Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where. So you may need modified under your Ditra and unmodified over it. as I recal, you want modified between ditra and a wood underlayment, and unmod over the hardie or between tile and the Ditra. The type of thinset used with it varies according to the substrate you are going over. But they require that they dry also instead of just curing.When you use Ditra, read the instructions carefully. There are another step up in stickiness also to adhere to some surfaces and they retain moisture in the mix for when the surface used is porous in such a degree that it can suck water out of the mix before it cures. Normally, dry times range from 12 to 24 hours. Drying times vary based on the type of mortar you will use for the tile. In order to provide a consistent surface layer for the tile, fill the seams of the backer board with the tile mortar and let it dry. The modifiers makes it more tolerant of movement and freezing, etc. The Hardie board is set into this mortar while it is still wet and nailed into the sub flooring. As mentioned before, the thinset fills the small gaps between plywood and cement board. You need near 100 contact between the hardibacker and the underlying plywood, or the hardibacker will flex and cause your tiles to pop or crack. Modified has altex modifiers added that changes the way it works. You don't want to use construction adhesive. Unmodified is a setting type material like mortar and concrete and grout. Sometimes they are interchangeable in use and sometimes not. In the genre of thinset, there is modified and unmodified thinset. That is verse a wet set installation where tile is directly placed on a wet mortar bed.Standard installation for hardy backer is a bed of thinset frp, 1/4' square notch trowel. That is the old way of doing tile and can be done in one day for a small enough area with enough skill and experience.I am not just going into this to be picky.It is because now that you mention Ditra, it is important for you to understand all these differences. Dry set mortar is simplely thinset.It is called dry set because it is used to set tile on a DRY substrate. In tile work, it would be more like a 1-1/2" mortar bed. They use a finer agregatebut when you just say mortar, it is portland and fine aggregate, probably with masonry lime and is used in minimum thicknesses of 3/8". They have additives to make them workable and to set up faster and/or to have more stickiness. Thinset mortar and dryset mortar are the same thing. Thinset and mortar are not the same thing for this purpose or any other.
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