats about it, Gib is the local made stuff and is hopeless for auto tools and cost more than the others, we have easy finish which seems to get a bad rap but it seems ok to me.

We have one type of wallboard which is made here called Gib, but some Knaf and baier seems to be showing up but ony in 1200mmx2400mm.

Its crazy, the board is made then stacked then sent to the hardware stores, kept in cold storage areas, then of to the job then hung which is the first time it gets any air around it and it might only be a week old, then i had to plasterer straight away, then paint, its a wonder it dosnt play up more, the timber frame is still moving and drying and we are expected to produce perfect walls, Huh, Yeah right.
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Old 07-26-2010, 10:37 PM   #7
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Re: Curing/drying time??


Quote:
Originally Posted by cazna View Post
I was a hawk and trowel guy for 10 years using hot mud for first two coats then all purpose for the final, but got tired of pushing it all by hand so started on the auto tools a few years ago.

Tryed the ES210, figured i could tape up with that but it was a hassel, one day it set after 90min solid in 2min flat, i had no time to get it out of my tools and it set solid, try getting that out of a gooseneck.

So then came the pemix stuff, tryed most of the sheetrock now, really liked the taping compound, runs and tapes up very well and the total boxes well, and its nice to sand.

I have noticed this shrinking before but this is just a bad one, to cold, house built to fast, plastered then painted then heated and wall lights, and the house is getting shaking up by vibrating rollers in the drive and the section next door getting preped up with diggers trucks and rollers.

Your heard some not good stuff about sheetrock?? like what??
We have not much choice here for compounds, Sheetrock, Hamiltions,Gib thats about it, Gib is the local made stuff and is hopeless for auto tools and cost more than the others, we have easy finish which seems to get a bad rap but it seems ok to me.

We have one type of wallboard which is made here called Gib, but some Knaf and baier seems to be showing up but ony in 1200mmx2400mm.

Its crazy, the board is made then stacked then sent to the hardware stores, kept in cold storage areas, then of to the job then hung which is the first time it gets any air around it and it might only be a week old, then i had to plasterer straight away, then paint, its a wonder it dosnt play up more, the timber frame is still moving and drying and we are expected to produce perfect walls, Huh, Yeah right.
Man, your beating yourself up too much.

You got remember that enough light thrown at a wall will show some stuff.

We are finishing drywall, not painting cars.
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Old 07-26-2010, 10:41 PM   #8
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Re: Curing/drying time??


the only good thing I hear about sheet rock is................................................ ...I cant think of nothing
I sorta remember you saying you deal with a small town,Im starting to see a pattern that the smaller the population base a taper deals with the more head aches they get,the larger the population base less head aches ,guys talk of sub contracting,union work and cool tools and materials to deal with,here in Ontario lots of land and population,just a theory mind you ?
now I half to google map New Zealand ,see what your dealing with there
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Old 07-26-2010, 10:53 PM   #9
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Re: Curing/drying time??


I am in a small town, and your right, I think in citys there is less accountablity for what you do and in smaller areas most people know someone who knows someone.

something up and the whole town knows.

Maybe i am beating myself up capt but to do better and figure stuff out is what gets me out of bed, I just enjoy the challange.

And i think you would find if you came here we and behind the times 2buck, McDusty who posts on here moved from canada to here found it all a bit backwards, i think hes fled back to canada now.

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Old 07-26-2010, 11:12 PM   #10
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Re: Curing/drying time??


Quote:
Originally Posted by Capt-sheetrock View Post
Man, your beating yourself up too much.

You got remember that enough light thrown at a wall will show some stuff.

We are finishing drywall, not painting cars.
half to agree with capt,old time taper asked me when I was 1st starting "do you try and do your best and make every job PERFECT" I said "YES" then he said "then your in the wrong business,go get a easel and be a artist" went on to say if your doing that perfect job and the JERK don't pay ,you could of been in your next house by now making up for your losses
you half to be a dry wall whore, make the CUSTOMER happy ,not you,
So think like a hooker ,do what you got to do to make them happy ,then get their money
I'm a high priced one by the way
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