Been reading a ton but could not find this info...
I have RC on the walls and have everything marked so as to know where the RC is and to not hit any studs with the screws etc. But I noticed that the drywall screws (standard coarse) have a hard time going through the metal RC. Should I pre-drill? The screw spins quite a bit before it finally grabs so the drywall will be reamed by the time the screw goes through the metal RC. Should I be using a different screw? If so which one? I did see the post about using the fine thread drywall screws for the ceiling and this implies that the drywall screws I have are correct. But I wanted to make sure.
Also I am not a contractor and don't know the drywall "tricks"... is there an easy "trick" for cutting out the receptacle holes? Other then measuring for each and every one?
thanks... jam
drywall RC install questions
Originally posted at johnlsayers.com, topic 9353.
Jam, You have to use drywall screws made for metal studs - not wood studs - and be careful - they aren't metal just because they are fine thread - they make a fine and coarse thread for both metal and wood......... predrilling is insane.........Been reading a ton but could not find this info... I have RC on the walls and have everything marked so as to know where the RC is and to not hit any studs with the screws etc. But I noticed that the drywall screws (standard coarse) have a hard time going through the metal RC. Should I pre-drill? The screw spins quite a bit before it finally grabs so the drywall will be reamed by the time the screw goes through the metal RC. Should I be using a different screw? If so which one? I did see the post about using the fine thread drywall screws for the ceiling and this implies that the drywall screws I have are correct. But I wanted to make sure.
If you pick up a drywall router - you can always get a rough measurement for the iside of the box - and just hang the sheets - maring out the inside of the box on the front - a little circle would be fne - The you go back (before backscrewing all of the drywall) and use the router to plunge into the center of the box - go to an edge and then verycarefully go out to the box face and cross over to the outside of the box........... you then just route around the box outside............ Very easy compared to precutting the boxes.......... BUT - it's more difficult than it sounds to get a perfect cutout with the router - it walks way from the boxes real quick and easy if you let your guard down........... RodAlso I am not a contractor and don't know the drywall "tricks"... is there an easy "trick" for cutting out the receptacle holes? Other then measuring for each and every one?
I just crossed this same bridge...
I bought a drywall book to aid in my horrible drywalling skills, and found out that there are indeed type "W" (wood) and type "S" (sheet metal) drywall screws. The type S screws worked perfectly on my RC.
Mine have a finer thread, but also have a different tip that more easily punctures the RC.
Good luck!
Thank you both. I would have figured it out eventually, but now I have the correct screws and am just about to start slapping the drywall up.
Another dumb question... On the second sheet of drywall... do the screws need to also penatrate the rc channel? If so what size screw to go through two 5/8 sheets into RC? Actually what size for the second sheet either way? I thought i saw a post about screw schedule but can not seem to find it now.
thanks again... jim
This is an interesting question that I would like to see answered as well. In my drywall book, they have a small section on hanging with RC, and they suggest that the second layer only needs to be screwed in the first layer of drywall, and *not* into the RC. I think they are nuts!
In my case, I have the RC on the ceiling, so it is not even a question! I am planning on screwing the second layer into the RC as well.
I bought 2.5" screws for the second layer (1 5/8" of drywall, plus another inch to penetrate the RC).
No thoughts/advice on screwing the second sheet of drywall? Into RC or not? Would there be a difference of where/how many, if I used Green Glue as opposed to no green glue?
thanks... jam
You can take a look at this and come to your own conclusion:
http://www.asc-soundproof.com/isodamp-install.pdf
The weight of the board needs more support then just a screw into more rock as you both have realized. More so when the two are glued together in any fashion, then you have the weight of both supported by the screws of one!
Thanks,
Brien
Jam, first off - whoever wrote the book is nuts - the drywall has to be fastened- the only drywall book worth owwning is free and it's the USG manual..... they make the material - put it in like they want. Next - GREEN GLUE IS NOT GLUE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! So how could it possibly make a difference? Please do some research before making comments like that - that is one of the ways that misinformation n the internet happens - a google search doesn't know right answers from wrong answers - - it only knows what has been posted.......... that is what will pop up in a search - and then someone might see your posts before anything else - and report that as gospel - and so on and so forth........... Sincerely, RodNo thoughts/advice on screwing the second sheet of drywall? Into RC or not? Would there be a difference of where/how many, if I used Green Glue as opposed to no green glue? thanks... jam
Rod... What?... I was asking for help here, NOT giving advice... (?) at end of my sentences. It seemed clear enough to me... but sorry for the confusion. Oh and yes I do understand the green glue is NOT glue, but thanks anyway. By the way what book are you talking about? Are referring to the link from xspace's post?
