Dumb drywall question

total newb said:
Not that youve ever noticed, but the new edges of a sheet of rock are slightly thinner than the body, thats why.

If you cut and place properly its what you want.
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**** Ive never known. Bet if I saw that, Id yell at the clouds for having **** quality uneven sheets
 
Clb said:
Tldr
Who posted the method of cutting out the skin/paper method?
Cut a 6" hole from say, a doorknob, cut patch out at 8", trim paper to float ?
If you don't know, don't ask:flipoff2:
It's not useful without a backer board...
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saw that plenty but raised same question if paper being over the other drywall. Guess I could try to peel old paper off the existing drywall to match thickness
 
fordguy said:
saw that plenty but raised same question if paper being over the other drywall. Guess I could try to peel old paper off the existing drywall to match thickness
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Eeh, glop some **** on the wall, make it smooth (not flat), and call it good. It's not CNC machining.
 
Lil'John said:
As others mentioned, construction is all about "magic" and fooling the eyes.

It is mind blowing for people who like "perfect". It drove me nuts when I was in actual construction. Paraphrase of convo:
"This isn't square"
"Come over here. What do you see?"
"Nothing"
"Exactly"
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If you build it right, you won't see anything either :stirthepot:
 
woods said:
Found this out doing my flooring. Son's room is something like 2" off square. That was brutal.
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My concrete slab for my shedmahol the concrete guy measured inside 2x4 form one side, and outside 2x4 the other side.
You couldn’t see it, until it mattered, by then I was ****ed.
 
grumpy356 said:
My concrete slab for my shedmahol the concrete guy measured inside 2x4 form one side, and outside 2x4 the other side.
You couldn’t see it, until it mattered, by then I was ****ed.
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thats a **** up. what happened then?
 
fordguy said:
saw that plenty but raised same question if paper being over the other drywall. Guess I could try to peel old paper off the existing drywall to match thickness
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You have to cut the paper off the existing wall so it sets flat...
 
Clb said:
Just got into it right...
Or do you move alot...:lmao:
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Eh? I've patched my fair share of drywall over the years, for myself and for friends...no issues skipping tape for patches.
 
grumpy356 said:
He came back out, squared it up, tied it back into the slab…. You can’t tell, and if you don’t know. They did the best that can be done, and I don’t think it’s going to crack.
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It'll crack. Thats what concrete does. It all cracks.
 
Stuck said:
It'll crack. Thats what concrete does. It all cracks.
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Less than a week after the pour of my shop.

I was bull****. Everyone i asked, "that happens and its normal ".
 
woods said:
Less than a week after the pour of my shop.

I was bull****. Everyone i asked, "that happens and its normal ".
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are they structural cracks or visual? do bridges and freeways crack? Not sure Ive noticed that
 
fordguy said:
are they structural cracks or visual? do bridges and freeways crack? Not sure Ive noticed that
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They do crack, but bridges are about 80% epoxy coated re-bar. So they monitor the cracks and make sure they're not structural.

Much less cracking when less water is used. Bridge decks are poured extremely dry, they have to keep watering to finish them.

There's also a massive difference in the strength and longevity when you pour a 6k psi engineered mix vs the 2.5k psi garbage they sell the average homeowner, because the cheap concrete guys doing resi work are using water instead of chemical to make it flow. So they're generally using the cheapest mix, over watering and reducing strength further, and then hoping it lasts the warranty period.
 
Chevy_man said:
They do crack, but bridges are about 80% epoxy coated re-bar. So they monitor the cracks and make sure they're not structural.

Much less cracking when less water is used. Bridge decks are poured extremely dry, they have to keep watering to finish them.

There's also a massive difference in the strength and longevity when you pour a 6k psi engineered mix vs the 2.5k psi garbage they sell the average homeowner, because the cheap concrete guys doing resi work are using water instead of chemical to make it flow. So they're generally using the cheapest mix, over watering and reducing strength further, and then hoping it lasts the warranty period.
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Doesnt matter, its concrete, it cracks. The ACI and PCI are all about cracks.
 
Stuck said:
Doesnt matter, its concrete, it cracks. The ACI and PCI are all about cracks.
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Yup, the difference is big infrastructure is engineered with this in mind and control the cracking....hence expansion joints and saw cuts and proper rebar schedules and all the rest of it.
 
fordguy said:
are they structural cracks or visual? do bridges and freeways crack? Not sure Ive noticed that
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1776720654531.png
 
How I patch

6" blade regular mud, put down a bed then a coat on top of the tape. Use hot mud for faster drying. After it dries , sand, then 12" trowel and top coat blended out. Before it dries hit it with damp large sponge, saves on sanding. Next texture, paint, and and done. I can generally do it in two coats.
 
Norm said:
How I patch

6" blade regular mud, put down a bed then a coat on top of the tape. Use hot mud for faster drying. After it dries , sand, then 12" trowel and top coat blended out. Before it dries hit it with damp large sponge, saves on sanding. Next texture, paint, and and done. I can generally do it in two coats.
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I had an a ss clown bid a job, he claimed he didn't have to sand...
Me
:lmao::lmao::lmao::lmao::lmao::homer:
GaBye
 
Clb said:
I had an a ss clown bid a job, he claimed he didn't have to sand...
Me
:lmao::lmao::lmao::lmao::lmao::homer:
GaBye
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The sponge trick cuts down sanding the topcoat by about 50%. On big jobs I wouldn’t do it, but on patch jobs it’s a lot less mess. I’ve fixed a lot of holes when I was doing rentals.
 
Good knife work is always great to see in a taper, that trick is a old goodie!
 
Chevy_man said:
Much less cracking when less water is used.
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yup
just like clay, lots of water makes for lots of shrinkage when it dries
it strikes me as odd that it doesn't just make like distributed voidspace (like air entrainment I guess), but the concrete actually shrinks even after it has cured for a week, with cracks forming only when it starts to dry out.

took a while to get the concrete place I use to understand what I wanted
"cram absolutely as much superplasticizer as you possibly can into the mix, then only add enough water for some zero slump curb work, we can always add some more when it shows up" seems to have been the magical phrase
 
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