We just removed the old floor from our bathroom. My husband is going to put down 3/4" plywood and then 1/4" Hardibacker on top of that. Is it okay to use pre-mixed thinset mortar to set the Hardibacker on top of the plywood?
Also, do you use a square-notched 1/4" trowel to apply the thinset?
Thanks a bunch!
PS... I don't know if it matters, but we're going to put tile on top of the Hardibacker.
the premixed thinset mortar should work fine, but also use hardibacker screws as well. i'd say one screw about every 8-12 inches in both directions. you do want to use the square-notched 1/4" trowel as well, just be sure to put the thinset on evenly.
STOP!!! DO NOT USE THE PREMIX STUFF. It is junk to begin with, it takes forever to dry and it will compress. Use a thinset that comes in a bag, you mix it with water. This will cover your warranty with Hardie, premix will not. You can use the cheap unmodified thinset or a modified thinset. The primary reason for the thinset being under the Hardiebacker is not to bond so much as it is to fill in any hollow spots that may compress under weight. That is one of the main culprits that will cause your tiles to come loose or crack. You can use backerboard screws or 1& 1/4" galvanized roofing nails to anchor the board to the plywood. Also tape the seams with mesh tape and flash coat with the modified thinset you will use to set your tiles. The plywood seams should be gapped at 1/8" and should be filled with a cheap latex caulk before putting down the Hardiebacker. This will allow the plywood to expand without buckling as long as it is not tight to the walls, should be a 1/4" gap there left open or caulked, but no thinset in that gap either.
- 15 Old House Features We Shouldn't Abandon
- 17 Tiny Bathrooms We Love
- Make Your Bed: 9 DIY Headboards
- Insanely Easy 60-Minute Home Improvements
- Space-Saving Solutions for Tiny Bedrooms
- 9 Perfect Color Combos for Your Home
- 22 Tiny Houses We Love
- See the Most Highly Anticipated Colors for 2015
- What's the Best Color for Living Rooms?
- Favorite Space-Saving Double-Duty Furniture
- 10 Low-Cost DIY Home Security Solutions
- Redecorate Without Spending a Dime: 10 Ideas
- 10 Houseplants You Can Grow Anywhere
- 9 Amazing Mobile Home Makeovers
- 10 Doable Designs for a DIY Rug
- 9 Alternative Uses for Toothpaste
- Live Large in a (Very) Small Space
- 8 Cheap and Unique DIY Nightstands
- 15 Eye-Catching Options for Your Front Door
- Supersize Your Small Bath with 8 Pro Tips
- Don't Try This at Home: 7 Dangerous DIYs
- 10 Simple Woodworking Projects
- Is There Anything Vinegar Can't Do?
- 7 Incredible Uses for Salvaged Lumber
- 12 Tiny Gardens You Can Grow on a Tabletop
- 16 Sneaky Storage Ideas
- 10 Surprisingly Smart Solutions for Junk Drawers
- Bright & Bold Colors for Your Front Door
- DIY Bookcases: 16 Easy Project Ideas
- Don't Make These 7 Fireplace Mistakes