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I am installing backer board in my shower and tub area and on a few walls in the bathroom. I am trying to save money and not going down to the studs on half the areas. How can i transition it to the 1" plaster walls. Can I double up two 1/2" backers. Could I usd plywood then backer on top of that?
 

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All you need is 1/2" shims on the studs. Strips or OSB or plywood will work fine.
 

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I am installing backer board in my shower and tub area and on a few walls in the bathroom. I am trying to save money and not going down to the studs on half the areas. How can i transition it to the 1" plaster walls. Can I double up two 1/2" backers. Could I usd plywood then backer on top of that?

Maybe post a picture. How do you plan to waterproof these walls? Why would you be going down to the studs in "half" the area?
 

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only half

I am only goingdown to studs because there is too much wall I do not want to replace. I am going to use 15 lb felt then backerboard.
 

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I am only goingdown to studs because there is too much wall I do not want to replace. I am going to use 15 lb felt then backerboard.

You could use furring strips to build the backer out. Do not use plywood. You may get lucky and find some pre cut stuff that will build you out to the correct thickness. Personally, I would just take it all to the studs. At least the walls that your tile would be meeting. Drywall isn't expensive and the cost of the furring strips and the labor involved in installing them behind backboard would be well worth it in my opinion.
 
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