Quote:
Originally Posted by look 171
1/2" back board is used to match the exact thickness of adjacent drywall to create a flush transition. This is where backer boards are screwed direly onto bare stud walls. We don't use too much 1/4" due to it flexing too much. I like the solid thud when you go inside to wash up and punch the wall after half day of swearing, trying get that water pump off your car 
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Got it...didn't realize you were screwing directly to the studs.
What's a water pump

?