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Old 11-11-2009, 09:38 AM   #1
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Can I tape joints on old masonite walls?


I just bought a house, it was built in 1954. They didn't use sheetrock & plaster, but instead used masonite.

All the trim has been painted over a million times, and I want to put in all new trim.

However, all internal & external corner seams use trim to hide the seams in the masonite.

I'd like to only install trim on the floors & ceilings, and tape & mud all the vertical corner seams.

Can I use drywall mud & tape on masonite, or will that just bubble & ruin the hardboard?

Pulling out all the masonite and putting up drywall is not an option.

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Old 11-11-2009, 10:02 PM   #2
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Can I tape joints on old masonite walls?


Post a picture of this.
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Old 11-12-2009, 06:30 AM   #3
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Can I tape joints on old masonite walls?


drywall tape will not work. the Masonite expands and contracts more than drywall and the seams will crack. Trim is the correct way to address these areas. Possible add more trim and create a decorative pattern like you had wainscoting.
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Old 11-12-2009, 06:37 AM   #4
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Can I tape joints on old masonite walls?


I have learned that what I have is not Masonite, but Homasote.

1/2" think, brown fiber board.
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Old 11-12-2009, 06:41 AM   #5
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Can I tape joints on old masonite walls?


You still can't tape it and mud it like you would drywall.
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Old 11-12-2009, 06:42 AM   #6
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Can I tape joints on old masonite walls?


just cover the room with 1/4" sheetrock and tape if you wish.
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Old 11-12-2009, 07:32 AM   #7
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Can I tape joints on old masonite walls?


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Originally Posted by Bob Mariani View Post
just cover the room with 1/4" sheetrock and tape if you wish.
I thought 3/8" was the thinest I could get?
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Old 11-12-2009, 09:05 AM   #8
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Can I tape joints on old masonite walls?


if you only buy from home owner box stores. any real supplier will have 1/4".... I even have some in stock.
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Old 11-12-2009, 09:16 PM   #9
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Can I tape joints on old masonite walls?


Yeah, the ceiling is drywall, only the walls are the Homasote crap...

I may just cover the walls with 1/4" drywall. If I can locate it at a lumber yard, otherwise just go with 3/8" from a Home Depot.
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Old 11-13-2009, 05:09 AM   #10
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Can I tape joints on old masonite walls?


you will also need to add box extensions on the electrical outlets. The code requires these to be flush for combustible surfaces and no more then 1/4" recess for non-combustible surfaces. So if using 3/4" rock you need to add these box extensions.

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