08:48AM | 02/05/05
Member Since: 07/30/04
11 lifetime posts
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.


12:29PM | 10/31/05
Member Since: 10/30/05
9 lifetime posts
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.


12:52PM | 10/31/05
Member Since: 07/03/05
283 lifetime posts
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.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

All bookworms need a good bookmark that inspires them to keep reading. To make this colorful bookmark, cut a rectangular p... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon