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Posted by Al Bundy on August 13, 2006, 12:19 am
> The only problem with mud and wood is that they often don't adhere to
> each other and flakes of mud will drop off, or at minimum cracks can
> appear. I'm not saying that what will happen in your case, but in my
> experience this has happened. I recommend determining what thickness
> the plywood is, and if it's 3/8" or better, it may hold screws pretty
> well. Just make sure that you don't screw into pipes or electrical in
> the process. As mentioned lapping over the seams is a good idea, as
> the sheetrock can provided structural improvement too. In fact,
> keeping the plywood in place and sheetrocking over it will provide
> better structural strength, insulation, less moisture problems on the
> inside of the sheetrock, and better safety from fire.
>
> Al Bundy wrote:
>>
>> > Can anyone here help??
>> >
>> > I need a link or information that will guide me in installing
>> > sheetrock on the ceiling of a room I have enclosed. The problem is
>> > that there is already plywood on the ceiling and I don't plan on
>> > removing it. This was a carport that I have enclosed. Anyway, I
>> > understand about placement of sheetrock, but since the plywood is
>> > currently installed in the way that the sheetrock is supposed to be
>> > installed, do I follow the plywood, or do I put in the sheetrock in
>> > what I would call is perpendicular to the way the ceiling members
>> > run?
>> >
>> > The reason I do not want to remove the plywood is that there is
>> > blown in insulation in the attic which includes the part over the
>> > carport (now a new room)
>> >
>> >
>> > Thanks so much
>> >
>>
>>
>> Ran into your situation enclosed carport and all. Was gonna put
>> sheetrock over it. Then figured what the heck, try it.
>>
>> If nailed, go over with screws.
>> Ran belt sander over the plywood to smooth...50 or 80 grit.
>> Skimcoated ceiling with mud.
>> Ran a circ saw blade at all seams to give 1/8" expansion room.
>> Smoothed out mud and seam cuts by sanding.
>> Taped and mudded seams.
>> Smoothed out seams
>> Do a 2nd+ coat (whatever it takes) seam taper just like drywall.
>> Prime and painted with ceiling paint.
>>
>> Looked like a regular ceiling to me! Sold house 6mos later so I don't
>> know any long term results.
>>
>> A lot of the above steps you have to do with drywall anyway but at
>> least you don't have to buy & hang drywall...on a ceiling yet.
>
>
> ... mud and wood is that they often don't adhere to each other
Except when you don't want them to of course! :-)
> I'm not saying that what will happen in your case, but in my
> experience this has happened.
Like I said. Can't speak for long term results. Surly I won't argue that
putting the sheetrock over the plywood sounds like a better approach.
> I recommend determining what thickness
> the plywood is, and if it's 3/8" or better, it may hold screws pretty
> well. J
Hopefully can layout the sheetrock so that edges of existing plywood are
in the field of the sheetrock.
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