Here is how I plan to do it. Please give counsel or opinion good or bad.
We have been ask to put cement board directly over brick on two walls – a 8 x 10 exterior (good shape 12 in wall) and 6 x 8 adjacent interior brick wall. The brick are hard and solid – they just want smooth walls without the corrosive qualities of sheetrock (we’ll slick finish with thinset and fibreglas tape).
We plan to scratch and groove up the painted brick walls with a diamond blade. At this point we plan to apply a slurry of thinset with a brush to the brick.
The next step will be setting the cement board to the walls and holding with cement screws and washers – until the thinset sets up. This is a point I have been wondering about. Should I plan to recess and leave some cement screws? Thanks
Replies
Forget the durock. Just use a bonding agent and plaster.
We have been ask to put cement board directly over brick on two walls - a 8 x 10 exterior (good shape 12 in wall) and 6 x 8 adjacent interior brick wall.
I agree with the prior post about not using the backer board. However, you were asked to use the cement board and the HO is always right. I think I would use a screen mesh to adhere the thinset to the cement board though.. Just my thoughts...
GB
The backer board is a screen mesh on both sides. There is no use for a nother layer of glass, the thinset does the sticking.
You're right, I miss-typed. I didn't mean add the screen to the cement board, I was thinking not using the cb and applying thinset right to the brick wall with a screen as an added bonus. Sorry guys, and gals.
GB
Why not PL premium gobs and tapcons? keep it simple.
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RTangle grinder with dressing stone to face the walls to get to bonding masonary. If you must go to cb then lay it on the wall with 3/8s" or7/16s"notched trowel and thinset. If you lay up sleepers to force and hold you could eliminate the screws/tapcons, let cure for 24 hours. couple of tapcons and my new bosch 18v hd and you'd be done.
I really like that "sleepers" idea. That will both help line up the plane of the wall and save clamping fasteners. Thanks to all for the counsel
If you can use the opposite walls or the ceiling to wedge some jacks to push against and get the plane that you want with some fine tunning with shims. Take a look at the picture, same Idea just in this case it was sheetrock and foam.