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Old 07-31-2018, 12:02 AM   #1
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No wooden studs behind plaster wall


Our bathroom condo was original from the 60’s. The walls were plaster on mesh. All 4 walls had tiles at least 60% up the walls. We had all tiles and walls demolished down to the frame. The idea was to add in new drywall/backerboard to the wooden studs.

After the demo we saw that 2 out of the 4 walls don’t have wooden studs and have a metal “grid” instead where the mesh was attached to.

The wooden “frame” in the photos was behind a medicine caninet mirror.

How do we add drywall to the walls without wooden studs?

Thank you
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Old 07-31-2018, 12:13 AM   #2
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Re: No wooden studs behind plaster wall


Hard to know something that stood for 60 years. space saving a fire proof.
I would just strap it with 1x4 and carry on.
Cut chunks of 2x4 with a slot in them so they fit around the pipe from the back and screw the strapping to them.
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Old 07-31-2018, 08:21 AM   #3
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Re: No wooden studs behind plaster wall


What you have is Cold rolled channel iron wire tied. I can't tell from the photo's it may be 1 1/2 inch carrying channel with 3/4 inch runners.
How is it supported at the top & bottom if it has the channel track than remove the horizonal channels , it may also have what they call shoes & than wire tie furring channel to the remaining vertical channels ( Hat Track ) the furring channels come 1/2" - 7/8" & 1 " see if you can find the 1/2 inch it may very well match the original depth of the plaster than you will have to use the proper drywall to match the tile depth.

Contact a good commercial metal framer in your area they should be able to give some more advice.
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Old 07-31-2018, 08:33 AM   #4
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Re: No wooden studs behind plaster wall


I just picked up something you have what is known as a ROCK LATH support system this may change how the wall is attached at the top & bottom.
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Old 08-06-2018, 05:33 PM   #5
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Re: No wooden studs behind plaster wall


that sure doesnt look like rocklath to me....
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Old 08-06-2018, 05:39 PM   #6
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Re: No wooden studs behind plaster wall



https://inspectapedia.com/interiors/...Metal_Lath.php
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Old 08-06-2018, 06:58 PM   #7
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Re: No wooden studs behind plaster wall


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that sure doesnt look like rocklath to me....
If it is not RocK LATH how do you explain the metal Clip at the joint holding the sheathing to the channel Iron ? Also note the size of the Rock Lath Joints 16 inches X 48 inches.
The side with the metal lath & plaster is High Rib Lath with a base coat of cement plaster a tile bed coat plus tile. My estimate is that the plaster is 3/4 inch plus the bed coat plus tile = 1 & 1/4 inches thickness. Have installed many systems like this.

NEALTW your illustration is a suspended metal lath ceiling system very commend in a plaster system but not related to the Rock Lath system.
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Old 08-06-2018, 08:55 PM   #8
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Re: No wooden studs behind plaster wall


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Originally Posted by ClarenceBauer View Post
If it is not RocK LATH how do you explain the metal Clip at the joint holding the sheathing to the channel Iron ? Also note the size of the Rock Lath Joints 16 inches X 48 inches.
The side with the metal lath & plaster is High Rib Lath with a base coat of cement plaster a tile bed coat plus tile. My estimate is that the plaster is 3/4 inch plus the bed coat plus tile = 1 & 1/4 inches thickness. Have installed many systems like this.

NEALTW your illustration is a suspended metal lath ceiling system very commend in a plaster system but not related to the Rock Lath system.
I must be blind... theres a wall behind the one removed with what looks like rock lath, but I am not seeing it in this bathroom...

And in the house I grew up we had 2 suspended metal lath ceilings, one 14x14 and the other 14x18.... both installed by my grand father and dad.
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Old 08-06-2018, 09:54 PM   #9
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Re: No wooden studs behind plaster wall


Quote:
Originally Posted by That Guy View Post
I must be blind... theres a wall behind the one removed with what looks like rock lath, but I am not seeing it in this bathroom...

And in the house I grew up we had 2 suspended metal lath ceilings, one 14x14 and the other 14x18.... both installed by my grand father and dad.
What is supporting the Rock Lath sheathing behind the metal lath & plaster you see ?
Than answer the OP question as to WHY no wood STUDS ?
Now explain what is supporting the Cement plaster & Tile ?
I stated that it is a metal support system as you can find in the USG hand book dated P-15 USG Rev. 5/64. & you can find the CLIP I asked about on page 29 of the same book. The clip is " TL-1 TRUS-LOK FIELD CLIP " it is a clip specially formed & designed to provide a rigid attachment of 3/8" ROCKLATH plaster base to TRUSSSTELL studs. Can YOU give an answer as to how the sheathing behind the Tile & plaster is supported & also what is holding up the plaster & tile ? I can STATE that the metal GRID system is supporting both wall substrates up. If you need the info from the USG booklet that I have in front of me I can tell you that there are 26 different clips that could be included it that metal support system & you can find them on page 26 , 27 , 28 & 29 of the above USG HAND BOOK. As for a metal supported plaster grid system in stalled I can STATE that the last one of many that I installed was in 2011 in a Banks parking garage. Also I have installed many supported walls as you see in the OP's questions.
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