Also thanks Xspace.. that was the info I needed! I figured that it would be best to screw into the RC with the second sheet of drywall.
jam
Jam, first off - whoever wrote the book is nuts - the drywall has to be fastened- the only drywall book worth owwning is free and it's the USG manual..... they make the material - put it in like they want. Next - GREEN GLUE IS NOT GLUE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! So how could it possibly make a difference? Please do some research before making comments like that - that is one of the ways that misinformation n the internet happens - a google search doesn't know right answers from wrong answers - - it only knows what has been posted.......... that is what will pop up in a search - and then someone might see your posts before anything else - and report that as gospel - and so on and so forth........... Sincerely, RodNo thoughts/advice on screwing the second sheet of drywall? Into RC or not? Would there be a difference of where/how many, if I used Green Glue as opposed to no green glue? thanks... jam
I think he might be referring to the drywall book that I mentioned in my post, however I was also quick to point out that I thought that they were nuts!
I was drinking when I read it so I thought it was just me.
Brien
That's my interpretation as well. Boy... A statement like that (in the book, to attach a second sheet of drywall only to the first sheet of drywall) sure makes me want to question everything else in that book! --Keith :mrgreen:I think he might be referring to the drywall book that I mentioned in my post, however I was also quick to point out that I thought that they were nuts!
Ok... another RC install question that i can not find an answer to.
I have a header that is about 5-6 feet long and 12+ inchs high just below the two top plates along one wall. The RC is supposed to be plaed 6in from the ceiiling. I can not figure out how I am to screw the drywall into the RC and not touch the solid header behind. The only thing I can think of is using a screw that is one inch long so that it goes through the 5/8 drywall and then the RC without touching the header behind.
What are your thoughts?
jam
Jam, Not a problem as long as you do this: Put up a full sheet that spans the door header and install it using standard penetration screws - then cut out the door - and then the short screws to finish up the header - and you'll only need a few along the perimiter. BTW - I never hold the RC 6" below the ceiling - perhaps 1" or so below the bottom sheet on the ceiling - but never 6". I know that's not in keeping with USG - but it's a cleaner installation. RodOk... another RC install question that i can not find an answer to. I have a header that is about 5-6 feet long and 12+ inchs high just below the two top plates along one wall. The RC is supposed to be plaed 6in from the ceiiling. I can not figure out how I am to screw the drywall into the RC and not touch the solid header behind. The only thing I can think of is using a screw that is one inch long so that it goes through the 5/8 drywall and then the RC without touching the header behind. What are your thoughts?
Thanks! Ok.. so Rod... am I understanding you, that where-ever the headers are I should use the short screws, and use the regular screws everywhere else. I am really concerned about touching the header with the screw. I am putting up 5/8" drywall and the rc stands "about" a 1/2" off the header. What length fine thread self-tapping drywall screw should I use? Do they make a 7/8" metal stud drywall screw? An inch long screw seams very close to touching the header in my application?
Also thanks for the RC tip I will place them closer then 6". I don't see how you can place them one inch off the top/bottom of the wall without nailing directly into the top plate/bottom sill and basically beaning in the same boat as I am in with the headers... IE having a solid piece of wood under the whole length of the RC.
jam
Jam, Not a problem as long as you do this: Put up a full sheet that spans the door header and install it using standard penetration screws - then cut out the door - and then the short screws to finish up the header - and you'll only need a few along the perimiter. BTW - I never hold the RC 6" below the ceiling - perhaps 1" or so below the bottom sheet on the ceiling - but never 6". I know that's not in keeping with USG - but it's a cleaner installation. RodOk... another RC install question that i can not find an answer to. I have a header that is about 5-6 feet long and 12+ inchs high just below the two top plates along one wall. The RC is supposed to be plaed 6in from the ceiiling. I can not figure out how I am to screw the drywall into the RC and not touch the solid header behind. The only thing I can think of is using a screw that is one inch long so that it goes through the 5/8 drywall and then the RC without touching the header behind. What are your thoughts?
Jam,
they make those screws in any length you need- i would use 7/8" for my first layer - and 1 1/2" for my 2nd.
Rod
I have been looking for hours and can only find 1 inch. Could you point me where you get 7/8" I was very concerned about using 1"
thanks,
jam
Jam, they make those screws in any length you need- i would use 7/8" for my first layer - and 1 1/2" for my 2nd. Rod