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Mating MDF with Drywall?

John-Boy's picture

I'm trying to provide adequate support in a drywall ceiling (steel stud bulkhead) for a glass door pivot hinge.  The glass is to be flush with the face of the bulkhead (right on the corner bead...), but I have to put some sort of structural support in with limited invasion.  My thought is to use MDF, cut it in to the drywall and re-tape/mud the works, repaint, etc.


Will the MDF constantly crack the taped & mudded joint?  Any other ideas?


John-Boy

(post #100436, reply #1 of 8)

I'm thinking you're going to have a problem with the MDF expanding when you introduce the wet mud into the equation.


How about a piece of 1x6 wood or maybe even an aluminum strip?

 

Family.....They're always there when they need you.

(post #100436, reply #2 of 8)

I have used MDO (not MDF) for making a small boxbeam over a retrofitted opening, like widening a doorway or cutting in a closet in an existing wall.  I use 1/2" MDO in the same plane as drywall and flat tape it.  That's the nice thing about MDO, you get the structural properties of plywood with a paper face that paints out just like drywall.


MDF might work, but it's a pain to work with and as you know most grades are sensitive to moisture.  Then there's the issue of the surface being a different consistancy than drywall...try some MDO, I bet you'll come out grinnin'.


TIPI,TIPI,TIPI!

(post #100436, reply #3 of 8)

Is MDO an exterior grade plywood, like paper face form-ply? Medex is an exterior grade MDF that might take care of the moisture problem.
I think that MDF, with it's edge well sealed and face primed, would be fine with the tape and mud joint. The different surface textures is a problem, but no more than the plaster and dywall paper difference. With a couple of heavy coats of primer and paint, it will work fine.

(post #100436, reply #4 of 8)

"
 

"Is MDO an exterior grade plywood, like paper face form-ply?"


Yes. In fact, I'm pretty sure form-ply is sometimes called HDO (heavy density overlay).  The MDO we get out here in Western Washington has a pale green paper face.  People use it for outdoor signage.  Tapes and paints out just like drywall.  Very versitile product.


TIPI,TIPI,TIPI!

(post #100436, reply #5 of 8)

Man Jim--saw the post header and thought--Hey this guy needs MDO and ya beat me to it---

The only thing I can add is that I found if you primed the MDO first it seem to take better to being taped--the paper must be enough different (less poreies Im thinking ) that the mud set up different the first time I used MDO--Prepriming seemed to gve it more tooth--if that makes any sense

Have used MDO to box out window in basement that are being taped to the wall rock and it holds up way better that DW--at least near windows.

Hope things are well with you and Cathy--till next time.

Mike

" I reject your reality and substitute my own"
Adam Savage---Mythbusters

Mike "Even a blind squirrel finds a nut once in a while" Mitremike c. 1990 " I reject your reality and substitute my own" Adam Savage---Mythbusters

(post #100436, reply #6 of 8)

One of these days I am going to find a use for that hunk of laminate---(smile)

Mike

" I reject your reality and substitute my own"
Adam Savage---Mythbusters

Mike "Even a blind squirrel finds a nut once in a while" Mitremike c. 1990 " I reject your reality and substitute my own" Adam Savage---Mythbusters

(post #100436, reply #8 of 8)

Well, if you do find a use for it let me know.  I have a bunch of them!


Nice to see you around, Mike.  See you this summer, huh?


p.s. been meaning to tell you I liked your new card.


TIPI,TIPI,TIPI!

(post #100436, reply #7 of 8)

Been there, done that. I have just primed the edges and surfaces with BIN 123, then taped away. So far so good. But it's just one example.

Jake Gulick


Lateapex911@optonline.net


CarriageHouse Design


Black Rock, CT

Jake Gulick

Lateapex911@optonline.net

CarriageHouse Design

Black Rock, CT